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Coolant in Combustion Chamber

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Coolant in Combustion Chamber

Cause Correction
DEFINITION: Excessive white smoke and/or coolant type odor coming from the exhaust pipe may indicate coolant in the combustion chamber. Low coolant levels, an inoperative cooling fan, or a faulty thermostat may lead to an "overtemperature" condition which may cause engine component damage.
  1. A slower than normal cranking speed may indicate coolant entering the combustion chamber. Refer to Engine Will Not Crank - Crankshaft Will Not Rotate .
  2. Remove the spark plugs and inspect for spark plugs saturated by coolant or coolant in the cylinder bore.
  3. Inspect by performing a cylinder leak-down test. During this test, excessive air bubbles within the coolant may indicate a faulty gasket or damaged component.
  4. Inspect by performing a cylinder compression test. Two cylinders "side-by-side" on the engine block, with low compression, may indicate a failed cylinder head gasket. Refer to Engine Compression Test .
Faulty cylinder head gasket Replace the head gasket and components as required. Refer to Cylinder Head Cleaning and Inspection  and Cylinder Head Replacement .
Warped cylinder head Replace the cylinder head and gasket. Refer to Cylinder Head Cleaning and Inspection .
Cracked cylinder head Replace the cylinder head and gasket.
Cracked cylinder sleeve Replace the components as required.
Cylinder head or block porosity Replace the components as required.
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