If you go WOT from a stop it will not lock until the 5/6 shift. However, these two conditions can exist from other root causes. #6. One day going down the road on a cold morning the O/D light starting flashing and the trans went into limp/safe mode. The stator is called the middleman. Gear shift problems. Breakdown or Damage of Core Components. Who knows. 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. Getting Started. I would like lock-up to occur around 50 mph for this pickup with tall gears (2. There may be electrical tape holding the cover to the harness. This trans does not have a oil temp sensor, the engine coolant sensor makes perfect sense though. For example, hitting the TC lock swith at approximately 20 MPH (about the time after the shift to 2nd gear) the impeller woudl be spinner at a much. The farther above this rpm, the lockup converter starts to have the advantage. Usually when the converter fails to lock up when it is supposed to (PCM controlled) you get P0740. Part of the reason for lock-up converters not work- ing in the past was the crew chiefs needing to know what to do when the converter went to lock up. I tried to do this in production when I was developing the production tunes, but was shot down by manglement. Location. Was hoping this wouldn't happen. The PCM uses these sensors, along with the TRS, to determine gear range. Want Answer 1. Now My question is a little different than your answer. I just want you to know my shop has replaced a lot of these transmissions. It drives the front pump of the transmission. worked fine. It only flashes when the computer thinks something is wrong with the shifting. I can feel it dragging the engine down. 0 Explorer,37k miles convertor locks and unlocks under a light load,usually will unlock and then lock right back up,any ideas? The dealer wnts to replace the convertor for $800. The torque converter clutch is controlled by modulating pressure to it so TCC slip can be regulated to whatever the PCM's desired slip ratio is, the torque converter is usually not locked in lower gears. People use a torque converter lockup because it provides fuel economy. Now manual 4/5 & 6. This will make the TC unlock. all shifts nice and firm,. They said the transmission itself is working properly and the PCM is commanding the converter to lock and unlock. . When a torque converter is malfunctioning it can. . . We have repaired two wired to the torque converter cylinoid internally. very light throttle. I am changing my tranny fluid tomorrow. grounding the solenoid engages the clutch. Remove it. It has a torque converter lock-up switch that was on it when I bought it. People tell you to turn OD off on hills because frequent downshifting and gear hunting heats up the transmission and can cause it to burn up. Pulling a grade at 50mph, I flipped the torque converter lock switch. Join Date: May 2008. The 5th gear is actually over drive when the TQC locks up making the tranny spin at the same speed as the engine. You can also look at the TCC (torque converter clutch) to check if it is being commanded to be engaged at the proper time. If you go WOT from a stop it will not lock until the 5/6 shift. 4r70w converter staying locked. The stock tune Function locks is at 32mph at any TP. See moreIt could be that this switch has failed and is feeding a constant signal to the converter to lock up. It allows the engine to warm up quicker and reduces emissions I believe. If i drive my truck at 60 the rpm's will ne around 1700. The MAF sensor was absolutely the problem, and cleaning it resolved the problem. However, when the engine turns more slowly it causes the torque converter to slip, creating heat. Turn on the ignition and allow the engine to idle for a few minutes. exhaust manifold on it. We tried vehicle speed sensor and did not do anything. This solenoid usually locks up the torque convertor (which acts like a clutch in an automatic transmission) when you are driving at a certain speed, and unlocks it when you press the brake, and/or come to a stop. Some quick facts to do a level-set for you: *133k miles 2000 4. 94 F350 5. So you need lock up to avoid overheating when driving in 4th gear. Posts: 28. It was $500 at a salvage yard but the garage charged me $700 plus $500 to install, thus the $1200. Trans failed, had reverse but no forward gears as was the reason for replacing trans in the first place. 4. Also check for debris in the center of the pump (which can indicate a converter failure). Converter lockup only changes about 200 rpm. 4. We also include a cruise control. At 65 It was spinning 2,000rpm were it normally would be approx. A torque converter is a device, usually implemented as a type of fluid coupling, that transfers rotating power from a prime mover, like an internal combustion engine, to a rotating driven load. You have to ground the purple with yellow stripe wire to lock the clutch. 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. so, 1-3 will stay released as all mph is under 317. If you have a 96, the lockup switch wont change the rpms at all. If you are having to use too much pedal it'll kick it out of lockup. When this happens, your torque converter has a higher effective stall speed. Repair shops will charge between $600 and $1000 to replace a torque converter. If you are a car enthusiast, you have probably heard the raging debate on whether disabling the torque converter lockup is really worth it. In the oem tune, the torque converter locks up at 1500 rpm's and unlocks at 1350. Received 903 Likes on 478 Posts. This is what happens: When the computer sees that you are at a set speed. However, the RPM would go up 200-300 if it was unlocked. When this happens, your torque converter has a higher effective stall speed. 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. In my mind, using all the logic I can muster up, I can't think of a possible explanation that would say that locking the TC up at a much earlier speed does not damage the torque converter. · Overheating transmission. The torque converter has a stall around 2,300rpm and a firm multi-disk lock up clutch. General Motors has issued a few Technical Service Bulletins (TSBs) relating to this problem. The torque converter is locked up. I have a strange issue, my torque converter has been locking up very early, at about 25mph. What I am all fuzzy about is, for lock-up torque converters, the tranny-side blade gets physically bonded to the engine-side blade above certain RPMs. If the trans locks the converter in third, shifts into 4th and the TCC MPH apply vs TPS is higher it will unlock until the value in the 4th gear table is met. See more. You will want to maintain between 1,600 to 2,400 RPM to keep it in the proper torque range for towing and allow the TC to lock up. The stock tune Function locks is at 32mph at any TP. The torque converter clutch (TCC) piston in the lock up torque converter worked like a one-way valve. If I have to tolerate this shudder just to get a few more. 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. Posts: 2,429. Shuddering. i can feel the engine start coming down like an exhuast brake since its rpms are so high. This keeps your Ram’s engine from turning at the right RPM for any given speed, which can really hurt fuel economy. Some potential problems with the transmission of a vehicle could be related to the torque converter clutch solenoid. 7) and big tires (29. This 'lockup' would happen when you are in high gear and going above about 45 mph. The antilock light is 0n and stays on. Shuddering. There will be no problem of lock-up in gears 1 or 2, even though there can be overlap in speeds. Refuses to Go Into Gear. Additionally, a vehicle’s torque converter clutch solenoid can fail at the hands of electrical abnormalities as well. Your Car Shudders. 160k on the truck. Road test for lock-up (can be done on a lift). It transfers the power from the engine to the transmission input shaft. I decided to install a three (3) way switch though. 4. It would be bad to be in OD in the city ONLY if the trans is shifting frequently in and out of overdrive. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter. If it was unlocked the RPM would drop to 900 and your speed would remain the same. The best thing to do to confirm the problem is to test the torque converter. The solution is to lock the converter. If i go up to 64 then the converter locks up and I can go back down to 60 and turn 1500. Torque converters have 3 basic stages of operating: Phase 1 — Stalling: When you’re braking at a red light or a stop sign and your engine is still running, it applies power to the impeller, which rotates independently, without coupling with the turbine. Get the Problem Diagnosed. Phase 2 — Acceleration: When the red light turns green and you step on the gas, the. With the OD off the trans will stay in third, with the converter locked. Hello, These cars had a problem with the torque converter falling apart in some models. Torque converters use a lock up clutch to create a true 1:1 connection between the engine and the wheels. Read Also: Bad Torque Converter vs. Check for transmission slippage. The main reason a lockup torque converter is used is better fuel economy. 1) Locate pin #53 on the ECU. One of the ways that OE manufacturers satisfied these requirements was with the use of lock up torque converters. A judder from the torque converter lock-up clutch may be felt while driving between 20–45 mph. 4. 4. probably to around 30 or so. The torque converter stays unlocked in lower gears, that's why it free-revs more in first and second gear. The second cause is undersized friction plates in the torque converter clutch in the torque converters on all AOD-Es from 94 to 98. It is an alternative to a mechanical clutch. Shuddering. Pull the trans, remove the converter, then remove the pump cover and pump assy. I would say if you are sure the lock-up solenoid or control valve aren't sticking in the valve body it's the torque converter. What happens when torque converter stays locked up? So, there are three potential ways a torque converter lockup clutch can fail. i also replaced the decant cable and reset. soleinoid pack. It will let you lock the tc anytime the computer is not commanding it to do so. 0 = 600 ft. Similar to how a manual transmission utilizes a flywheel and a clutch assembly, most automatic transmissions have a flywheel and a Torque Converter. It multiplies the torque of the engine and transmits it to the transmission. See it: If you have a tachometer or a Scangauge to check RPM’s, you can tell when the RPM’s look more closely related to the speed. And returned back to stock and really no difference. After reaching approx. Remove it. When this happens, your torque converter has a higher effective stall speed. That could be a problem with the brake light circuit, the throttle position, vehicle speed, or a few others. So when it sticks, it will not allow slip when you try to stop, as. You can try grounding the TCC circuit to see if that makes the converter lock. 0 awd explorer the converter isn't unlocking. lockup being stuck. 5:1. On Edit: As Mark stated, the valve body spring kits do nothing to help TC lock up. Basically the T/H button ensures the Torque Converter stays locked up thus ensuring that your tanny fluid circulates more, which in turn keeps the tranny running cooler. The torque converter clutch is electronically modulated and provides for partial engagement in third, fourth or fifth gears. When it engages, the clutch directly contacts the convertor housing, allowing no slip. Typically, early applications had a Torque Converter Clutch (TCC) that was either applied (on) or released (off). Shuddering. now the torque converter doesnt lock in 4th gear like it use to, it waits until 6th gear then its normal, will pull down on a hill shifts into 5th gear torque locked, down to 4th locked. The first thing that you need to know is the type of lockup system you are working with. #6 · Jul 10, 2011. How To Tell If Torque Converter Is Locking Up. Torque converters use a lock up clutch to create a true 1:1 connection between the engine and the wheels. So for the last two weeks ive been driving around with no tc lockup. 4. So basically in 1st, 2nd, and start of 3rd there will be about 200-300 RPM of TCC Slip. Torque converter shudder fells like a slight to heavy vibration in the transmission, and is usually accompanied by an interruption in power transfer. Its important to note that the converter clutch doesn't say locked on the upshift. For balancing reasons, the bolt pattern between the torque converter and the flexplate often-but not always-allows only one orientation of. This solenoid usually locks up the torque convertor (which acts like a clutch in an automatic transmission) when you are driving at a certain speed, and unlocks it when you press the brake, and/or come. #1. It feels like the transmission has 5 or 6 gears. ― Neil deGrasse Tyson. Think of the stator as a fluid manager, which multiplies torque as it directs fluid into the turbine. The problem is the TC stays locked up after driving out of. This cost is due mostly in labor - around 5-10 hours worth according to many mechanics - as the entire transmission must be removed from the vehicle in order to access and. . This keeps your Escape’s engine from turning at the right RPM for any given speed, which can really hurt fuel economy. Don’t be confused by the number “2” on the torque converter body. The light will go away after a while if you rememer to unlock the thing regurarly. Wendy M. -lbs. A removable computer chip called a programmable read only memory (PROM) is used. . Here's what they've done (in order): Replaced TC valve control solenoid - though this would fix problem - did not. The problem will feel much like a manual transmission vehicle stopping with the clutch engaged (pedal released). And no, we already established that the solenoid is working. A torque converter takes the place of a clutch in cars with an automatic transmission. : 300 x 2. #1. The e4od and 4r100 can both have tcc to come on in 1, 2, 3 and 4th all depending on throttle and speed. Quote:Thing is that it does lock up, it only locks up at certain speeds. This keeps your Santa Fe’s engine from turning at the right RPM for any given speed, which can really hurt fuel economy. I love all but two things about my truck and I believe they are related. The lockup clutch should be released well before the first downshift from 4th to 3rd. 1L V6 , front wheel drive, with 3 speed Torque Converter Lock-out type overdrive transmission. When this happens, your torque converter has a higher effective stall speed. The purple with yellow stripe wire could be shorted to any grounded part of the truck and that would keep the clutch on. Torque converters use a lock up clutch to create a true 1:1 connection between the engine and the wheels. obtained.