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Base Engine Misfire with Excessive Oil Consumption - LE5 or LE9

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 spark plugs for oil deposits.
    • Inspect the cylinders for a loss of compression. Refer to Engine Compression Test : LE5 or LE9 .
    • Perform cylinder leak down and compression testing to determine the cause.
    • Repair or replace as required.
   


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