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Base Engine Misfire With Coolant Consumption

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. 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.
  • Perform a cylinder leak down test.
  • Inspect the cylinder heads and engine block for damage to the coolant passages and/or a faulty head gasket.
  • Repair or replace as required.
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