95 mercury grand marquis firing order of spark plug wires

HERE'S A LINK TO YOUR WIRING ORDER. Specifications Firing Order AutoZone com

Check compression, but make sure you put injector in the right spot. Also double check firing order. Also gap on plugs. Did you drop one maybe?

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

maybe the wires got mixed up? Check firing order against the diagram below.

Firing order 1-3-7-2-6-5-4-8 --------- front ' 1 2 3 4 ' of ' 'distributorless ignition vehicle ' 5 6 7 8

I got code PO 305 on a 2002 Mercury Grand Marquis, what is the spark plug wire part called
This will have a direct coil over ignition with a coil over each spark plug. The coil is the electrical part over the spark plug. The coil also has a rubber part that is called the boot or spark plug boot. The boots can be purchased separately but the coils will come with new boots.

is it #5 coil,

Have you checked to see if there is any spark coming out of the number 5 coil?



and should I replace the coil and spark plug and what should the spark plug be gapped at?

When was the last time the spark plugs where changed? It may be due for all the spark plugs to be changed. The spark plug gap is usually listed on the emissions sticker under the hood. It should be .050 - .056 or very close to that.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Depending on your Grand Marquis's mileage...it sounds like plug wires and plugs...(worn out) and or engine timing/firing order? If plug wires recently changed...the spark plug wires are in the wrong firing order...confirm the firing order from your local parts store by phone...and retrace each one...always start with #1 cylinder...hope this helps.

Mercury Grand Marquis 4.6 liter V-8 VIN "6" Mercury Grand Marquis 4.6 liter V-8 VIN "W"

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

For the 4.6L V8:
Firing Order:
1-3-7-2-6-5-4-8
Cylinders:
(back of engine)
4-----------8
3-----------7
2-----------6
1-----------5
(front of engine)

Let me know if this helped...

Check you've reinstalled the wires to the correct cylinders - if you've got this wrong, then you'll have problems.
Off hand, I'm afraid I don't know your cylinder order however - sorry, you'll have to check a manual for that one (unless someone else on here knows it off the top of their head?)
Hope this helps, Sherwin