What does it means that a fine black powder builds up fast on my plugs and what should I do ? Thanks in advance
Plug reading
Aug 26, 2004
4 Replies
Sorry, it's a Nissan Sunny 1992 petrol ignition
A light black powder or soot buildup on the plugs is carbon fouling. It means you need what used to be called a tune up.
heavy black powdery build up on the plugs mean in is running rich (excessive fuel mixture)
could be any number of things causing it.
If it's a carburettor model then it could be the choke not releasing after the warm-up period, or a very dirty air filter, or a blocked small bore rubber pipe at the carburettor. Or you only use it for 1 mile journeys and there's nothing wrong with it that a 30 mile blast wouldn't sort out.
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required