Re: Question about diagnosing engine malfunction with spark plug color. Please help.

Hi,

>Normal trouble-shooting would be, take care of things you see >first. Don't outsmart yourself. If #2 cylinder is like that then >check the injector by swapping or ignition wire. Soot means rich >or oil. >Tony > >Francis P. Gravel wrote: > >> Bill, Did the engine backfire at all with the bad injector ? >> >> bill wrote: >> >>> My 88 mitsu van has a rough idle and poor exceleration. All the >>> readings at the computer are correct. The O2 sensor is running in >>> tolerance and fluctating in the upper scale at .5 to .6. The plugs are >>> new (maybe 40 miles). Plugs from cyl 1, 3, and 4 are clean but they >>> have soot on the base. Number 2 looks like it was never used. I am >>> thinking that maybe the injector to thst cylinder is pluged. Would >>> that make the O2 reading show lean and force an over rich mixture on >>> the remaining cylinders. >>> >>
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bill
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Great to hear that it runs good again!

-Andy

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Andy

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