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High Idle - 92 z28 5.7

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Old Mar 25, 2012 | 05:11 PM
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colohusker's Avatar
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High Idle - 92 z28 5.7

My son's 92 z28 with the 5.7 wouldn't pass emisions after getting it back together. In researching that issue, there were three injectors that were different than the others, no part numbers on any of them, and 2 of what I think were the original injectors were leaking as well. The engine is a .30 over stock build.

Ordered a set of Accell 150821 injectors, that are supposed to be a direct replacement according to Summit. Got everything back together, and the idle is high at 2500 RPM.

Any suggestions on what to look at?
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Old Mar 25, 2012 | 05:30 PM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: High Idle - 92 z28 5.7

Originally Posted by colohusker
Ordered a set of Accell 150821 injectors, that are supposed to be a direct replacement according to Summit. Got everything back together, and the idle is high at 2500 RPM.

Any suggestions on what to look at?
Vacuum leak.

RBob.
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Old Mar 25, 2012 | 06:43 PM
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colohusker's Avatar
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Re: High Idle - 92 z28 5.7

Thanks, I thought that might be an issue, but haven't been able to hunt it down using starting fluid. Guess I'll tear it down again and try to reseal the plenum and runners.

A related question, does anyone sell a bolt kit for the upper intake/plenum and runners to the manifold?
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Old Mar 28, 2012 | 11:20 AM
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From: under the hood of my car in Massachusetts
Car: 92 rs daily driver work in progress
Engine: 3.1 , 204/214 cam
Transmission: 700 r-4, b& m megashifter
Axle/Gears: I want a posi with rear discs
Re: High Idle - 92 z28 5.7

Before tearing down, have you done a smoke test yet?
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