Base Engine Misfire with Coolant Consumption (1)

Engine Mechanical - 5.3L L84 or 6.2L L87 | Diagnostic Information and Procedures | Document ID: 5003260 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.	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.