Reving up and down in park
Drifting
Joined: Sep 2005
Posts: 2,877
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Idle Air Control Valve (IACV) may be defective or gummed up w/ tar/dirt. Remove IACV and clean passages thoroughly while avoiding dousing the solenoid w/ throttle body cleaner. Also clean the throttle plate and throttle seat w/ throttle body cleaner. Check IACV for function by applying 12V directly to released connector contacts. You should hear a positive click or vibration when valve opens. If dead silence, you have a defective solenoid.
Other possibility is an air leak, PCV stuck open, damaged vacuum line, leaking intake manifold gasket, etc. Try spraying throttle body cleaner around suspect points and listening for a change in idle indicating the throttle body cleaner has been pulled into engine.
good luck
Other possibility is an air leak, PCV stuck open, damaged vacuum line, leaking intake manifold gasket, etc. Try spraying throttle body cleaner around suspect points and listening for a change in idle indicating the throttle body cleaner has been pulled into engine.
good luck
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