Axiom 2WD V6-3.5L (2002)
Spark Plug: Testing and Inspection
Inspection and Repair
The spark plug affects entire engine performance and therefore its inspection is very important.
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Check electrode and insulator for presence of cracks, and replace if any.
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Check electrode for wear, and replace if necessary.
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Check gasket for damage, and replace if necessary.
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Measure insulation resistance with an ohmmeter, and replace if faulty.
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Adjust spark plug gap to 1.0 mm - 1.1 mm (0.0394 in - 0.0433 in).
NOTE:
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Do not adjust the spark plugs gap without new spark plugs.
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Do not damage to tip of spark plugs.
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Do not cleaning the spark plugs. If require the cleaning it due to heavy dirt, it is allowed only 20 seconds to be used spark plug cleaner.
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Check fuel and electrical systems if spark plug is extremely dirty.
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Use spark plugs having low heat value (hot type plug) if fuel and electrical systems are normal.
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Use spark plugs having high heat value (cold type plug) if insulator and electrode are extremely burned.
Sooty Spark Plugs
Much deposit of carbon or oil on the electrode and insulator of spark plug reduces the engine performance.
Possible causes:
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Too rich mixture
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Presence of oil in combustion chamber
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Incorrectly adjusted spark plug gap
Burning Electrodes
This fault is characterized by scorched or heavily oxidized electrode or blistered insulator nose.
Possible causes:
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Too lean mixture
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Improper heat value
