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High Idle after Intake manifold gasket replacement 700

uid 55's pic
posted by  john sargent on  Thu Jun 27 07:51 CST 2002
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last visit: Wed Oct 22 09:07 CST 2014
[RELATED]

After you pay close attention to Chris Herbst's post, check the linkage rod from the throttle spool to the butterfly valve. If this rod is misadjusted it can hold the butterfly valve open and increase the idle speed.

You can test the Idle Air Valve by pinching the hose (either in or out hose) flat. Don't damage the hase, but pinch it hard enough to stop any air flow. If extra air is going through the Idle Air Valve, this will stop the air flow and the idle will drop to almost zero. If that doesn't stop the high idle, the problem is in the throttle linkage or throttle body.






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