8n running rough

Icuby · Apr 2, 2014

Not fireing right on #4 cyl. Has good spark [wire type plug wire] and 100lbs. compression. All others are fireing good. Have changed plugs,no difference. Any suggestions?? Thanks

NNP · Apr 2, 2014

swap the wire to make sure the problem doesn't follow the wire.
sometimes they look ok, but aren't.

any evidence of oil fouling on #4? common
an anti-fouler might help if engine is otherwise good.
put a spark checker between the plug and wire and run
the engine so you can watch the spark. random dropouts
of spark usually indicate some oil fouling.

8n running rough

Icuby

Member

NNP

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