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, 6.2 J, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCCC TESTS W/O CODESHESITATION, SAG, STUMBLEPOSSIBLE CAUSE & CORRECTION
1987 Chevrolet Step Van P20, 6.2 J, Standard
Possible Cause & Correction
1987 Chevrolet Step Van P20, 6.2 J, StandardSECTION Possible Cause & Correction
- Perform careful visual check.
- Check fuel pressure. See CHART A6 - FUEL SYSTEM PRESSURE TEST chart in the TBI TESTS/CODES article in this section.
- Check for water contaminated fuel.
- Check TPS for binding or sticking.
- Check fuel pump cycle system.
- Check ignition timing.
- Check alternator output voltage. Repair if less than 9 or more than 16 volts.
- Check for open HEI ground circuit No. 453.
- Check canister purge system.
- Check EGR valve operation. See EGR SYSTEM CHECK chart in the TBI TESTS/CODES article in this section.
- Check for incorrect or defective CALPAK or PROM.
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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.