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{ An inaccurate MAF sensor { Fuel contamination - Refer to Alcohol/Contaminants-in-Fuel Diagnosis { Vacuum hoses that are split, kinked, or improperly connected Sensor/System Use a scan tool in order to monitor the knock sensor (KS) system for excessive spark Ignition System z Soak the secondary ignition system with water from a spray bottle. Soaking the z Test for proper ignition voltage output with the J 26792 Spark Tester. z Remove the spark plugs and inspect for the following: { Correct heat range { Wet plugs { Cracks { Wear { Improper gap { Burned electrodes { Heavy deposits Refer to Spark Plug Inspection . z An improper spark plug gap will cause a driveability problem. Refer to Spark z Determine the cause of the fouling before replacing the spark plugs. z Visually and physically inspect the secondary ignition for the following: { The ignition wires arcing to ground { The ignition wires for proper engagement to spark plug { The ignition coils for cracks or carbon tracking z Monitor the Misfire Current Counters while driving the vehicle in the conditions Engine z Inspect engine mechanical for the following: { Inspect compression - Refer to Engine Compression Test in Engine { Sticking or leaking valves { Worn camshaft lobes { Valve timing { Bent push rods
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls (Troubleshooting) - 4.8L, 5.3L, and 6.0L - Hummer H2
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