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Old 05-26-2009, 11:33   #1 (permalink)
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Question 01 F250 Miss-Fire on #2 (HELP) not as simple as you may think.

My 250 Started running rough just before winter and the "check engine" light came on. I went to Auto Zone and the code read "misfire on cylinder #2". I figured this would be a easy fix once it gets warms so I put her away for winter.

Fast-forward to now.

I Changed all the plugs (they were due) and re-set the codes. Well she started missing and running rough at idle and it said "misfire on cylinder #2" again.

Next: I swapped coil packs between 1 & 2, assuming if it was the coil pack the problem would move to cylinder 1. After a short amount of time driving the code tripped again and said "misfire on cylinder #2".

Next: Last night I swapped my fuel injectors between # 1 & 2, but the code tripped again and says "misfire on cylinder #2".

I'm out of ideas ...


Any help would be great..
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Old 05-26-2009, 13:31   #2 (permalink)
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Re: 01 F250 Miss-Fire on #2 (HELP) not as simple as you may think.

I'd put my money on the plug wires. If you want to test to be sure, swap out with #1 or #3, (just make sure you change them at both ends, obviously) If the code for misfires to the other cylinder, you know it's the wire.
I just went through this with my wifes car, the wire was sparking good, but was still the problem. [2 cents]
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Old 05-26-2009, 13:35   #3 (permalink)
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Re: 01 F250 Miss-Fire on #2 (HELP) not as simple as you may think.

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Originally Posted by thefonz View Post
I'd put my money on the plug wires. If you want to test to be sure, swap out with #1 or #3, (just make sure you change them at both ends, obviously) If the code for misfires to the other cylinder, you know it's the wire.
I just went through this with my wifes car, the wire was sparking good, but was still the problem. [2 cents]
Unless I'm missing something.. But I have no "Plug wires", only coil packs on each plug.
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Old 05-26-2009, 19:03   #4 (permalink)
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Re: 01 F250 Miss-Fire on #2 (HELP) not as simple as you may think.

Ok, difference between coil packs and coil on plugs (or COP's) I don't know about COP's. Hopefully someone else will chime in.
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Old 05-26-2009, 19:07   #5 (permalink)
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Re: 01 F250 Miss-Fire on #2 (HELP) not as simple as you may think.

I think you can use a noid light to test if the enjector is getting the signal or not.
Are the plugs wet or dry?
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Old 05-26-2009, 19:21   #6 (permalink)
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Re: 01 F250 Miss-Fire on #2 (HELP) not as simple as you may think.

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Originally Posted by thefonz View Post
I think you can use a noid light to test if the enjector is getting the signal or not.
Are the plugs wet or dry?
Thats next on the list, I'll be trying this later in the week when I have a free hour. I'm starting to think I may have a bad wire in the injector harness (the #2) and that could be the problem.

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Old 06-15-2009, 10:36   #7 (permalink)
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Re: 01 F250 Miss-Fire on #2 (HELP) not as simple as you may think.

Basic question and it may be insulting, but in other threads there has been confusion as to the cylinder location on the engine. Are you sure you know where #2 cylinder is located? You seem to have swaped out all that you can (Plug, COP, and even the Injector). The next thing is to ohm out the wires.
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