My check engine light came on so i took it in to the auto parts store and got it scaned they said it was a misfire on cylinder 7 i havent had a tune up so i changed out all the spark plugs the check light came back on after about 30 miles took it back they said #7 misfire again so i got a coil pack and boot and again light came back on and was #7 misfire again took it all apart checked everything i dont see a problem but still got check light and rough idle scan says #7 misfire whats next 2002 lincoln navigator
You've tried everything but getting the timing checked out. You've done all the other parts of a tune-up but that.
When you changed the spark plugs did you notice #7 was especially dirty or greasy, this could point to a seal being broken or a piston ring that needs replacing.
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I didnt see any thing on the #7 plug or any plug but some yellowing at the base of the porcilin looked clean it only got 60k miles kind of worries me how does the computer determin a misfire on a certian cyl what sensor it use? i can feel a miss or rough idle could it be a injector? or would that be a diff code on the scaner
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