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Re: Black spark plugs mean what?

> Check your ignition system too - from a discussion with Ned
> today, a cylinder which isn't firing can cause black plugs!

I tend to agree, I was running a little rich for a long time (black
pipe), my theory is that bad plugs not igniting all the fuel properly
leave some O2 in the exhaust.  The OXS picks up on the extra O2 and adds
*more* fuel to the mix - one misfiring cylinder would have the same

Huw Powell