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Usually spark plug carbon fouling is caused by either the fuel mixture [ratio of fuel to air] is too rich [too much fuel], OR it could be that crankcase oil is getting into the combustion chambers [cylinders].
Crankcase oil fouling is most often caused by either worn or broken "oil" rings on the piston, or on overhead valve engines, worn out valve-stem guides.
What else can I help you with?
What might cause a Chevy trailblazer from cranking after changing the spark plugs?
What huh?
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How do you change spark plugs on 2006 Chevy Impala 3.5l?
Spark plugs and wires
What would cause spark plugs to crack 1990 Chevy 350engine?
The only time I've seen cracked spark plugs was putting them in or taking them out with the socket not perfectly straight.
Are there spark plugs on a 2003 Chevy Trailblazer?
ALL gasoline engines have spark plugs. Only diesels don't have spark plugs.
How do you change spark plugs in a 2000 Chevy Impala?
Remove the spark plug wires from your 2000 Chevy Impala spark plugs. Remove the spark plugs with a 5/8 deep well socket by turning the socket to the left. Reverse the process to install the new spark plugs.
How do you change the spark plugs on a 2002 Chevy Trailblazer?
How do you change the spark plugs on a 2002 chavy trailblazer
How many spark plugs does a 2005 Chevy Impala have?
Both V6 engines have 6 spark plugs
How many spark plugs do you need for a 2.4L 2007 Chevy HHR LT?
4 Spark plugs
How do you replace the spark plugs on a 2004 Chevy Malibu Maxx?
Remove the spark plug wires from your 2004 Chevy Malibu spark plugs. Remove the old spark plugs with a 5/8 deep well socket, by turning the socket to the left. Reverse the process to install the new spark plugs.
How many spark plugs are in a 2003 Chevy Malibu?
It is a 3.1 Liter V6, so it has 6 spark plugs.
