Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC1990GRAND PRIX STE, 3.1 VREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMIDLE LOAD COMPENSATOR (ILC)
1990 Pontiac Grand Prix STE, 3.1 V
Idle Load COMPENSATOR (ILC)
1990 Pontiac Grand Prix STE, 3.1 VSECTION Idle Load COMPENSATOR (ILC)
- With engine running and transmission in Park, hold throttle lever part way open and allow ILC plunger to fully extend. Apply finger pressure to ILC plunger. Using a hand-held vacuum pump/gauge, apply 20 in. Hg to ILC plunger.
- Plunger should begin to retract. If not, replace ILC plunger. If plunger retracts, observe vacuum gauge. Vacuum should hold for at least 20 seconds. If vacuum does not hold, replace ILC plunger.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.