GM Service Manual Online
For 1990-2009 cars only

Inspection

Action

DEFINITION: Base engine misfire with coolant consumption

Preliminary Inspection

Verify that there are no external coolant leaks. Refer to Symptoms - Engine Cooling .

Isolate Affected Cylinders

    •  Cylinder balance test with scan tool
    • Cooling system pressurization
    • Inspection of glow plugs
    • Compression test

EGR System Inspection

    •  Inspect EGR valve and intake system for evidence of coolant leakage.
    • Replace the EGR cooler if any problem is found.

Cylinder Head Gasket Leakage

    •  Remove cylinder heads of the affected cylinder bank and inspect for damage.
    • Replace components as necessary.

Cylinder Head or Engine Block Damage .

    • Inspect the cylinder head for cracks.
    • Inspect the cylinder block for damage.
    •  Inspect the cylinder block to head mating surface for straightness.
    •  Replace components as necessary.