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Home >> GMC >> 1983 >> Forward Control 5.7 M, Automatic, 475/M40 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Adjustment >> Tune-Up - 5.0L V8 VIN [H] >> Hot (Slow) Idle Rpm >> Hot Idle Speed Adjustment

Hot Idle Speed Adjustment

NOTE: See engine compartment Emission Control Tune-Up Decal to prepare engine for idle speed adjustment.
  1. Set ignition timing to specifications. Disconnect lead from idle speed solenoid (if equipped). Adjust curb idle speed to specifications using idle speed screw. Transmission should be in "D" if equipped with an automatic transmission, and in neutral for all others.
  2. Disconnect lead from air conditioning compressor. Reconnect lead at idle solenoid, then turn air conditioning "ON". Open throttle slightly to allow solenoid to fully extend. Adjust solenoid idle speed by turning solenoid screw.
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