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.
1985 Chevrolet Step Van P30, 7.4 W, StandardFACTORY OEM SERVICE PROCEDURE
Intermittent System Problems
- Check spark at 2 plug wires using Spark Tester (J-26792). If no spark occurs, go to ENGINE WILL NOT START procedure. If spark occurs from 1 or both spark plug wires, check pick-up coil with ohmmeter, Refer to testing pick-up coil in TESTING - COMPONENT TESTS .
- If pick-up coil is defective, replace it. If it is good, check for dwell increase from high to low RPM. If dwell did not increase, replace electronic module.
- If dwell did increase, and trouble is not found, check fuel, coil and plug wires, also cap and plugs.
Factory Service Tools
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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.
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