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Idle still riduculously high, here's what i've done. . .any ideas? 200 1987

posted by  someone claiming to be Rhys on  Mon Sep 1 15:12 CST 2003 [RELATED]

It might be an idea to remove the inlet hose to IAC valve and tape the fitting on the valve. Fire the engine up. If the idle is then low, the IAC valve is open, and that proves that everything else is OK. If the valve is commanded to open it may be that it is receiving power from a bad ground someplace - just how to find that I don't know. Otherwise it may be stuck in the open position. Best to prove that the excess air is entering through the IAC first. If the idle remains high while the fitting is taped off, then you have a second source of air - no amount of ignition timing will give you 3000 RPM. That means the air controls for the HVAC, or the brake booster, or intake manifold.





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