Vin 3, l w and are adjustable, here's how.
TUNE-UP - V6 -1988 Pontiac Fiero GT
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NOTE: On fuel injected models, engine idle speed varies. This fluctuation is considered normal, and should not be adjusted unless throttle body components have been replaced.
HOT (SLOW) IDLE RPM
IDLE AIR CONTROL VALVE
MFI, SFI & TBI
1. On 2.8L (except VIN 9), 3.0L and 3.8L engines, use an awl to pierce minimum idle stop screw cover. Apply leverage to remove cover. On all engines, ground ALDL diagnostic test lead. 2. Turn ignition on, but do not start engine. Wait 30 seconds. Disconnect Idle Air Control Valve (IACV) harness connector. Remove ALDL diagnostic test lead ground and start engine. Place auto. Trans. (If equipped) in "D". 3. Adjust minimum idle stop set screw to specification. See MINIMUM EFI IDLE SPEED chart. After adjustment, turn ignition off and reconnect IACV connector. Clear any trouble codes. Manual trans 600-700 Auto 400-450 in drive Vin S or W
500-600 in D. All othe vin's are not adjustable.
Wednesday, September 10th, 2008 AT 3:43 PM