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Re: lock up converter shudder ? when I apply reverse and...
If you can find the lead that operates the lockup solenoid in the transmission, you could cut it, but I would not recommend that. Likely the converter has an internal failure. Further operation can cause more fine metal (from broken part) contamination to circulate into transmission and damage can be costly!!!
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1st to second sounds like a forced shift i would check the 1-2 shift solenoid inside the transmission and make sure the speed sensors are all in good working order, clean and apply electro grease to plugs on the transmission , as for the idle problem it could be many things from sensors for the engine to a torque converter lockup solenoid need more info is the check engine light on? you said it shudders is it missing or has a surging idle ( high and low) does it die when it goes low idle or stay running
P0740 JEEP - Torque Converter Clutch Circuit Symptoms - Engine Light ON (or Service Engine Soon Warning Light) - Transmission shift shock - Vehicle may not shift into the highest gear
Possible causes - Low transmission fluid level - Dirty transmission fluid - Faulty torque converter clutch solenoid valve - Torque converter clutch solenoid valve harness or connectors - Torque converter clutch solenoid valve circuit is open or shorted
When is the code detected? Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.
P0740 JEEP Description The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. 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.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
todays trannys partly electronic-so 1st scan vehicle at a parts place--cud hav an issue with the planetary gear set but a solenoid used for shifting or a relay may failin-also a transmision control module--other internal parts like torque converter or pump-a pressure chec mite be considered
They way you replaced fluid is bad, you should of done a bg service, by dropping the pan theres still oldoil ,the converter is full and the lines and the cooler and inside trany, then when new fluid is added the cleaners in it loosen all the dirt and seend it through the trany, the bg flushes 100% of the old fluid so no mixing of old contiminated and new oil is taking place.
HI, It may seem obvious, but sometimes overlooked.... have you checked the oil level, as low oil can cause some strange things to happen! My 96 4 liter would be reluctant to move sometimes, but after I topped it up, it has been fine.