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Home >> Oldsmobile >> 1988 >> Cutlass Supreme SL, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Multi-Port >> Adjustments >> Minimum Idle Speed >> 5.0L & 5.7L

5.0L & 5.7L

  1. Pierce idle stop screw plug with an awl, and remove plug. With IAC motor connected, ground diagnostic lead.
  2. Turn ignition on. DO NOT  start engine. Wait at least 30 seconds. Disconnect IAC electrical connector. Disconnect distributor "Set-Timing" connector.
  3. On Corvette models, "Set-Timing" connector is located at left front of dash panel near the brake master cylinder. On Camaro models, "Set-Timing" connector is located at right rear of engine compartment taped to wiring harness. On both models the "Set-Timing" wire is a Tan/Blk wire.
  4. Start engine and allow to enter closed loop. Remove ground from diagnostic connector. Adjust minimum idle speed screw to obtain correct idle speed. See IDLE SPEED SPECIFICATIONS  table. Turn ignition off.
  5. Reconnect IAC connector. Check and adjust TPS. See THROTTLE POSITION SENSOR under ADJUSTMENTS  in this article.
NOTE: Anytime minimum idle speed is adjusted, the Throttle Position Sensor (TPS) must be readjusted.
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