causes misfiring. Remedy: Fit new spark plugs since cleaning the old ones is pointless. Formation of ash. Heavy ash deposits on the insulator nose resulting.
Appearance: Centre and/or ground electrodes are rounded and the gap is excessive. • Cause: General wear (spark plug has come to the end of its life).
Re: Ash deposits on sparkplugs Ford [Re: toeout] # If the ash didn't cause any problem as you ran the first set of plugs down to.
Lead fouling generally shows up as yellowish brown deposits on the spark plug's insulator nose. Lead fouling can cause your engine to misfire.
A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. Causes may include a stuck choke.
The plugs are lightly fouled with a hard white ash Not all oil-burning trucks leave huge sooty deposits on the plugs. I would do nothing.