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Home >> Chevrolet >> 1996 >> Cavalier Z24, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Adjustments >> Idle Speed & Mixture >> Idle Speed

Idle Speed

NOTE: Idle speed is controlled by PCM and is not adjustable. Slight fluctuations in idle speed are considered normal. Start and run engine for at least 7 minutes to establish PCM control of idle.
NOTE: Incorrect idle speeds are normally caused by dirty throttle plate or vacuum leaks. Ensure all vacuum components are functioning properly.
  1. Idle speed is PCM-controlled. Resetting of IAC valve pintle is the only adjustment that can be performed. To reset IAC valve pintle position, turn ignition off.
  2. Disconnect negative battery terminal for 10 seconds to clear PCM memory. Reconnect negative battery terminal. Turn ignition on, then off. Start engine and check for proper idle operation. Repeat step 1) if proper idle operation is not obtained.
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