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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 55 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTS - 2.2L)FUEL SYSTEMS (GASOLINE)FUEL INJECTOR COIL TESTDIAGNOSTIC PROCEDURE
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Diagnostic Procedure
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE - GASOLINE article.
- Observe the ECT Sensor parameter using a scan tool. Is the ECT sensor parameter 50-90°F (10-32°C)? If yes, go to next step. If no, go to step 4.
- Remove the air cleaner outlet resonator. Measure the resistance of each fuel injector using a DMM. Is the resistance 11-14 ohms for each injector? If yes, go to FUEL INJECTOR BALANCE TEST USING SPECIAL TOOL or FUEL INJECTOR BALANCE TEST USING TECH 2 . If no, go to next step.
- Measure the resistance of each fuel injector using a DMM. Record each fuel injector resistance value. Subtract the lowest resistance value from the highest resistance value. Is the difference equal to, or less than, 3 ohms? If yes, go to FUEL INJECTOR BALANCE TEST USING SPECIAL TOOL or FUEL INJECTOR BALANCE TEST USING TECH 2 . If no, go to next step.
- Add all of the fuel injector resistance values to obtain a total resistance value. Divide the total resistance value by the number of fuel injectors to obtain an average resistance value. Subtract the lowest individual fuel injector resistance value from the average resistance value. Compute the difference between the highest individual fuel injector resistance value and the average resistance value. Replace the fuel injector that displays the greatest resistance difference above or below the average. After repair, go to step 7.
- Replace the fuel injector or fuel injectors with resistance that is not within 11-14 ohms. After repair, go to next step.
- Operate system to verify repair. Did you correct the condition? If yes, system is okay at this time. If no, go to step 2.
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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.