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volvo Workshop Repair Guides


V90 L6-2.9L VIN 96 B6304S (1998)

Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 1296

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Spark Plug: Testing and Inspection

Spark Plug Inspection

1.

Inspect the spark plugs for:

a. Improper gap
b. Carbon deposits
c. Cracked center electrode insulator
d. Burned or worn electrodes (may be caused by):

^ Excessive mileage
^ Lean fuel mixture
^ Advanced ignition timing
^ Loose spark plug
^ Plug heat range too high
^ Insufficient Cooling

e. Fouled plug (may be caused by):

^ Rich fuel mixture
^ Retarded ignition timing
^ Oil in combustion chamber
^ Incorrect spark plug gap
^ Plug heat range too low
^ Excessive idling/low speed running
^ Clogged air cleaner element
^ Deteriorated ignition coil, coil wire or ignition wires

2.

Replace the plug if the center electrode is rounded.

3.

Adjust the gap with a suitable gapping tool.

Electrode Gap:

0.028-0.032 in.

Engine, Cooling and Exhaust > Engine > Tune-up and Engine Performance Checks > Spark Plug > Component Information > Specifications > Page 1296

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