2001 mercury grand marquis reading code misfire p305 but spark plugs and coils changed but still reading code p305
If you changed the #5 Coil then the code was wrong
You get lots of wrong codes on a ford, as a bad coil
spikes the pcm when grounding out to fire the coils
secondary side
Try putting the old coil back & walking the new one to
another cylinder,may take many days & many miles of
driving to get it fix,but better than a shop guessing, because
they hate fords
SOURCE: misfire on cyl no 1 on a 01 merc grand marq
Run your tests before you start buying your parts. verify that your fuel pressure is acceptable. a defective fuel pressure reg., clogged fuel filter, tired fuel pump, fuel injector, loose or damaged wiring to the injector or coil, maybe water in the gas or too much fuel cleaner/additive.
SOURCE: misfire in cylinder 1 2001 mercury sable
Next change swap the injector with another and see of the problem moves. If it does it's a bad injector.
SOURCE: 2000 mercury cougar is hestating when you step on
a multiple misfire code can relate to a fuel problem check filter pump pressure let me know alan wrench
SOURCE: 1998 Mercury Grand Marquis. Check Engine light on
is not ford,driverside front close to rad #1,and then2,3,4 [same side]and pass. side front 5,6,7,8 [if only 6cyl you have 123and 456?
Testimonial: "thanks"
SOURCE: own a 1997 mercury grand marquis. went to change
The 4.6 does not have an traditional distributor. This year engine should have two coil packs located on the front of each valve cover. Each coil pack controls four cylinders. Some of the plug wires will cross over the front of the engine in a wire loom on top of the alternator. The spark plugs are located down in the intake manafold. they run beside the fuel rail on each side of the intake manafold where it joins to each head. You will need an extention at least 8 to 10 inches long to get at the spark plugs. The plug wire fit snuggly into the intake manafold and have an extention on them that connects to the spark plug.
Testimonial: "thanks, that's just what i needed to know "
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