What would cause a torque converter not to lock up. It could be related to your ABS light if your speedo or an abs sensor is completely haywire. Allison 1000M torque converter lock and unlock Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. Thanks. It transfers rotating power from the combustion engine to the load. If you can find someone with AE or datalogging software to watch the slippage and TC modulated/lock and then you can tell if it is actually slipping. Mar 29, 2024 · What is a Torque Converter? Before we get into the nitty-gritty, you might want to know what a torque converter is. May 27, 2019 · C4 Tech/Performance - Torque Converter will not lock up. Any help appreciated. Was refusing to lock up for the last couple weeks, causing high trans temps. When I come to a stop it lugs hard and drops the rpms to about 300 and then something releases and its ok until I go again. This same cycle will happen until I get the 2 to 3 miles on it, like mentioned above. I have an 02 2wd with a 7. They know this because of higher RPM at a given cruise speed also if they accelerate hard if feels like the transmission is slipping. Worked great last year - 40+ hooks to the sled Jan 2, 2020 · I have found that the torque converter is not locking up on the highway but the trans is going into overdrive and shifting into 4th gear. Dec 13, 2023 · The Purpose of Converter Lock-Up Understanding the purpose of a locking-up torque converter is essential. Mar 10, 2015 · I recently replaced my transmission due my bell housing cracked, everything worked and shifted great before the crack. Nov 1, 2017 · The Allison torque converter doesn't seem to be locking up in 3rd gear or any higher gears either. Jun 12, 2012 · so i took it upon myself and installed a torque converter lock-up switch, works good, but still not locking all the way up, same as before other than me controlling it. It locked up good before. Torque converter lockup mechanically links the engine to the transmission by locking the torque converter solid instead of allowing it to slip between the engine output and transmission input. The problem is the torque converter lock-up clutch opens (disengages) momentarily and randomly at steady speed (when above the normal lock-up speed of 45 MPH) on both level and downhill roads and almost always at the bottom of May 16, 2022 · It has a torque converter lock-up switch that was on it when I bought it. Now, the only solution here is to replace the bearing, but it’s not an easy job. I did notice a secondary issue that The main function of the toque converter clutch or TCC solenoid is to send pressurized fluid to the torque converter’s clutch allowing it to achieve lock up in 4th gear based on a signal from the engine control module (ECM). Jump to Latest 8. This is a normally open solenoid and if it is stopped up will not allow the solenoid to exhaust signal fluid. While it's a normal feature that engages at higher gears to increase efficiency (less slip means less wasted energy) enthusiasts use on-demand lockup to deliver more torque to the transmission at lower Aug 8, 2002 · Re: Auto Tranny Torque Converter Lockup NOT Lockin Did you change the filter when you changed the ATF? Yes, low ATF or plugged filter can cause no lock-up, but you should also notice delayed shifting from 1-2 and 2-3. if accelerating - a little more throttle - it Torque converter lock up is one of those things that can be easily overlooked in the normal operation of any newer automatic transmission. But, any suggestions would be greatly appreciated!! Mar 11, 2014 · I am starting to get irritated with not having torque converter lock-up on the highway only, and I believe TC shudder is the cause of it. 5 - 1997 7. Note: I know when mine is locked anything more than a little gas will cause it to unlock. The torque converter is one of the most misunderstood – or, perhaps, non-understood – parts of the powertrain. I had it scanned at a trannie shop but shows no codes. It won’t do this at lower speeds so your F250 can take advantage of the torque multiplication that a torque converter provides. First thought it was a spark plug or misfiring but it’s the TCC lock up. Few things to look for though. I had the B&M lockup kit installed as well. Then the governor started hunting gears. Effective shift and torque converter lockup tuning can transform drivability and performance. If RPM's don't go up, it's not locked up. Apr 26, 2013 · I've got a 1987 Dodge W100 Power Ram with 318 and 727 auto tranny. Jul 11, 2008 · I have a suncoast IV tranny with a 1057 converter, a little over a year old. Apr 6, 2016 · 1999 - 2003 7. This could be due to a faulty solenoid, problems with the control module, or wiring issues. It lugs hard going into other gears due to being locked up. Simply put, a torque converter is a device that helps transfer the power made by your car’s engine to your car’s transmission. With the computer controlled transmissions we are used to driving today the converter will lock and unlock without us ever realizing what's going on. problem i am having is when driving at like 40 mph, the torque converter will lock, unlock, lock, unlock. So recently the pcm ground failed (single 16 gauge wire grounded to the block behind the pwr steering pump) after painstakingly figuring this out and repairing it, the torque conv now seems to lock up normally and stay locked on the highway. If the shudder is allowed to continue long enough it will damage the converter clutch. Jul 10, 2023 · When closed, it prevents any fluid from passing through to the torque converter. 4l80e with hd2 shift kit, circle d lock up converter, dominator efi. In this guide, we’ll not only explain what a TCC solenoid is and how it all works. When you put it in gear it kills it. I can put it gear Nov 13, 2024 · The way I can tell is that the RPMs go up, but the gear indicator stays the same. Jun 13, 2015 · Translated: Hi, my problem is that the converter locks and unlocks at constant speed and 2000 rpm, or if accelerating down from 4th to 3rd it stays in a rpm loop that jumps as if it goes down and up in speed. Bad TCC Solenoid A bad torque converter lockup solenoid can cause the lockup to not happen at speed. Everything seems to be working fine but I can not detect the converter locking. When functioning properly, it converts torque, providing smooth acceleration and improved fuel efficiency. . You may also have communications Mar 5, 2015 · When mine was doing this it ended up being a bad torque converter. Cold engine temperature is one of the common reasons why this can occur. The valve is located in the pump body and the solenoid is located in the pan. I read on here that tail lights can cause an issue with this so I Nov 3, 2009 · Could hooking up the TV cable, wiring up a lock up switch and flushing the tranny get the locked up converter to disengage? Or should I look for the closest tranny shop? I haven’t put the rear up to see if once in gear the wheels spin and the engine doesn’t stall out. I have this problem that started like over night. Frank Pewter 2001 Aug 21, 2024 · OBD-II Trouble Code P0743 Description Torque Converter Clutch Solenoid Circuit Electrical Diagnostic fault code P0743 describes a fault pertaining to one or more issues surrounding the manner in which a vehicle’s torque converter is “locking up”, in response to electrical signals present at the torque converter lockup solenoid. When the vehicle reaches a certain speed, typically around 30-45 mph, the torque converter clutch engages, locking the turbine to the pump. It stalls the This is usually a sign that the torque converter is slipping and not locking properly, which leads to inefficient power transfer. In the torque converter, the lockup clutch engages when the Apr 27, 2021 · It seems like the torque converter doesn’t like to lock up anymore except under heavy throttle. It's in a 1999 1500 with the 4. The transmission temps would also skyrocket on the highway. By making small, data-backed adjustments, you can fine-tune your system without risking damage. Running with a scan tool down the road it says the pcm is telling the torque converter to lock up. If the torque converter seal that is located on the input shaft fails, it will prevent lockup. I'm going about 2k rpm in OD at about 55-60. I did replace the solinoid. Jun 29, 2021 · Excursion - King of SUVs - Torque converter not locking up - I'm sorry, its another one of those threads. or the torque converter clutch solenoid. THanks Dec 5, 2014 · They are having a problem where the torque converter on occasion will not lock up. There have been some reported cases of the converter locking up due to a Dec 4, 2023 · In this article, I delve into the differences between lock-up and non-lock-up torque converters, explaining their roles and impacts on vehicle performance. Mar 31, 2018 · A common problem on many General Motors cars is the Torque Converter Clutch fails to release and causes the car to stall when it comes to a stop. The lock up clutch can go bad, which will cause you not to have torque converter lock up or the converter can go bad, which will cause the truck not to move. Aug 22, 2019 · I read a couple of SAE papers published by the developers of the new 8 speed, and the operation of the torque converter breaks new ground. May 16, 2019 · This is because there are codes that don't light the ses. Jun 7, 2008 · 350 lockup The TCC lockup solenoid can also hydraulically keep the converter locked up. ) I have EFI and can't see in tuning anything that would prevent it. Feb 28, 2024 · New torque converter, new electrical wiring, new TCC valve, was installed during the rebuild along with other items that’s with a typical rebuild. A bad torque Oct 5, 2024 · The P2757: Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off code indicates that the torque converter clutch (TCC) pressure control solenoid is stuck in the off position or is not performing as expected. 3L Power Stroke Diesel - No Torque Converter lockup & no codes - New guy here! Just bought 97 F250HD, and im loving it so far! except. … Feb 6, 2021 · Well, there are quite a lot of things that could cause a torque converter to lock up or damage entirely. A factory service manual will tell you what conditions must be met to engage lock up. It reduces converter slip to zero, providing better fuel mileage at slower speeds without sacrificing performance. If this is a trans or converter issue and I continue to drive it will it eventually screw something up? I am not sure what to do at this point. Initially mine had a harsh 1-2 upshift and once it got to running temp the torque converter would quit locking in and the code would show. But cause non lockup of tcc. This happened after my computer was reflashed with the latest update. Jan 6, 2018 · One easy test,hold brake pedal up with toes,when unlock happens,other is, on your other thread, delayed start,cts could cause that and this,so,no cel? overall engine performance? Feb 22, 2024 · The lock-up clutch is used to lock the impeller and the turbine together, which helps to improve fuel efficiency by reducing slippage within the torque converter. This article will discuss how to tell if the torque converter is locking up and the possible precautions/actions you can take to keep things under control before it results in fatal transmission or engine damage. com Learn more about torque converter lockups and discover some of the most common torque converter lockup problems, and tips for how to fix them. 0 cooler I put in it a few months ago, which the company said would be fine but my problem is the torque converter won't go into lockup. What happens when a torque converter clutch solenoid fails? The torque converter clutch solenoid is a common part that fails within the automatic transmission. When you cannot get your car to drive forward or get into reverse, then there is a high probability that there is a problem with our torque converter. Jan 10, 2009 · I have a problem with the lock-up clutch in my 1998 Jeep Grand Cherokee which has an automatic transmission and request your opinion of the cause and corrective action. I have ordered the parts. (Note: If the transmission is the original to the vehicle perform correction 1. Tranny needs governor and TCC solenoids. Under the Sep 18, 2017 · I have not tried locking the converter manually in the software while driving but with key on and pulsing the TCC solenoid I can hear it clicking. Feb 15, 2023 · OK, if it's not locking up - still showing slip - with the scanner outputs then odds are it's something mechanical. However, under certain conditions, torque converters can overheat, leading to a range of performance issues. Common symptoms of a faulty torque converter include an illuminated check engine light, overheating, stalling, vibrations, strange noises, and additional engine performance issues. Feb 20, 2024 · When the temperature of the coolant reaches a cold engine temperature, around 120 °F, it may cause a torque converter to lock up. The solenoid valve controls the fluid pressure of the hydraulic transmission, which enters the lock-up clutch. Any suggestions Thanks Feb 18, 2009 · Torque converter lockup is night and day after. He had similar issues once the transmission warmed up until they replaced the converter. installed an edge monitor on it a few years ago. After the truck gains a little speed, the torque converter will lock again and the RPMs go back down, all without the gear shift indicator changing. The transmission is shifting just as Apr 19, 2019 · What causes a torque converter to stay locked up on a 4L60E/700R4 transmission? We'll give you the solution & relatively easy fix. The torque converter quit locking up on me. New tcc solenoid and torque converter. also intermittently thowing p894 code. The main lock up solenoid goes from 97% locked to 15% and then back on. If I'm at 55mph it stays locked. It doesn't hunt or otherwise behave in a way that concerns me. Some vehicles have a “manual lock-up” feature, where you can manually engage and disengage the lock-up at any time. The transmission May 19, 2016 · 1994. When the ECM signal stops, the solenoid closes the valve and pressure is vented, causing the TCC to disengage. This will control the lock-up piston’s operation. See full list on cararac. The solinoid energizews when the 12vdc is applied. The problem is that when I am cruising down the road doing X MPH I dont see any decrease in RPM and Jun 9, 2015 · 97 ZJ 4. Dec 21, 2024 · The truck will rep up to the normal downshift rpm but you can feel the torque converter locking and unlocking over and over, making the truck lurch forward, and the rpms bouncing about 2 to 5 hundred from the normal accelerating downshift rpm when this occurs. So I tried highway speeds and it was definitely the case. 3L Power Stroke Diesel - 4r100 TC locking problem. On the way back, the torque converter didn't lock up until after Jan 26, 2021 · Fluctuating or intermittently is still faulty. When my TCC was slipping in and out of lock up i naturally went to a tranny shop, well 3 tranny shops, to try and diagnose the problem. Then when you get to 50 it will lockup 3 or 4 seconds later it will come unlocked. I had an aftermarket heavy billet torque converter and clutches installed along with a shift kit. Torque converters are sealed units; their innards rarely see the light of day, and when they do, they're still pretty hard to figure out! Feb 2, 2012 · I'm having torque converter lock-up troubles in my 96 Zr2, 145k miles on it. so May 22, 2025 · The torque converter increases pulling power by multiplying engine torque during acceleration. It has brake switch to disengage the torque converter and a May 17, 2023 · Very simple, it's a switch that allows you to manually control your torque converter lock-up solenoid. The clutch system within the converter used to be 'digital': on or off. Overheating transmission: The slipping torque converter can cause excessive heat buildup, leading to transmission fluid breakdown. bad transmission. If the face is not blued, then it still be the converter, or the torque converter clutch control valve, or the seals on the input shaft. If the converter doesn't lock up with it disconnected than you know it's external. Most of the time it is a stuck Torque Converter Clutch (TCC) solenoid, but this is not the only cause of this problem. May 12, 2007 · The problem is the TC stays locked up after driving out of 1st gear. 6K views 9 replies 5 participants last post by Megajoltman Jun 26, 2021 any4xx Discussion starter Oct 25, 2024 · A faulty torque converter can make it difficult for you to drive safely, especially in traffic or at high speeds. It will kick in and out every so often while cruising, but majority of the time runs out of lockup, going into lockup is rare. This transfers more power that is available and helps the fuel mileage. 1-3 gears learned as they are suppose to but in 4-5 arounf 55 mph it lunges or surges bad. I recently had a B&M 700R4 tranny installed with a 3000 stall TCI Torque Converter (10" with 12" lockup). Torque converter lock up is a mechanism that engages a mechanical connection between the torque converter’s input and output shafts, creating a direct drive. This can cause various symptoms, such as slipping, overheating, and rough acceleration. In this comprehensive guide, we'll delve into the intricacies of torque converter lock-up, what it means, the reasons behind lock-ups, and how it influences your vehicle's operation. Fixed!!! - I installed the new TC on Friday, it kinda of worked but im having problems with it locking up on 3rd gear, I got to let go of the fuel pedal for it to actually lock? If its like the e4od all brake lights work including the 3rd light on the Dec 3, 2019 · Torque converters use a lock up clutch to create a true 1:1 connection between the engine and the wheels. 1 In this video I discuss the symptom of torque converter shudder, give an example of it, and talk about the fixes of torque converter shudder. The converter he made for this exact combination worked flawlessly in the 2004R, but this one has a flaw somehow, that I just cant understand The fix below!!! Sep 21, 2024 · At a Glance Torque converters play a pivotal role in transmitting power from the engine to the transmission in automatic vehicles. the transmission shifts fine, and I don't see the OD light flashing. Coach isn't heating up yet but in the higher gears the tachometer and the speedometer are no longer in sink. 1st, the vehicle must meet certain conditions for lock up to engage. Jun 21, 2024 · Quick Overview A torque converter is an essential component in automatic transmissions, acting as a fluid coupling between the engine and transmission. Apr 6, 2014 · It will generate a CEL if it doesn't see that reduced engine RPM. The truck runs ok till it warms. In these cases, it is not worth disassembling the unit and replacing individual parts. Read on to find out what the warning signs of a bad torque converter are so you can address the issue promptly and stay Apr 3, 2011 · I just finished rebuilding a 1987 700R4 transmission in a corvette. When the TCC solenoid receives a signal from the engine control module (ECM), it opens a passage in the valve body and hydraulic fluid applies the TCC. Sep 18, 2020 · They flushed the 6. about 1,000 on tranny rebuild. Did these trucks come stock with a lock up torque converter or did they come both with and without lock up? A failing torque converter is one of the most common transmission problems we see. Feb 9, 2012 · On nearly flat ground/slight up-hill grade, in tow mode, the trans was initially (I think) in 3rd gear with the torque converter unlocked (2500 rpm at about 60 mph). I was reading that it could be the lockup solenoid going bad, or the torque Aug 1, 2023 · What Is Torque Converter Shudder Torque converter shudder is a common issue that arises in automatic transmission vehicles. This is usually a problem with trannys >150K miles. If left unchecked, it can trigger a chain reaction and cause damage to the transmission and other drivetrain components —which can lead to more costly repairs. You can check the torque converter for issues with a stall speed test or by brake torquing if you know how. What you are most probably feeling is called a lock up clutch. I'm going to seriously summarize here but My truck is a 1984 C-20 with 700R4 that is NOT computerized and it's pretty much a stock truck. I know the Dec 7, 2023 · P0741 Code Definition – Torque Converter Clutch Circuit Performance Or Stuck Off As the transmission is in D4, a solenoid valve activates on the torque converter clutch solenoid valve based on signals sent from the transmission control module (TCM) and engine control module (ECM). The one I took out never locked up. Apr 6, 2024 · For some time the torque conv would not stay locked up at highway speeds, would do alright at 50 -55 mph. May 7, 2009 · 98 GMC Sierra 160,000 mi. Apr 27, 2024 · Sharing my experience for anyone looking. All the shifting is fine, what would cause this? It's in a 2002 chevy silverado 2500hd. If you think you're having issues A Torque Converter Lock-Up is Caused by: As you may have guessed from the word “torque,” torque converters are devices that convert moving energy into static energy (torque). It shifts 1,2,3,4 in OD and shifts 1,2,3 in D. 3l and the 4L60E 4WD. 2004 sierra 2500HD 4l80, 307000km much of its life a plow truck. I checked the 3 wire connector on the transmission and the middle wire has 12 volts. this only happens when trying to maintain a steady speed - ie. However, when the engine turns more slowly it causes the torque converter to slip, creating heat. If you know you're in 4 (OD) and the RPM's go up without downshifting when you're climbing a hill, the converter is not locked up. Oct 1, 2012 · I have a 700r4 in my street rod. Trans is a TH-350C. Oct 14, 2023 · At around 60 mph and above the ses light begins to flash, would this prevent the torque converter from locking up? Is there a way to test if it is locking up or not? Aug 9, 2022 · To be specific, when cruising with torque converter locked up, initial throttle tip-in does not unlock the torque converter; that's what you're describing as the concern, correct? Dec 18, 2017 · What’s up guys, Been having issues with my torque converter not staying in lockup. Problems with the torque converter can thus cause many issues on your vehicle, including a drastic increase in fuel consumption and incapability of the vehicle to move under its own power among other things. I always assumed it was normal feature of operation. This Nov 27, 2004 · When I'm cruising down the road at whatever speed in whatever gear,my torque converter doesn't seem to be locking up. I read all the how to info on setting the tv cable and am sure it is set correctly. After reading this article, you will know the various parts of the torque converter, the symptoms of a bad torque converter, and how to fix torque converter problems yourself. When this happens, it’s often assumed that the converter failed and can be hard to diagnose without complete removal of the transmission and torque converter. Nov 27, 2010 · Ijust replaced my converter because of similar problems anytime went into lock up got a vibtation also would jump in and out of lock up. Other causes could be a mechanically stock TCC (lock up) solenoid, a stuck lock up valve in the pump or a bad converter. There have been some reported cases of the converter locking up due to a May 15, 2023 · How can you tell if your car’s torque converter is locking up and what can you do to fix this issue? What Causes A Torque Converter To Lock Up? It can be a bit confusing trying to pinpoint the cause or causes of a torque converter lock up. Feb 13, 2017 · Re: Torque converter lock up Here's a good read. very light throttle. Jun 17, 2016 · Drove and raced the car all year last year and parked it with everything working perfect. ) The stator tube scarf cut seal (Teflon ring) is missing or damaged—see Figure 3. This blog post will guide you through disabling the torque converter lock-up in your Chevrolet vehicle and provide tips on optimizing your transmission's performance. Apr 11, 2022 · How can you tell if your car’s torque converter is locking up and what can you do to fix this issue? What Causes A Torque Converter To Lock Up? It can be a bit confusing trying to pinpoint the cause or causes of a torque converter lock up. As you can imagine, a faulty torque converter clutch solenoid can cause transmission problems. I have done a full fluid flush and filter change. I took a little road trip today (about 75 miles), and noticed something funny happening to my transmission. Jan 12, 2018 · Hello I have a 1983 Silverado C10 that feels like the torque converter locks up even with the solenoid unplugged. The circumstances can differ from trans to trans, newer cars will lock up the torque converter early (say 2nd or 3rd gear), and remember newer trannys have more gears so 3rd in a brand new car isnt the same as 3rd in a car from the 90s. Jul 13, 2011 · I just put a good lockup torque converter in my truck (came out of my brothers transmission with 50 miles on it). Replacing the solenoid is not difficult [requires a pan drop]. As of late I noticed higher rpms at this speed and more of a torque converter slip than a lock up. Sep 14, 2017 · Usually, that means a failure inside the torque converter. One of the major signs that tell you the torque converter is locking up is when your car is unable to shift to a particular gear. A faulty solenoid can disrupt this process, leading to issues like overheating, slipping, and decreased fuel efficiency. This phenomenon is often experienced at low speeds or during acceleration. Some vehicles feature a torque converter lockup switch that allows you to Dec 3, 2018 · There is a solenoid in your GM converter that causes the the torque convertor clutch (TCC) to engage and disengage. 2nd the brake switch does affect lock up. And when this bearing fails, you will hear a semi-loud rattling noise coming from the torque converter at idle. However, if the torque converter fails to lock up, it can lead to a range of issues, affecting vehicle performance and safety. Jun 28, 2023 · 4 Common Torque Converter Problems There are some common issues with torque converters. It’s much cheaper and faster to replace the entire thing. Study with Quizlet and memorize flashcards containing terms like which of the following is not true of a lock up torque converter?, lock up torque converters use a damper assembly to dampen?, stall testing can be used to? and more. The converter must be installed on the transmission before the tranny is installed into the vehicle! Solution #2: Work the torque converter up and down on the input shaft, spinning it in the process. As of today the torque converter has no lock up at all. It occurs when the torque converter’s lock-up clutch continuously engages and disengages, causing vibrations or shudders when driving. Apr 4, 2016 · The “B” refers to the circuit that controls the brake lamps, which is also the circuit that deactivates the cruise control system (where fitted), and the torque converter lock-up mechanism on vehicles with lockable torque converters. From what I remember the converter can stay locked up while shifting. This condition affects the lock-up mechanism of the torque If I accelerate quickly, no issue locking the converter in 4th gear. Is there anything I am missing? Jan 12, 2015 · Hey guys, Been having some trouble lately with the torque converter not locking up all the time when I get on the highway. I went to a very well known performance shop, Pacific Coast Transmission, a mom and pop place around the Feb 14, 2015 · The torque converter is a fluid coupling, so it doesn't engage or disengage. The truck has 112k on it. Malfunctioning sensors, such as the torque converter speed sensor or transmission control module (TCM), can cause the torque converter to unlock prematurely. This may be due to high resistance in the torque converter clutch solenoid, which results in lower torque converter lock pressures. Nov 1, 2024 · Causes There are four potential causes: The lock up solenoid feed orifice is plugged with debris—see Figure 1, above. Dec 19, 2011 · This question has two parts: 1. I was wondering what the possible causes could be for the torque converter not locking up. Also, when the overdrive unit locks out, it also makes the torque converter to lock up as well. This one is locked up in ALL gears (1,2,3,4,R). Mar 14, 2023 · If the torque converter is locked in the drive or idling gear and does not release the transmission, you most likely have a problem with the converter clutch. Any advice appreciated. I can even downshift and let it upshift again, with no lock. Lock-up eliminates the slippage, which reduces heat and improves fuel economy. torque converter won't lock up on highway, screaming at 2600rpm at highway speeds. It is being sporadic on if it will lock up when doing truck pulls. Aug 3, 2011 · well, there a 2 parts to a torque converter, the torque converter and then the lock up clutch in it. Nov 1, 2022 · A torque converter is extremely important for cars with an automatic transmission, but understanding what causes one to fail is critical information. There are many things that can cause non lockup . Pure fluid torque transfer is reduced and Mar 6, 2013 · However, this will help diagnose the problem. I thought it couldn't lock up in 1 and R. (4wd lo range, tow/haul on. This will cause the engine to stall when the vehicle comes to a stop. You will be able to tell a bad torque converter vs. He bought it with a rebuilt transmission/torque converter, but the torque converter was no good and they replaced it under warranty. The torque converter is a basic part of older vehicles and can fail in a few cases. The long I let it go the worse the vib got. This is typically much easier and less Introduction In the world of automatic transmissions, the term "torque converter lock-up" is a critical concept that impacts both the performance and efficiency of your vehicle. Need a replacement transmission? Get an estimate for replacement transmissions and local installation. anyways replaced the transmission this past weekend with a different torque converter and transmission, install went smooth, besides the unexpecting purchase of a flywheel. It transfers energy via hydraulic fluid. has never shown the lock symbol in the gear selection screen. Depending on how hard you are accelerating it may unlock for more torque multiplication May 5, 2020 · I have a 2004 chevy 2500hd 6. Jun 21, 2024 · A malfunctioning torque converter can wreak havoc on your vehicle’s performance, leaving you wondering, “Why won’t my torque converter lock up?” This common issue can manifest in various ways, including shuddering, slipping, and a noticeable decrease in fuel efficiency. Disconnecting that rear connector would disconnect the torque converter's lockup solenoid which would cause that CEL to illuminate indicating the ECM did not see the expected 150 RPM drop after signaling it to lock. got a free "alleged" working stock TC from friend, dropped trans May 12, 2024 · A torque converter, a crucial component in automatic transmissions, plays a vital role in transferring power from the engine to the transmission. It lets you lock your torque converter in any forward gear. Jun 23, 2021 · May's Cummins of the Month is now open for entries! 68RFE: Feels like torque converter is trying to lock in 1st & reverse. Aug 30, 2024 · Torque converters are vital components in automatic transmissions, responsible for smoothly transferring power from the engine to the wheels. This lets the Disabling the torque converter lock-up can be a useful solution to these problems. It slips in and out while on the highway. Jan 24, 2024 · What happens when torque converter doesn’t lock up? Answer: Your problem is a torque-converter clutch that is staying engaged when it shouldn’t and stalling your engine at a stop. Faulty lock up solenoid—see Figure 2. Trans works perfect until it gets hot than doesn't wanna unlock the converter and wants Oct 17, 2014 · If so, you’ll need to re-install the transmission with the converter in place and then bolt the torque converter to the flexplate. Here are several bad torque converter symptoms and signs to look out for. Slipping reduces fuel economy and heat can damage the converter and the transmission. I recommend sticking with the stage 2 upgrades as stage 3 is pretty firm (what I did) and 4 and 5 are race only. The rpm drop will be noticeable. Torque Converter Lock-up For many years, stick-shift vehicles got measurably better fuel economy and range than those with automatics. Jan 16, 2024 · One of the topics of interest that may add to the curiosity is the working of lock up torque converters. The advantage of a lockup torque May 19, 2021 · The torque converter is an important component of your vehicle’s transmission. new converter solved problem. It was clear enough why: Old-style torque converters necessarily allowed an rpm loss between the crankshaft and the input shaft of the gearbox. It has been locking up fine all summer, now all of the sudden no lock up. 6L 6-speed. But also, the key symptoms you might notice if your car has a bad TCC solenoid. Dec 6, 2019 · Ok so a few months ago I posted about issue about my torque converter lock up control. P0740 Torque Converter Clutch, No RPM Drop @ Lockup Click to expand Mar 10, 2013 · 2001-2002 Trucks with 4R100 Torque Converter Clutch Solenoid Codes: Some trucks build between 1-1-01 to 5-1-02 may exhibit a flashing OD light and possibly harsh shifting, with any or all of the following trouble codes: P0740, P0741, P0743, P1744. It down shifts Failure in the closed position When a torque converter clutch solenoid fails in the closed position, it means that the torque converter clutch will be engaged at all times. Mar 16, 2018 · With the engine running and 12 volts to the transmission, if the trans has already been converted, when the trans shifts into fourth gear this will also engage the torque converter clutch (TCC) to lock up. The valve opens allowing for fluid to apply the TCC, and when the signal stops, the fluid is then vented out which will then disengage the clutch. General Motors has issued a few Technical Service Bulletins (TSBs) relating to this problem. Had this issue before the rebuild with the torque converter going in and out of lock up. May 12, 2007 · Clutch, Transmission, Differential, Axle & Transfer Case - 4R70W Torque Convertor Staying Locked - I have a 95' F150 supercab with 5 liter and 4R70W trans. This is typically used for towing or heavy load situations to prevent excessive heat build-up in the transmission. It has power, All the solenoids in the trans get power from the rely in the engine compartment, Pcm supplies a ground to apply the solenoid when it goes into lockup. The problem isn't electrical. This is the converter un-locking. com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Feb 28, 2023 · The thrust bearing sits between the torque converter and the transmission gears, and it’s a flat needle bearing in most cases. Join the #1 RV Forum Today - It's Totally Free! iRV2. Sometimes it will lock again for a few seconds but most times it Oct 5, 2024 · The converter flashes up to about 3800-4000 which is fine for my application so it doesn't need to be any looser up high, it just needs to turn loose at idle. Sometimes, you can find inexpensive replacements for torque converters. A faulty torque converter clutch can also cause other symptoms such as slipping and rough acceleration. Your torque converter also manages the power link between your engine and transmission. 0 42RE Trying to limp home. I never used it. After driving it for Feb 3, 2025 · Can a Torque Converter Stay Locked? Yes, a torque converter can stay locked in certain situations. To know more about its working and the new lock-up mechanism, read on. The Jan 7, 2024 · Your torque converter cannot lock up in 1st unless there is a SERIOUS problem inside the transmission. Was it locking with the original converter? Was a new Oring installed on the input shaft of the trans during replacement? Your tune could be optimized to help reduce slip in the lighter load areas, but this will also require complete reworking of the shift pressures as it will Oct 2, 2024 · At a Glance The torque converter is a crucial component of automatic transmissions, responsible for smoothly transferring power from the engine to the transmission. In this blog post, we’ll delve into the reasons why torque converters get hot and explore ways to mitigate this issue. Just rebuilt the transmission. This should all be covered under warranty if it was just built 500 miles ago. Mar 15, 2013 · Look up the Torque Converter Solenoid on your vehicle on RockAuto so you know what it looks like and disconnect the wire for it. Is that a auxiliary valve body issue or the converter itself. Over winter I put a turbo, cam and injectors in. Sep 15, 2005 · General Automotive Discussion - Symptoms of torque converter that won't unlock? - What are the symptoms of a torque converter that won't unlock? I've been trying to understand how it works to see if I'm suffering from this problem. Another cause could be a sticky or worn out stroke valve that controls the TC lock-up. Today, the torque converter locked up and won't disengage. The stator is located between the pump and turbine and is attached to the torque converter housing. Drivers may feel a rumbling, shaking, or vibrating sensation Nov 8, 2019 · A lot of bad things can happen to your car when the torque converter starts failing. Jan 25, 2009 · When a lock up torque converter locks the and you give it a little gas the RPM’s will not rise until the car starts moving faster. GM learned after the 700r4 to make it so fluid pressure is not available to the tcc circuit in 1st gear. Until engine temps The torque converter is usually found between the transmission and the engine flexplate. If this does not resolve the problem, replace the torque converter. There is also a specific diagnostic Jul 1, 2013 · My dad has a Chevy van with the 4l80e. Under what circumstances does the torque converter normally lock up in the 4L80E? 2. At a stop, in fwd or reverse the truck lurches 3 or 4 times until the engine dies. Thus keeping the TCC lockup valve applied and keeping the converter clutch applied. - 96 4L60E So. Torque convert Jun 9, 2018 · 2009 - 2014 Ford F150 - Torque converter locking up at stop - 2010 F150 4. Nov 29, 2012 · The RPM's should jump up a few hundred. These converters have been a matter of interest for many owing to the fuel efficiency and better life of the transmission. This system has a multi-plate clutch assembly and can vary the percentage of mechanical torque transfer over a wide range depending on load. I don't know what driveability problems this might cause in the transmission or if it invokes a limp-in-mode so you will have to experiment at your own risk. It happens all the time when the truck has set for over 8 hours. Sep 19, 2011 · Im not sure exactly but the pwm eliminator solved my problems with the torque converter locking up. When driving normal with the switch on, it would shift OK, and then at about 45-50mph, the TC would lock up like normal and at about 35mph, let off the throttle, and the engine would go to idle when the TC would unlock. Sep 28, 2017 · Torque converter shudder is actually caused by the ATF wearing, not the converter clutch wearing. If I do just city driving and get the car warmed up and then go on the highway the torque convert won't always lock up, but if I go straight onto the highway it almost Jan 18, 2008 · I have a 4l80E and having trouble with the converter not staying locked up while at cruising speeds (70 to 80 mph). They are wanting to rebuild it. It engages fine when I am on back-roads with no issue Jul 11, 2008 · I am having some problems with my lockup. 0 with a 4l80. 3. A week ago when I drove it a 4 hour trip, half way thru the trip the torque converter stopped locking up, leaving me running at 2700 rpm on the freeway instead of 2000. Keep reading to find out these common torque converter problems and how to fix them. If I accelerate moderately, or cruising down the highway at a set speed above 70, the converter does not lock, even varying my speed up and down does not get the converter to lock. May 29, 2024 · The torque converter clutch solenoid plays a significant role in engaging and disengaging the lock-up mechanism in the converter. When I give it gas, the rpms go up but the truck doesn't move much faster, like its slipping. The transmission shifts extremely smooth, and usually would jump into OD around 40 mph. It's a mechanical clutch in the torque converter that, when engaged, locks the torque converter parts together making a direct connection between the engine and transmission. The solution is to lock the converter. good luck Mar 14, 2008 · They rebuilt it, i installed it and now the thing does not run right. Apr 29, 2019 · The clutch will lock up so that the torque converter will rotate at the same speed of the engine. yrndbee osodp wnot txxbbl ukgkkrj wggotm qfa obhfu gaji iuwq