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 MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 26 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 6.5L DIESEL)FUEL SYSTEMGLOW PLUG CONTROLLER
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Glow Plug Controller
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Glow Plug Controller
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, and 1994 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure coolant temperature is less than 80°F (27°C) before beginning test. Place ignition switch in RUN position and allow glow plugs to cycle. After 2 minutes, crank engine for one second. It is NOT important that engine starts. Return ignition switch to RUN position. Glow plugs should cycle on at least once.
- If glow plugs do not cycle, disconnect controller (controller is located on top rear of valve cover). Connect a 12-volt test light between Pink/Black wire terminal of harness connector (terminal "A") and ground. See Figure. With ignition switch in RUN position, test light should be off. Test light should glow when engine is cranked.
- If test light does not glow as specified, repair short or open in engine harness Pink/Black wire. If test light operates properly but glow plugs do not cycle, replace controller.
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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.