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 .

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.