HT4100 4.1, 4.5, 4.9 Discussion, 93 deville running great in Cadillac Engine Technical Discussion; Hey everyone I have a 1993 cadillac sedan deville that has 105,000 miles on it it's been running great the ...
Hey everyone I have a 1993 cadillac sedan deville that has 105,000 miles on it it's been running great the only thing is that 10 months ago i had the trans rebuilt and now the torque converter locks up way to early at like 27MPH the car shifts great and everything just the torque converter locks up way to early and no codes what could it be thanks everyone!
I'm not sure if 27mph lockup is abnormal or not, as my '90 Eldo locks up around the same speed if I'm driving it VERY easy. Anyway...
TCC lockup is usually determined by coolant temp, vehicle speed, brake switch (closed for lockup), transmission line pressure and TPS angle. Coolant temp and vehicle speed requirements are programmed into the PCM. A faulty brake switch could only PREVENT lockup, not initiate it early. Same goes for inadequate line pressure. The TPS or faulty speed info to the PCM are the only adjustable variable here.
Be sure that the TPS is correctly adjusted and working properly. Make sure that your speedo is correct.
...ill bring it back to aamco monday and tell them about it
Oh God, there's your problem I hate AAMCO
Don't let them fool around till the warranty expires (they will try). They buy cheap Chinese built torque converters that are almost NEVER machined right, I had one in a Plymouth tranny they built that blew the replacement tranny 11 months into the warranty and had to sue them for recovery. When it was pulled apart my trans tech showed me the hub was .033 out of round! Told me AAMCO has a truck load of return (faulty) torque converters for every 2 truck loads that come in.
yeah i know the thing shifts fine and everything just the torque converter locks up to early i hear that if that happens to much it will burn up the forth clutches because of the trans locking and unlocking creating so much heat
Ive bought it to them about 5 times seriously called BBB called AAMCO consumer affairs and nothing gets done i keep fighting with them but tell me it's normal when it not and in august the warranty expires only one more month left im gonna make them fix it somehow i will find a way!
Get an independent second opinion from at least two other shops (not AAMCO) and then go back to AAMCO with the results. It may be nothing, but I seriously doubt it. GM designs a tranny that runs forever and AAMCO can't rebuild it to last a year?