Black Soot On Spark Plugs

Black Soot On Spark Plugs. Spark plugs can only be correctly read if the car has been shut down immediately at the end of a run without driving it back to the pits. As mentioned in the distributor section, the spark plug delivers the spark that causes the combustion in the cylinder.

Spark Plugs are totally black and sooty, dry runs rough
Spark Plugs are totally black and sooty, dry runs rough from www.hdforums.com

As the heat risers have a constant flow of exhaust they can get clogged with soot over the years and need to be cleaned out. Get off the track and coast to a place you are safely out of the way and either read the plug there or change one or two with some you have in your pocket so you can read these uncontaminated plugs when back. If the plug has a black or white soot, you need to go to the diagnostician, and if the plugs are different in appearance, and one of them may be with soot, and second may be wet, then you need to change all spark plugs.

Spark Plugs are totally black and sooty, dry runs rough

When i first purchased a briggs and stratton lawn mower, i honestly couldn’t believe it when it started hunting, revving up and down (surging) and chugging out black and white smoke. Spark plugs can only be correctly read if the car has been shut down immediately at the end of a run without driving it back to the pits. Bad spark plugs or wires. No matter what make or model your vehicle is, car seat covers are a must.