View Full Version : Uh oh

11-07-2007, 07:43 AM
hard white deposits on a spark plug? That's not burning coolant is it? Hopefully it's just a sign of too much advance on the timing?

11-07-2007, 09:07 AM
I think too much advance usually makes the insulator white and the electrodes will either be blued or burned. White deposits are usually a contaminant.

11-07-2007, 09:16 AM
By the way this is on all 4 plugs to a greater or lesser degree.

11-07-2007, 09:23 AM
Age of plugs? Any vapor showing at the tailpipe in the morning (more than usual these cold mornings)? Smell of coolant?