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Old May 26th, 2009, 01:22 PM   #1
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Default 5.4 misfire question

My buddys 2001 E250 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 anyway) 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 the code would move to cylinder 1. After a short amount of time driving the code tripped again and said "misfire on cylinder #2" still.

Next: this weekend I swapped my fuel injectors between # 1 & 2 once again seeing if the code would trip on #1 but the code tripped again
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Old May 26th, 2009, 04:47 PM   #2
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Start with a compression test, if you have good compression it is probably something in the wiring.
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Old May 26th, 2009, 04:51 PM   #3
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try switching the plug wires between two of them and see what it does
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Old May 26th, 2009, 04:55 PM   #4
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i vote for plug wires if they weren't changed with the plugs. i'll bet thats where your problem is
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Old May 26th, 2009, 05:06 PM   #5
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There are coil on plug, no wires, if he changed the coil the plug boot would have gone with it.
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Old May 26th, 2009, 06:15 PM   #6
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He is going to start checking wiring to coils...
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Old May 26th, 2009, 11:26 PM   #7
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Use a noid light to check the injector pulse, take measurements of coil resistance and make sure they are close together. Compression check is also a good avenue to check after coil and injector.
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Old May 27th, 2009, 01:06 AM   #8
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Quote:
Originally Posted by Kodiak450r View Post
i vote for plug wires if they weren't changed with the plugs. i'll bet thats where your problem is
and you charge people to work on thier cars? haha thats funny
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Old May 27th, 2009, 10:14 AM   #9
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you should replace all plugs and Coil on plugs at the same time. when one goes bad the rest are soon to fallow. but because it didnt go to plug one when you changed it im going to guess something in the wireing for the COP on #2 is bad.
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Old May 27th, 2009, 11:26 AM   #10
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and you charge people to work on thier cars? haha thats funny
sorry i was thinking of chevys now shut up.
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Old May 27th, 2009, 03:40 PM   #11
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Quote:
Originally Posted by Kodiak450r View Post
sorry i was thinking of chevys now shut up.
what, didnt read the 'FORD' on the title of this section? Could be a coil, or that springy thing in the plug boot could have a break in it
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Old May 27th, 2009, 04:23 PM   #12
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Ok, so you've ruled out fuel injector and COP by doing the cylinder swap. That leaves a couple of "simple" things, all of which have been mentioned.

1. "Noid light" the injector, which you'll have to go and rent/buy the light kit from your local parts shop. It plugs an LED into the injector harness and will blink if the PCM is sending the injector driver signal. If the light is on solid or not on at all, you've got injector harness issues.

2. Not sure if you have access to an oscilliscope or not, but you can hook that to the signal wire of the COP (coil) and see if you're getting a pulse there. You'll know you've got the right wire if you're getting a pulsed signal. If you're getting a "flat-line" on both wires, you've got wiring issues with the COP harness.

3. Compression test. Make sure you don't have a head gasket leak, broken ring, etc. Pain in the ass, but do at least the cylinders next to the problem cylinder. Greater than a 10-15% difference indicates a problem.

Troubleshooting:
Fuel Inj or COP: Disconnect the harness from the coil/ injector and find the wire that has ~12v with the Key On (engine off). That is your VPWR line. If your engine runs, that's not the problem. The OTHER wire, on both components, is your signal wire. You've already determined that there is a problem there, but you need to figure where the problem lies.

-If you have a repair manual with wiring harnesses, you'll be in good shape. Otherwise, you won't get a full check. In either case, turn the key off and disconnect the engine harness from the PCM (ECM, "computer" what-have-you). Put your voltmeter negative lead on the negative to the battery and put the positive on the SIGNAL wire of the coil/injector. If you've got voltage, you've got a short to power somewhere. Good luck chasing it. Flip your multimeter over to Ohms and leave the leads where they are. If it's anything but open, you've got a short to ground. Take the negative lead and put it on the VPWR (the other wire in the coil/injector connector) and measure the resistance between the two wires. If you've got any sort of reading there besides open, the two wires are shorted to each other somewhere.

If you have a factory manual and can figure out where in the PCM harness the other end of the wires is, check resistance between both ends. If you get anything more than ~15ohm, or if you get an open reading, you've got a break in the wire somewhere.

If you've done your open and short checks and the wiring is ok, you can suspect that you've got a bad PCM at that point. The coil or injector driver circuitry might have gone bad, making it so that the component never fires. Sadly, that requires changing the PCM, as there's no repairing that circuitry (unless you're DAMN good).

Compression test:
Can't help you here. Then again, if you've made it this far, you probably have a good idea what's wrong and how to fix it.

Good luck!!
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Old May 28th, 2009, 01:36 PM   #13
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my guess is when u did the wires for the plugs u connected the wrong wires on the distrubtor and the wrong 1 on that plug and put the rite on 1 that has the same timing as the other
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Old May 28th, 2009, 01:57 PM   #14
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Quote:
Originally Posted by mydeadcherokee17 View Post
my guess is when u did the wires for the plugs u connected the wrong wires on the distrubtor and the wrong 1 on that plug and put the rite on 1 that has the same timing as the other
Its coil on plug, 1 coil per plug, wires going to the coils are not long enough too hook up wrong.
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Old May 28th, 2009, 02:48 PM   #15
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Thanks for the info, looks like he will be trouble shooting tomorrow evening... I'll pass on the findings...
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