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Home >> Oldsmobile >> 1989 >> Custom Cruiser >> Repair and Diagnosis >> Engine Performance >> System >> Carburetor - ROCHESTER E4MC 4-Bbl >> Testing >> Idle Load COMPENSATOR (ILC)

Idle Load COMPENSATOR (ILC)

  1. Ensure cap located on end of ILC is good condition. Vacuum leakage will occur if damaged. Open throttle, allowing ILC plunger to extend. Apply finger pressure to plunger.
    NOTE: Plunger is not connected directly to the diaphragm and will not retract without applying light finger pressure when vacuum is applied.
  2. Using vacuum pump, apply 20 in. Hg vacuum to ILC. Note vacuum reading and plunger operation. Plunger should retract and vacuum should hold for at least 20 seconds. Release vacuum and plunger should extend. Replace ILC if plunger did not extend or failed to hold vacuum.
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