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 MANUALSGMC1984VALUE VAN P3500, 5.7 M, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISENGINE PERFORMANCEIGNITION SYSTEMIGNITION SYSTEM - HEI-EST (CALIF)TESTINGINTERMITTENT OPERATION CHECK
1984 GMC Value Van P3500, 5.7 M, Automatic, 400/M40
Intermittent Operation Check
1984 GMC Value Van P3500, 5.7 M, Automatic, 400/M40SECTION Intermittent Operation Check
- Connect spark tester to 2 different spark plug wires, and crank engine. If no spark, perform Ignition System Check. If spark occurs at either or both wires, check for dwell increase from low to high RPM.
- Check pick-up coil. Replace, if faulty. If pick-up coil is good and dwell did not increase, replace HEI-EST module. If good, but dwell increased, check fuel system spark plug wires, distributor cap and plugs.
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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.