Uh oh

[subzali]

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?

 

[MDH33]

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.

 

[subzali]

By the way this is on all 4 plugs to a greater or lesser degree.

 

[Red_Chili]

Age of plugs? Any vapor showing at the tailpipe in the morning (more than usual these cold mornings)? Smell of coolant?