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Base Engine Misfire with Coolant Consumption

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
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.
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