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HOMESERVICE MANUALSPONTIAC2004GTO STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALENGINE MECHANICAL - 5.7LDIAGNOSTIC INFORMATION AND PROCEDURESBASE ENGINE MISFIRE WITH COOLANT CONSUMPTION
2004 Pontiac GTO Standard

Base Engine Misfire with Coolant Consumption

2004 Pontiac GTO StandardSECTION Base Engine Misfire with Coolant Consumption
Base Engine Misfire with Coolant Consumption

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.
  • Inspect for spark plugs saturated by coolant.
  • Perform a cylinder leak down test. Refer to Cylinder Leakage Test .
  • 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 .
  • Repair or replace as required.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.