spark plug problem
#1
#10
i experienced the same problem
the coil was not firing that spark plug very often , even the spark was very weak
turns out there was a huge amount of carbon build up in that cylinder , the hard carbon on the piston head was closing the plug gap
take a long shaft screw driver and gently scrape the carbon off of the piston directly under the spark plug hole
you better start using seafoam to clean out the cylinder
some 08 to 10 4.0l cylinder had spark plugs that were not threaded in completely thus causing incomplete combustion in that cylinder
the coil was not firing that spark plug very often , even the spark was very weak
turns out there was a huge amount of carbon build up in that cylinder , the hard carbon on the piston head was closing the plug gap
take a long shaft screw driver and gently scrape the carbon off of the piston directly under the spark plug hole
you better start using seafoam to clean out the cylinder
some 08 to 10 4.0l cylinder had spark plugs that were not threaded in completely thus causing incomplete combustion in that cylinder
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