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 MANUALSCHEVROLET1990G 20 VAN V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESDIAGNOSIS BY SYMPTOMDIESELING/RUN-ON
1990 Chevrolet G 20 Van V8-350 5.7L
Dieseling/Run-On
1990 Chevrolet G 20 Van V8-350 5.7LSECTION Dieseling/Run-On
Definition: Engine continues to run, after key is turned "OFF," but runs very roughly. If engine runs smoothly, check ignition switch and adjustment.
- Check injector(s) for leaking. Apply 12 volts to fuel pump "test" terminal to turn "ON" fuel pump and prime fuel system.
For a single tank system, see CHART A-5. Chart A-5 Fuel Pump Relay Circuit Diagnosis (One Fuel Tank)
For a dual tank system, see CHART A-5A. Chart A-5A Fuel Pump Relay Circuit Diagnosis (Two Fuel Tanks)
- Visually check injector and TBI assembly for fuel leakage.
- Check injector(s) for leaking. Apply 12 volts to fuel pump "test" terminal to turn "ON" fuel pump and prime fuel system.
For a single tank system, see CHART A-5. Chart A-5 Fuel Pump Relay Circuit Diagnosis (One Fuel Tank)
For a dual tank system, see CHART A-5A. Chart A-5A Fuel Pump Relay Circuit Diagnosis (Two Fuel Tanks)
- Visually check injector and TBI assembly for fuel leakage.
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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.