Trans Or PCM Prob? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-19-2005, 11:35 PM   #1
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Default Trans Or PCM Prob?

Lately my trans has been doing wierd things. A few days ago I gave the car half pedal @ 37mph and it hit 1st gear causing me to almost rear end someone. Did the same thing the next day with even less pedal. Then yesterday it was the total opposite. I went WOT @ 20mph and it shifted into second. Insted of kicking back down or at least holding second the trans went into third @ 35mph while I was still under WOT. The */c was whinning away to try to recover the bogged down engine.
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Old 06-20-2005, 12:09 PM   #2
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Have checked the level of the tranny fuild. When was the fuild changed last. My car didn't about the same thing but it had tranny coolant line leak.
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Old 06-20-2005, 12:40 PM   #3
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I'd agree, check the level.

Did the SES light come on during any of this? If so what are the codes?
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Old 06-20-2005, 04:23 PM   #4
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Fantastic 88, you will have to know whats going on with the PCM data to get an idea of where the problem may be... Sounds almost like the PCM is getting a confused TPS signal...

The PCM in your car is in totall control of the 4T65-E... If the trans is acting funky, as in not missing gears but shifting at the complete wrong time, Luging the engine, like the car has shiftitidis than hook a scantool up to it and see what kind of info you get from the TPS and VSS as well.... There may be some confusion for the PCM somewhere.. Good Luck

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Old 06-20-2005, 04:52 PM   #5
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Quote:
Originally Posted by jr's3800
Fantastic 88, you will have to know whats going on with the PCM data to get an idea of where the problem may be... Sounds almost like the PCM is getting a confused TPS signal...
The TPS sounded like it to me at first.

Maybe he could get nate to check it out?
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Old 06-20-2005, 05:30 PM   #6
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mine was doing that but now it isnt even shifting. I has no power and just hits the rev limiter. I think it is on its way out but i dont know. I am going to pray tonight it isnt because i dont have the money for it.
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