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 MANUALSCHEVROLET1987CAPRICE CLASSIC, 4D WAGONREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMCARBURETOR - ROCHESTER E4MC/E4MEDESCRIPTIONIDLE STOP SOLENOID (ISS)
1987 Chevrolet Caprice Classic, 4D Wagon
Idle Stop Solenoid (ISS)
1987 Chevrolet Caprice Classic, 4D WagonSECTION Idle Stop Solenoid (ISS)
The solenoid is actuated by an ECM controlled relay for 2 operational modes:
- On A/C equipped vehicles, the idle stop solenoid is used to increase idle speed to compensate for A/C compressor load. When the climate control switch is moved to a position that turns on the A/C compressor, the ISS is energized and the plunger extends, to give a greater throttle opening, and maintain idle speed.
- On all applications, the solenoid plunger extends during certain deceleration modes for improved emission control. This action also occurs on A/C equipped vehicles, whether A/C switch is on or off. Specific adjustment procedure is included on the vehicle emission decal.
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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.