overdrive or not to overdrive - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat

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overdrive or not to overdrive

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Old 03-11-2004, 12:27 PM
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Default overdrive or not to overdrive

what is this
i was driving to denver on saturday and about halph way the car went to drive and would not shift up but when i let off the go peddel it would act like it was hunting for a gear would drop to idel and then go to like 2000 rpm and just hunt around in thear up and down not staying in one rpm range
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Old 03-11-2004, 01:16 PM
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Pull codes using the procedure in Techinfo. All you need is a paperclip. Let us know what you find.

When was your last tranny service? You may be due for a full system flush.
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Old 03-11-2004, 07:54 PM
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What speed were you at? 10? 100?
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Old 03-11-2004, 08:24 PM
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yep on I-25 at 75 and after doing monument hill at 90 hehehe
but it is not the first time after i shut it down and let it set for a few minuets it acts normal
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Old 03-11-2004, 08:34 PM
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Well, if you shut it down and it acts normal, then its probably a computer malfunction.
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Old 03-12-2004, 10:31 AM
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Maybe a bad speed sensor. Mine some times will jump out off over drivegoing down the free way also. I heard the it is a characteristic of the 4lt60e
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Old 03-12-2004, 06:38 PM
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new tps and stedy needel no jumping
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Old 03-13-2004, 12:09 AM
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How hot was your car running?

I was driving a 92 sse once after having it looked at by my mechanic. Whole thing was crap, but when it got hot (over 200*) the tranny started slipping. It would accelerate to about 3000rpm in gear, then the car would hold that speed. The RPMS would waiver, and then go up, but the car would continue going the same speed. At one point I couldn't go above 30, which is good because on I-494 we weren't going faster then 30. I got a good half hour look at an old Malibu ss

I pulled over, let it cool, and it actually shifted and was transmissioning like it should So I finished taking it back to the owners. I told them what happened, and drove my family'* camry home.
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