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.
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedFACTORY OEM SERVICE PROCEDURE
Engine Control System & Fuel System - 4.8L, 5.3L, Or 6.0L - Troubleshooting & Diagnosis
- Symptoms - Engine Controls
- Malfunction Indicator Lamp (MIL) Diagnosis
- Engine Cranks but Does Not Run
- Powertrain Relay Diagnosis
- Poor Fuel Fill Quality
- Fuel Injector Diagnosis (w/J 39021 or Tech 2)
- Fuel Injector Diagnosis (w/CH 47976)
- Fuel Pump Electrical Circuit Diagnosis
- Fuel System Diagnosis
- Fuel Composition Diagnosis
- Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool)
- Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool)
- Electronic Ignition (EI) System Diagnosis
- Evaporative Emission System Diagnosis
- Inspection/Maintenance (I/M) System Check
- Inspection/Maintenance (I/M) Complete System Set Procedure
- Inspection/Maintenance (I/M) System DTC Table
- Service Bay Test
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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