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Home >> Cadillac >> 1980 >> Eldorado 5.7L Eng VIN 8 >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Digital Fuel Injection >> Adjustments >> Idle Speed Control (ISC)

Idle Speed Control (ISC)

  1. Run engine to normal operating temperature. Remove air cleaner assembly. Accelerate engine to 1500 RPM and disconnect TPS harness connector. Engine "OFF", ISC plunger should be fully extended.
    Fig 1: Throttle Body - Throttle Side
    G09343011Courtesy of GENERAL MOTORS COMPANY
  2. Disconnect ISC harness connector and start engine. Set engine speed to 2000 RPM by turning hex on end of ISC plunger.
  3. Repeat steps 1)  and 2)  if adjustment was necessary to recheck proper operation of ISC. TPS may need adjustment if idle speed is too low. Reconnect harness connectors and install air cleaner assembly.
    NOTE: Enter diagnostics, clear trouble codes and exit diagnostics after each adjustment procedures to clear ISC malfunction code. This code may be set from disconnecting ISC during adjustment procedures.
    TIGHTENING SPECIFICATIONS

    Application Ft. Lbs.
    Throttle Body Mounting Screws 15
    Temperature Sensors 15
    Fuel Filter 15
    Fuel Pump INCH Lbs. 55