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spark retard activity. Ignition System z Inspect for proper ignition voltage output with the J 26792 Spark Tester. Refer to z Remove spark plugs and check for the following: { 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 secondary ignition for the following: { Ignition wires arcing to ground { Ignition wires for proper routing z Soak the secondary ignition system with water from a spray bottle. Soaking the z Monitor the Misfire Current Counters while driving the vehicle in the conditions z Inspect for loose ignition coil grounds. Refer to Electronic Ignition (EI) System Engine z Inspect engine mechanical for the following: { Compression - Refer to Engine Compression Test in Engine Mechanical. { Sticking or leaking valves { Worn camshaft lobes { Valve timing { Bent push rods { Worn rocker arms { Broken valve springs { Excessive oil in combustion chamber or leaking valve seals - Refer to Oil z For incorrect basic engine parts. Inspect the following: { The camshaft - Refer to Camshaft and Bearings Cleaning and
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls (Troubleshooting) - 4.8L, 5.3L, and 6.0L - Hummer H2
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