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BASE ENGINE MISFIRE WITH COOLANT CONSUMPTION BASE ENGINE MISFIRE WITH EXCESSIVE OIL CONSUMPTION assembly. Stuck valves Carbon buildup on the valve stem can cause the valve to not close properly. Repair or replace, as required. Excessively worn or mis-aligned timing chain Replace the timing chain and sprockets, as required. Worn camshaft lobes Replace the camshaft and valve lifters. Sticking lifters Replace, as required. Cut or damaged oil pump screen O-ring seal which may cause aeration of the engine oil Repair, as required. Refer to Oil Pressure Diagnosis and Testing. Improper operation of the camshaft position (CMP) actuator and/or control system Repair, as required. Refer to Camshaft Position Actuator and Solenoid Valve Diagnosis and Testing. Cause Correction Faulty cylinder head gaskets and/or cracking or other damage to the cylinder heads and engine block cooling system passages Coolant consumption may or may not cause the engine to overheat. 1. Inspect for spark plugs saturated by coolant. Refer to Spark Plug Inspection . 2. Perform a cylinder leak down test. Refer to Cylinder Leakage Test. 3. Inspect the cylinder heads and engine block for damage to the coolant passages and/or a faulty head gasket. Refer to Coolant in Combustion Chamber. 4. Repair or replace, as required. Cause Correction Worn valves, valve guides and/or valve stem oil seals 1. Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection . 2. Repair or replace, as required. Worn piston rings Oil consumption may or may not cause the 1. Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection .
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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