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Fuel System z Inspect both injector fuses for being open. An open injector fuse causes 4 z Inspect for incorrect fuel pressure. Refer to Fuel System Diagnosis . z Inspect for a contaminated fuel condition. Refer to Alcohol/Contaminants-in- z Inspect the fuel injectors. Refer to Fuel Injector Coil Test . z Inspect for the following that may cause the engine to run rich: { Water intrusion in the heated oxygen sensor (HO2S) connector { Engine oil contaminated by fuel { An evaporative emission (EVAP) canister purge condition { Incorrect fuel pressure - Refer to Fuel System Diagnosis . { Leaking fuel injectors - Refer to Fuel System Diagnosis . { An inaccurate mass air flow (MAF) sensor { Blockage on the inlet screen of the MAF sensor - Refer to Mass Air { Vacuum hoses that are split, kinked, or improperly connected { An air intake duct that is collapsed or restricted - Refer to Air Cleaner { An air filter that is dirty or restricted - Refer to Air Cleaner Element z Inspect for the following conditions that may cause the engine to run lean: { Water intrusion in the HO2S connector { An exhaust leak between the HO2S and the engine - Refer to Exhaust { Vacuum leaks { Incorrect fuel pressure - Refer to Fuel System Diagnosis . { Restricted fuel injectors - Refer to Fuel Injector Balance Test with { An inaccurate MAF sensor NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls (Troubleshooting) - 4.8L, 5.3L, and 6.0L - Hummer H2
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