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Continuing Idle Issue ... can not get down past 760 RPM w/ IAC disabled 200 1988

posted by  machine man on  Sun Sep 1 23:01 CST 2013
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last visit: Wed Oct 22 15:40 CST 2014
[RELATED]

I must be missing something here but is it not the idle specification for the engine to idle at 750 RPM normally? That should be listed in the decal on the shock tower for timing and such.

That's what all my LH cars do? The ECU controls it through the Idle Air Control Valve. If the A/C is on it might get bumped a wee bit by the IACV.

If you ground the wire (blue wire not the pink on the fender. I think you should check your manual on that) to the IACV. It should then drop idle underneath its control value and idle strictly on the air passing through the throttle plate only. 500 to 600 rpm.
That is unless you have a black knob on the throttle body which is technically obsolete starting in about 1985.
That can be totally shut down, if the stop screw for the throttle plate is set to just stop the throttle plate from jamming in the bore and not holding the plate open for extra air, which by the way, thats when it is, maladjusted!

Take a step back, turn around twice and go through it again. You might be good already!

Phil






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