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 MANUALSPONTIAC19906000 LE, 4D SEDAN, 2.5 RREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMIDLE SPEED CONTROL (ISC) MOTOR (CADILLAC EXCEPT BROUGHAM)
1990 Pontiac 6000 LE, 4D Sedan, 2.5 R
Idle Speed Control (ISC) Motor (CADILLAC Except Brougham)
1990 Pontiac 6000 LE, 4D Sedan, 2.5 RSECTION Idle Speed Control (ISC) Motor (CADILLAC Except Brougham)
A malfunction in the ISC circuit will set a trouble code. For testing procedures, see appropriate TESTS W/CODES article. Also, see ISC minimum and maximum adjustment procedures in ADJUSTMENTS article.
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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.