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Misfire codes 306 316 ???

drhill

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Hi All - had some correct advice on this board last time I had an issue - so I thought I would ask again...after searching of course!

I have a rough idleing 2003 Lincoln Aviator that set the 306 and 316 codes for cyl 6 misfire and misfire at startup. I changed coil packs (even swaped them around) and same codes, no change in idle. pulled plug - looked good but swaped it with another cyl anyway - same codes.

Any ideas? I changed fuel filter 6 months ago and truck has 78k miles on it. All plugs were changed about 25k miles ago. seems to be isolated to #6 cyl? Maybe fuel injector? Not looking forward to swaping them - is there a good cleaner?

Thanks for any and all help!!
 






other misfire causes are bad injector(s) or intake leaks.
 






Yikes - finally eliminated the ignition coil as an issues and the fuel injector...must be the intake manifold? Would I need to remove it and reseal it?

Any other ideas?

Thanks!!
 






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