Hombre S Regular Cab 4WD V6-4.3L (1999)
The following symptoms are characteristics of spark plugs that are running too hot:
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Fuel mixture is too lean.
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Heat range is incorrect.
If vehicle usage does not conform to normal driving conditions, a more suitable spark plug may be substituted.
If fuel and electrical system are normal, in most cases of this sort, the problem can be corrected by using a colder type spark plug with the same
physical dimensions as the original equipment spark plug.
3. Check the gaskets for damage and replace if necessary.
4. Measure the spark plug gap.
5. Adjust the spark gap by bending the grounded electrode.
