Over Drive Problem - 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 06-30-2005, 01:49 AM   #1
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I have a 92 SSEi the car shifts throght all the gears 1-OD but about 10min after the car shifts into OD, it just jumps back to 3 and stays there till I restart the car.

I have no clue what the problem is, all I know it the car is a gas pig on the highway

Does anyone have an idea???
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Old 06-30-2005, 02:38 AM   #2
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Check your fluid level? Getting any SES light?
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Old 06-30-2005, 03:03 AM   #3
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does it vary with speed or anything?
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Old 06-30-2005, 03:18 AM   #4
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The fluid was the first thing I thought of, but it'* full. The car runs good and no matter what the speed is is does it every time it goes in to overdrive. I read in a repair book it may be do to a faulty ground on the transmission, is it possiable?
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Old 06-30-2005, 07:32 AM   #5
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These cars are known for ground issues. It is very possible.

EDIT: Ground issues are possible, are there any other symptoms?
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Old 06-30-2005, 12:16 PM   #6
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There is no other problems at all, everything works good, Where would I finf the ground for the transmission??? A friend showed me one place on the top side of the transmission but the wires are like new, I'm really stumped
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Old 06-30-2005, 12:44 PM   #7
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There was a reported problem related to the transmission'* electrical connector, but I don't remember where I read it - there may have been a technical service bulletin (TSB) about that.
You should also check for error codes. There may be a TCC solenoid code or something else.
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Old 06-30-2005, 01:39 PM   #8
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The quad driver has me thinking thast the TPS is failing.... But you will want to know what the PCM is seeing and doing...

There is a possibility that you may have a bad ground... But I'm not so sure about that one...

Some tranny shops will give you a free diagnostic on the problem...

Good Luck

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Old 06-30-2005, 02:05 PM   #9
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Like JR is saying, it'* a tough one. Mainly because as he mentions the PCM might be seeing something else and making the tranny do funky stuff.
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