You can modify the trans to accept a non lock up but it involves a different input shaft, pump and also main control valve body IIRC. 1 diameter). The TC is locked at all other times except: it will disengage to increase rpm's for more power. This is a relatively common torque converter issue that often results in vibration, usually before or after the clutch lockup of the torque converter. 515. When I did the fluid last time it helped a lot with the lockup hunting around. The stator directs fluid under pressure to the turbine. When the lockup torque converter is engaged, it causes the engine to lock to the transmission input shaft. For WOT Launches and acceleration to 70+ mph, the TCC can't lock until part-way through 3rd gear. Transmission Noisy in Neutral. Put your foot on the brake or lift your foot off the fuel peddle and it will unlock. Transmission has clean fluid at the correct level. Mark. The valve is located in the pump body and the solenoid is located in the pan. The converter’s turbine is attached to the drivetrain via the. i had perfect operation of the transmission for a couple hundred miles then suddenly stated having an occasion hard shift into second feeling. When this happens, your torque converter has a higher effective stall speed. June 14, 2011. This is why I wanted to discuss it a little further. Received 903 Likes on 478 Posts. I had to have the truck towed back home today. This eventually delivers a direct 1:1 drive ratio. When the lockup clutch remains open and does not lock even when the fluid in the converter. Torque converters use a lock up clutch to create a true 1:1 connection between the engine and the wheels. The first part of the torque converter is the impeller. vehicle shutters and RPM drops at traffic lights or backup traffic then. #1. 0, it immediately shifts from OD to 5th gear. Maybe the better question is how do you know if the Torque. I would like lock-up to occur around 50 mph for this pickup with tall gears (2. When the truck is accelerated to 45 - 50 mph and held at a steady speed for a few seconds the converter locks up like it was hit with a hammer. This leads to the engine stalling when you brake the car. If you provide 12 volts to this wire (going to the tranny), you will get full control of the converter lock up with or without brakes. If this happens, you will need to follow the vehicle maintenance guide to have the torque converter replaced. This keeps your Grand Cherokee’s engine from turning at the right RPM for any given speed, which can really hurt fuel economy. The car drives cold or hot fine until It goes up a hill or can be on a flat road the Overdrive shifts down and will not shift back until the car is stopped and turned off for at least 45 sec. After driving it for say 2 to 3 miles it goes away and operates fine. If it doesn't, then you have either a bad converter, or a damaged seal on the input shaft, or a sticking valve in the pump body, or a bad TCC solenoid. Some vehicles have a torque converter lockup, which means when the vehicle is traveling at a certain speed in high gear the torque converter "locks" and there is no slippage to the transmission resulting in better fuel economy. 5834 posts · Joined 2010. Could certainly be misfires from worn out spark plugs, but could be faulty injectors also, besides the transmission possibilities. The torque converter clutch (TCC) piston in the lock up torque converter worked like a one-way valve. I have been doing so searching and seems like most people complain about their not locking up, but mine is locking up really early. We recommend taking your vehicle to a transmission expert to assess and rectify any potential damage. MPG numbers were great; they were just a little higher when the converter would lock. when the inevitable happens (torque converter goin out) i want to know what to look for. This keeps your Caravan’s engine from turning at the right RPM for any given speed, which can really hurt fuel economy. Road test for lock-up (can be done on a lift). Yes, it feels like another shift and the engine sounds like it bogs down when it locks up. On the extreme race, it is. What. Use of unsuitable transmission fluid. Automatics evolution (a couple guesses as it's invention was. 2. Insufficient hydraulic pressure. Under normal circumstances the shift sequence is 1-2-3-torque converter lockup. The e4od and 4r100 can both have tcc to come on in 1, 2, 3 and 4th all depending on throttle and speed. It's all in the programming Fellas. This may result in hard starts or a power loss to the vehicle. 3. Torque converter slippage is monitored by the PCM using some trans sensors. It should always be locked in 4th, 5th and 6th. Turn on the ignition and allow the engine to idle for a few minutes. Put in gear, applied the brake, it killed the engine. You have to ground the purple with yellow stripe wire to lock the clutch. start the truck, then put it in drive, rear wheels will spin, then as you put on the brake, if the engine starts to die down. The fact that the torque converter locks up at all under any circumstances means that it is probably working just fine, and the computer is simply not ordering it to lock up. Yes, it feels like another shift and the engine sounds like it bogs down when it locks up. If the purple with yellow stripe had power on it the clutch would not be locked. The solution is to lock the converter. 2. It generally occurs at part throttle and light acceleration, between 15 and 50 miles per hour, just before the shift to one of the top gears where the converter reaches "lock. The only way to get it to go back to normal is to let it coast in gear, once it gets slow enough the truck will drop from 6th to 4th then back up to 5th and then the torque converter will lock up and it will drive as normal. The stock tune Function locks is at 32mph at any TP. 1st/TC Lock-up/2nd/3rd. This transfers more power that is available and helps the fuel mileage. Disconnect the electrical connector from the solenoid. However, the RPM would go up 200-300 if it was unlocked. Bad Transmission Step 1. Pull the trans, remove the converter, then remove the pump cover and pump assy. I bought a new lock up solenoid and it still will not release. A bypass clutch equipped in a torque converter assembly is a friction element which when fully engaged, can directly connect the engine to the. Thanks Mark. Even if there are no codes, that just means that. This keeps your Ram’s engine from turning at the right RPM for any given speed, which can really hurt fuel economy. 4. Replacing a working solenoid with a new working solenoid isn't going to fix anything else. The PCM in most '99-up PSDs will lock the torque converter at about 37 MPH when accelerating, and unlock it at about 37 MPH when slowing down. C4 Tech/Performance - Torque Converter will not lock up. The two things I dislike are crappy fuel mileage and the inability to get the torque converter to lock below 45 mph. These converters prove to be a boon when it comes to driving a heavy vehicle down the. Also you could have a problem in your transmission's accumulator body. I had my transmission beefed up by a local builder about a year ago, but the shifting is still pretty bad. Go above 41 mph. ZF torque converter cut-away A cut-away model of a torque converter. runs fine while in park or neutral but dies when I put in reverse and surges like running out of gas when coming to a stop in drive. Check the trans control plug and make sure it is dry. Shuddering. My torque converter will occasionally lock up while stopped at a light or when backing out of the drive way in the morning. 4. Comparing this value with your torque converter and engine. Reaction score. fix. No, a torque converter cannot lock up an engine. The way the lock-ups on my other 2 vehicles have worked is like this… 1rst gear: No affect 2nd gear: No affect Drive: Locks up Torque converter at ANY speed as long as it stays in drive, (about 20-25 mph with no throttle should get it into drive, and it will still kick down into 2nd with enough pedal). A standard torque converter is a fluid coupling to the transmission, not a solid connection. #6. 99Classillac. This is what happens: When the computer sees that you are at a set speed. If you have done that then most likely the computer is getting info that is telling it to not lock the converter. 3940 posts · Joined 2006. Any and all help would be appreciated. When this happens, your torque converter has a higher effective stall speed. 7L with 111,000mi. There are six main parts to the inner workings of your torque converter. #7 · Dec 21, 2011 (Edited) The TC will lock at about 47 MPH in 3rd or 4th. If that was the only change you did, it seems pretty cut-n-dried to me. net is a forum and information center dedicated to the Ford Crown Victoria and its siblings: Mercury Grand Marquis, Mercury Marauder, and Lincoln Town Car. When this happens, your torque converter has a higher effective stall speed. As the car is coming to a stop the engine rpms come way down till the engine starts to buck, and the engine will die as it stops if I dont put it in neutral. A torque converter is a type of fluid coupling device used to transfer engine power to the gearbox and driveline. mattymax. Here is the thing, I have a switch under the dash to kill the power to the lock. 4. See more. Repair shops will charge between $600 and $1000 to replace a torque converter. Prior to disassembly the transmission did have problems but. . Nowadays all cars and trucks use a feature called lock-up in the torque converter. If you want to disable the torque converter lockup, you will need some kind of a cruise control type of a brake switch, which works well in disconnecting the 12-volt power to your lockup module each time you apply your brakes. All 3 said the unit was fine that it was the converter. Neutral and park it runs fine. Originally Posted by Lead Head. I just finished a complete rebuild of my transmission with new solenoid pack and new torque converter. Torque converters use a lock up clutch to create a true 1:1 connection between the engine and the wheels. 3L Power Stroke Diesel - torque converter lock up and the cure - In the past couple of weeks the trans has started a new habit when first driven with cold trany. Thus, energy loss. After reaching approx. Lock-up OFF 41-47mph Gear Ratio 3. Just as mentioned prior, the torque converter consists of several parts; either of these parts can get damaged and cause the system to fail. If I have to tolerate this shudder just to get a few more. Power is fine and the truck itself runs just fine. Neutral and park it runs fine. Rib Mountain, WI. 1997-2006 Expedition & Navigator - Torque Converter Circuit Electrical Problem code P0743 - My torque converter stays locked up when I come to a stop or slow down, which causes the. The 722. Over the 5 model years that Ford produced the 7. Figure 5. My SUV’s torque converter goes in and out of lock up when going a steady cruising speed. One thing that might cause this is a bad torque converter. The switch will lock in 1st only if you lock it up is 2nd or higher first. The PCM uses these sensors, along with the TRS, to determine gear range. Location: Ontario, California. It would be bad to be in OD in the city ONLY if the trans is shifting frequently in and out of overdrive. When this clutch is engaged, it results in the engine locking to the transmission input shaft, which then causes a one-to-one drive ratio. 8 crewcab. Shuddering. Replaced internal transmission wiring harness - did not fix problem. Torque converter will not stay locked up during normal driving conditions; flat, straight road. 4l) 245mm early pWM low Carbon Content 91-95 (w/ 3. You said: but I know what it feels and sounds like for a converter to stay locked up after it is supposed to be unlocked. The stock tune Function locks is at 32mph at any TP. However, if the engine is misfiring and is unable to turn over then the torque converter may be locking up. 6. Usually the torque converter lockup solenoid is at fault in your condition. Torque converters use a lock up clutch to create a true 1:1 connection between the engine and the wheels. A bad solenoid, a damaged wire to the solenoid, a leaking/missing seal on the input shaft, a stuck control valve in the pump body, or a bad torque converter. This subsequently means that the drive ratio becomes 1:1. This keeps your Expedition ‘s engine from turning at the right RPM for any given speed, which can really hurt fuel economy. See more. When the PCM sees a parameter go "out of spec", a code is set. If you have a 96, the lockup switch wont change the rpms at all. This can be incredibly dangerous and should be addressed immediately. After much research, and debating, I decided to install a switch to better control the lock up of the torque converter. probably to around 30 or so. You are browsing camaro6. 1987 - 1996 F150 & Larger F-Series Trucks - E4OD torque converter lockup going in/out - My torque converter lockup will sometimes go in & out of lockup went cruising. Torque converters use a lock up clutch to create a true 1:1 connection between the engine and the wheels. When I release the accelerator pedal only slightly on my 2006 F350 6. 1999 - 2003 7. acdcontheroad said: I rebuilt my 4L60E in my 1994 Chevy S10 along with buying a remanufactured OEM torque converter. The cost to replace a torque converter can be quite steep, depending on the repair shop. The solenoid controls the hydraulic fluid for TCC apply and release. We tried vehicle speed sensor and did not do anything. ― Neil deGrasse Tyson. It feels like the transmission has 5 or 6 gears. He had similar issues once the tranny warmed up until they replaced the converter. It shouldn’t seize, but if it. So this would need to be checked before merely replacing the torque converter clutch solenoid. Spray out with electrical contact cleaner and try dielectric grease to keep corrosion out. Anyway, the last time I drove it, all the transmission functions were normal. I have no codes or lights flashing on the dash. put in park or neutral and restart and engine revs/idles fine. Thing is that it does lock up, it only locks up at certain speeds. Lock-up torque converters provide better fuel efficiency and improved performance, while non-lock-up torque converters offer smoother gear transitions and are more durable in some applications. If a transmission shop pulls it, they will probably want to rebuild the whole transmission, especially if it has some miles on it. There are basically three ways a torque converter lockup clutch can fail: It can stay locked up, stalling the engine when the car is braked to a stop; it can never lock up, which shows up as an increase in fuel consumption and radiator temperature; or it can slip when engaged, allowing engine speed surges at a constant. Turn it on and see what happens. However, a weak torque converter can slip too much when unlocked, and can even slip when locked. Here is a dyno graph of a car ran with a lock up, then a non lock up conveter tested the same day. It drives the front pump of the transmission. 3. When the car is braked to a stop, the clutch may become stuck in the locked up position, which will cause the engine to stall. 2008, V8, Sport Trac, 114k, 2-wheel drive. 08 gears) and is constantly locking/unlocking in part throttle application. Torque converters use a lock up clutch to create a true 1:1 connection between the engine and the wheels. FYI took it to 3 separate trans shops. material (9), a total converter engagement can be. Mechanic said he needed a new transmission, due to a torque converter code and it stalling in drive. Hopefully it will help a good bit. Now they are thinking it may be something to do with seals in the valve body. 2. This front fan comes in varying diameters and blade pitches depending on. It will unlock, lock, unlock, lock, etc.