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Re: #1 and #4 are not firing I changed the coil pack and...
You said you changed the coil pack and the wires but didn't mention the plugs. Try moving one of the plugs to a different cylinder and see if the miss follows it. It could also be the ignition module. (the thing the coil packs mount to.)
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remove the spark plug wite off the plugs 1 at a time replacing right after testing each so as not to cross wire after one is off test it to see if its getting fire through the wire there is a light bulb like item that can be bought for testing wires at your local parts store if its not getting fire check your coil packs using the same tester and the wire adapter if those arent working there is a pick-up coil that the coil packs are mounted to its a small metal plate least on my car anyways most of the time those go bad and people thing the worst they are easy to change and fairly priced mine costed $38.00 at advanced auto
Firing order is 1, 5, 3, 6, 2, 4. Number 1 cylinder is up front. Why would you need the firing order, this engine does not have plug wires, each plug has its own coil pack, each coil pack is controlled by the computer.
had the same thing with my crown vic on the #8 cylinder. changed plugs and wires. still missing. wound up replacing the coil pack. you can check resistence of the coil between companion spark plug towers. ford marks each tower with 2 cylinder #'s. resisistence should be around 10-12 ohms
have you changed the ignition wires? perhaps firing order crossed? if not coil pack or ignition wires faulty how do you know it is not "FIREING" on 1 & 4 have you tested it with a spark tester tool???
You can try changing the coil pack and then recheck firing order of the wires to make sure they are in correct firing order. Suggest checking the wires first before spending money on the coil pack. Let me know how you make out.
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