Quote:
Originally Posted by 57NAPCO
“With the IAC passage completely plugged the engine should barely be able to idle, fully warmed up with all accessories off.
If it still idles fast with the IAC passage plugged there is a vacuum leak somewhere. Extra air getting in the engine will speed up the idle. Check all the vacuum hoses.”
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The IAC passage you're trying to plug in that procedure is on the top of the throttle body. The IAC is just a controlled vacuum leak from the top of the throttle body to below the throttle blades. By removing the IAC you created a huge vacuum leak. That's why the rpm shot up so high.
This is part of the IAC reset procedure in the link posted above:
1) With the IAC valve connected, ground the diagnostic (ALDL) terminal (same as you would do to flash trouble codes thru the check engine light).
2) Turn ON the ignition, but do NOT start the engine. Wait at least 30 seconds.
3) With the ignition still on, disconnect the IAC electrical connector.
If you stop right here, you should be able to look into the IAC passage on the top of the throttle body and see the end of the IAC pintle as this procedure drives the IAC fully closed. If you can't see the end of the pintle, you've probably found the source of your high idle as the IAC is not fully closing and cannot control your idle.