Base Engine Misfire with Excessive Oil Consumption

/ 9-5 (9650) / 2010 / 2. Engine / Basic engine, 4-cylinder diesel / Fault diagnosis, fault symptoms / Base Engine Misfire with Excessive Oil Consumption

Cause	Correction
Worn valves, valve guides, and/or valve stem oil seals	• Inspect the spark plugs for oil deposits. • Repair or replace as required.
Worn piston rings Oil consumption may or may not cause the engine to misfire.	• Inspect the cylinders for a loss of compression. Refer to Engine Compression Test . • Perform cylinder leak down and compression testing to identify the cause. • Repair or replace as required.

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