| Sooty spark plugs Question :
I have written. to you before, and I received advice on the causes of my
1991 Proton Saga consuming engine oil even after changing the piston rings
and grind valve. The engine is still consuming engine oil because the engine
has not been checked by the mechanic. Now, I have another problem. I have to
change the spark plugs every 3,000km because they get covered with black
soot (the mechan ics called it carbon). One mechanic attributed the cause to
the carburettor, and another mechanic said it was the engine causing the
problem.
Answer :
If the deposit is black but dry, it usually means
that your fuel mixture is too rich. If it is black but
oily, then it is a clear indication of oil consumption
and you will need to find out where the oil is coming from -- the pistons and rings, or the valve
guides. The sooty spark plug may not be related
to your heavy engine oil consumption. |
