Base Engine Misfire with Excessive Oil Consumption. Pontiac Firebird 2002

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2002 🢒 Firebird 🢒 Engine 🢒 Engine Mechanical - 3.8L 🢒 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. Refer to Spark Plug Inspection in Engine Controls.

•	Repair or replace as required.

Worn Piston Rings

Oil consumption may or may not cause the engine to misfire.

•	Inspect the spark plugs for oil deposits. Refer to Spark Plug Inspection in Engine Controls.

•	Inspect the cylinders for a loss of compression. Refer to Engine Compression Test .

•	Perform cylinder leak down and compression testing to determine the cause.

•	Repair or replace as required.