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Base Engine Misfire with Coolant Consumption

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
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 - Refer to Diagnostic Starting Point - Engine Cooling in Engine Cooling.
Coolant consumption may or may not cause the engine to overheat.
  • Inspect for spark plugs saturated by coolant. Refer to Spark Plug Inspection in Engine Controls - 5.3L.
  • 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.
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