88
MAINTENANCE
Spark Plugs
Spark Plug Inspection
Spark plug condition is indicative of engine operation. The spark plug
firing end condition should be read after the engine is warmed up and
the vehicle is driven at higher speeds. Immediately check the spark
plugs for correct color. See page 88.
CAUTION! A hot exhaust system and engine can cause burns. Wear
protective gloves when removing a spark plug for inspection.
1. Remove the cargo box access
panel.
2. Remove the air box cover.
3. Remove the spark plug cap.
4. Using the spark plug wrench
provided in the tool kit,
remove a plug by rotating it
counter-clockwise.
5. Reverse the procedure for
spark plug installation. Apply
anti-seize compound to the
spark plug threads.
6. Torque to specification. See page 87.
Normal Plug
The normal insulator tip is gray, tan or light brown. There will be few
combustion deposits. The electrodes are not burned or eroded. This
indicates the proper type and heat range for the engine and the service.
The tip should not be white. A white insulator tip indicates overheating,
caused by use of an improper spark plug or incorrect throttle body
adjustments.
Wet Fouled Plug
The wet fouled insulator tip is black. A damp oil film covers the firing
end. There may be a carbon layer over the entire nose. Generally, the
electrodes are not worn. General causes of fouling are excessive oil, use
of non-recommended oil or poor fuel quality.
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