C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

idle problem on a 1985

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Old Jul 6, 2007 | 04:11 PM
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Default idle problem on a 1985

hi,it idles fine 75% of the time but sometime its a little ruff.i have putt on new injectors,tp senser,fuel pump,plugs,wires,cap,rotor,mass air senser.i myself is looking at the idle air valve,but i have never done one of these and was wandering how best it is to do one?or if i am even close to the problem.thank for your time with this,mark
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Old Jul 6, 2007 | 05:30 PM
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Originally Posted by marks 85
hi,it idles fine 75% of the time but sometime its a little ruff.i have putt on new injectors,tp senser,fuel pump,plugs,wires,cap,rotor,mass air senser.i myself is looking at the idle air valve,but i have never done one of these and was wandering how best it is to do one?or if i am even close to the problem.thank for your time with this,mark
MAF. Disconnect it, reconnect it.
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Old Jul 6, 2007 | 07:28 PM
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i will try that,thank you for your time,mark
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Old Jul 6, 2007 | 10:55 PM
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Maybe brittle/cracked vacuum lines leaking or disturbed with all the parts you've been replacing on the top of the engine as well.
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Old Jul 6, 2007 | 11:14 PM
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Old Jul 7, 2007 | 01:32 AM
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
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Jumper diagnostic pins A & B (top right)

Turn key on, wait 30 seconds

Unplug idle air control (IAC) valve connector.

Remove diagnostic jumper.

Start car

Adjust idle set screw to 450 rpm

Shut car off

Plug in IAC connnector

Done.
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