LEMON Manuals: Even more car manuals for everyone
Home >> Oldsmobile >> 1990 >> Toronado Base, 4T60/ME9 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments - V6 >> Idle Speed

Idle Speed

NOTE: Incorrect idle speeds are normally caused by dirty throttle plate or vacuum leaks. Ensure all vacuum components are functioning properly.
  1. Install "Scan" tester to ALDL test connector (located under driver's side dash). Start and run engine to normal operating temperature. Observe IAC counts. See MINIMUM IDLE SPEED table.
  2. If IAC counts are incorrect, use an awl to pierce minimum idle stop screw cover. Apply leverage to remove cover. Turn idle stop screw out until screw clears linkage. Turn screw in until screw touches linkage. Turn screw in an additional 1 1/2 turns.
  3. Turn idle stop screw in to decrease IAC counts. Turn screw out to increase IAC counts. If minimum idle speed correction requires more than 1/2 turn of idle stop screw in or out, check for vacuum leaks or dirty throttle plate. Clear any trouble codes.
MINIMUM IDLE SPEED

Application IAC Counts
All Models 10-20
scientia non olet · About LEMON Manuals