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102
MAINTENANCE
Spark Plugs
Spark Plug Recommendations
Refer to the specifications section beginning on page 124 for the recom-
mended spark plug type and gap for your vehicle. Torque spark plugs to
specification.
Spark Plug Inspection
Spark plug condition is indicative of engine operation. Check the spark
plug firing end condition after the engine has been warmed up and the
vehicle has been driven at higher speeds. Immediately check the spark
plug for correct color.
Normal Spark Plug
The normal insulator tip is tan or 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.
NOTE: 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 Spark 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 con-
sumption, use of non-recommended oil or incorrect throttle body adjust-
ments.
Plug Condition Torque Specification
New Spark Plug 12-15 N-m
Previously Installed Spark Plug 23-27 N-m