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 21 (ENGINE CONTROLS - BASIC TESTING - GASOLINE)C-4, BASIC IGNITION SYSTEM CHECKSHEI-EST DISTRIBUTORDISTRIBUTOR PICK-UP COIL SHORT & RESISTANCE CHECKS
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Distributor Pick-Up Coil Short & Resistance Checks
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Distributor Pick-Up Coil Short & Resistance Checks
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Rally Camper Special, 1994 GMC Rally, and 1994 GMC Forward Control. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect pick-up coil leads from module. Using ohmmeter, check pick-up coil resistance. Connect ohmmeter to distributor housing and either pick-up coil lead (step 1 in illustration). See Fig 1. Flex pick-up coil leads by hand to check for intermittent short to ground. If reading is not always infinite, replace pick-up coil.
- Connect ohmmeter between pick-up coil leads (step 2 in illustration). See Fig 1. Check for intermittent open by flexing wires and connectors. If resistance is not 500-1500 ohms, replace pick-up coil.
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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.