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

Running Bad

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Old 02-09-2014, 03:42 PM
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I have a 96 Vette, it's running real bad. It's idling up and down when the car warms up.
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Old 02-09-2014, 08:58 PM
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I change the plugs and wires in the car.
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Old 02-09-2014, 10:18 PM
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If it's hunting it could be a vacuum leak.
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Old 02-10-2014, 12:18 AM
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I will look into that.
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Old 02-10-2014, 02:28 AM
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It only surges when the car is warm? If it runs fine when it's cold then try unplugging the MAF to keep it in open* loop, then warm it up and see if the problem persists.
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Old 02-10-2014, 06:22 AM
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Originally Posted by Catmaigne
It only surges when the car is warm? If it runs fine when it's cold then try unplugging the MAF to keep it in closed loop, then warm it up and see if the problem persists.
I will try this when I get off work.
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Old 02-10-2014, 11:16 AM
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Oops, I meant to say open loop.

But if it runs fine when cold and acts up when warm then it could be a EFI issue. I had a similar problem when an O2 sensor went. Car ran like crap in closed loop after warming up but was fine cold.
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