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

Lt1 problem

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Old Jun 4, 2012 | 10:35 AM
  #1  
1995 Z28's Avatar
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Default Lt1 problem

Lt1 1594xx miles m6

But when I'm coasting what ever speed with the clutch pushed in the rpms will go from 1300 to 900 then back to 1000-1200 it will just kinda bounce around.
What could this be? Normally it sits at 1300 when coasting with the clutch pushed in.
At a light it will sit at 1k idle.
Could it be a vacuum leak? If so where should I most likely check?
No engine lights either.
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Old Jun 5, 2012 | 06:53 PM
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Anyone?
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Old Jun 5, 2012 | 10:19 PM
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Sounds like a Vac. Leak. Typical culprit is Intake gasket. But, could be anywhere.
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Old Jun 6, 2012 | 10:26 AM
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Check the volts on the tps sensor c what it reads sound like the problem I had. Found out I had wires melted together back inside the black plastic going along the pass. Of the intake
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Old Jun 6, 2012 | 10:36 PM
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How erratic is it? They sound like subtle changes. Does it sound like its missing, then surging?
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Old Jun 8, 2012 | 11:12 AM
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It will ge at 1300 then drip to700. Then surge up to 1k or 1100 then it goes back. Its not a everyday thing it happens maybe every other day or every few. I'll try to get a video.

So check out wires around the tps?
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Old Jun 10, 2012 | 07:56 PM
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I would pull out and clean or check the voltage on the IAC valve.
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