Quote:
Originally Posted by tmoble
first pic, Dave is right about the brown ring.
second looks like it's burning a little oil to me too.
last pic does look a little lean,. but modern fuels typically don't give much color on the porcelain.
Dave, I'm not up on the term "pre-ignition fouling", what is that?
And yes again on the pics. Best plug pics I've seen in many moons.
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Those little black/gray dots on the plugs porcelain is from the fuel igniting from heat rather than spark so it burns and spatters the plugs, it may indicate the timing is to far advanced or the gas has a low octane or the alcohol content is higher than stated on the pump