LT1-LT4 Modifications 1993-97 Gen II Small Block V8

help! high idle, no shifting

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Old Nov 21, 2006 | 12:31 PM
  #1  
Soccerbum21's Avatar
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From: Statesboro/McDonough GA
Default help! high idle, no shifting

it's running about 2000-2300rpm at idle now.

left it running for about 15 min and it dropped to 1600.

it wont shift out of first, i have reverse and neutral, and if i really get on it it'll shift into 2nd.


i think i might be stuck in some wierd cold start mode in the computer, but i am not sure, and its really starting to **** me off and worry me at hte same time.


any suggestions?
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Old Nov 21, 2006 | 01:04 PM
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383_LT1_1295's Avatar
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im not sure but it sounds like it could be a vacum leak of some sort. I know on older cars there is a vacum line that runs from the intake to the transmission for shifting. That might be loose. But like i said thats on older cars. Not to sure about this.
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Old Nov 21, 2006 | 02:12 PM
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I agree, sounds to me like the vacuum line to the vacuum modulator valve has come off.
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Old Nov 21, 2006 | 03:33 PM
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Kinda sounds like limp mode to me... does it rev up and drive like ***?

If so, the chip is toast.
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Old Nov 21, 2006 | 05:16 PM
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We had the exact same problem a couple of months ago. We looked and looked for any vacuum leaks and it turned out to be the tps throttle position sensor. It is located on the throttle body and takes about 5 minutes to change. Our car didn't through any codes either. Just thought I would give a suggestion. Thanks Cindy
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Old Nov 21, 2006 | 06:05 PM
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From: Decatur, TN (N-W of Athens)
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Originally Posted by cnr2b1
We had the exact same problem a couple of months ago. We looked and looked for any vacuum leaks and it turned out to be the tps throttle position sensor. It is located on the throttle body and takes about 5 minutes to change. Our car didn't through any codes either. Just thought I would give a suggestion. Thanks Cindy
Ah yes, I suppose with a computer controlled Tranny, that would probably be the reason. Didn't think of that
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Old Nov 23, 2006 | 12:26 AM
  #7  
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try it mine did it too
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