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Misfire cyl 5, fixed/not fixed

  #1  
Old 12-13-2017, 06:03 AM
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Misfire cyl 5, fixed/not fixed

hard to create a good thread title sorry. Hereís the story.

As you all know I recently had a misfire bugging me. I took it to a Ford dealer and they diagnosed misfire #6. (Yes, #6. Stay with me). I donít remember if/what codes were present. They showed me a printout indicatin cyl 6 was dead. Driver side front- should be easy.

So I changed all 10 spark plugs with Autolite brand. Also I replaced the COP boots and springs. Turns out my plugs were factory original (!) and had over 300,000 miles on them, and had worn to over .100Ē gap and all had crusty stuff on them.

Everything seemed great to the best of my memory. LOTS more power. Honestly I think I had V8 power levels for the last couple years, but now it feels like V10 power
Then after driving a bit I noticed a similar misfire. I was very busy so I ignored it. But it got worse and very annoying.

I pulled the codes and it showed P0305. Passenger side rear. Easy on a van. I changed it with a new Autolite.

Drove around nicely for for a short time but then it starting missing again. I pulled the codes. P0305 again. Ok fair enough- I swapped the coils 4 and 5.

Seemed to run fine for a while and now itís missing again and showing P0305 again.

*how is it that Iíve replaced the plug twice and swapped the coils, and still have the same cyl misfire? please advise. I want that V10 smooth and powerful again.
 
  #2  
Old 12-13-2017, 07:27 AM
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Then it isn't the plug or coil causing the misfire. It could be the injector or even something in the cylinder. A bad valve, or valve seat, or low compression could also cause this.
 
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Old 12-13-2017, 11:42 AM
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How old are the coils? I don't even mess around with changing boots or springs, I replace the whole unit because of how inconsistent the misfires are. I gotta change plugs and coils on my boss's V10 van in a couple weeks. I ordered all 8 red coils for $30 shipped. They look identical to the MSD ones I put in my van for $175. I swear they are probably the exact same manufacture. Now I know, everyone's thinking for $30 for all 10 shipped there's gotta be something wrong. But I'm willing to try. The parts store ones are $50 each and they don't last but 2 years and have a 400% markup. I also got OEM Motorcraft platinum plugs for $40 shipped.
 
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Old 12-13-2017, 05:19 PM
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Originally Posted by Im50fast View Post
... Seemed to run fine for a while and now it’s missing again and showing P0305 again.

*how is it that I’ve replaced the plug twice and swapped the coils, and still have the same cyl misfire? please advise. I want that V10 smooth and powerful again.
You have ruled out the plug and COP.
There's also wiring, connectors and the PCM grounding circuit.
Since it's intermittent I would guess electrical.
Something mechanical would be bad all the time unless it can stick.
A wire with a couple of strands left unbroken, a loose connector or a bad chip in the PCM can be intermittent.
Check all the ground cables, too.
 

Last edited by R&T Babich; 12-13-2017 at 05:27 PM. Reason: typo
  #5  
Old 12-13-2017, 05:59 PM
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Did you clear the codes in between? I wouldn't rule out the coils at all. Just cause you moved around the coils doesn't mean anything to me. I've had so many inconsistent misfires that I just replace them all. Even had misfires that weren't on the cylinders coded. I've had some that wouldn't even throw a code but I could feel it was missing only under load.
 
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Old 12-13-2017, 07:39 PM
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I would look very closely at the connector. Each time you disconnected the COP you corrected the problem for a short time. If you don't find anything, look for a wire that could be moved when you are changing a plug or COP.
 
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Old 12-14-2017, 11:30 AM
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Like others have already said, check the wiring. Every time you mess with it, it works for a while, and then starts to misfire again. Especially check the injector connector. A little corrosion in it will cause this. Every time you're right there moving the injector and COP wiring, it starts to work again.
 
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Old 12-15-2017, 11:51 AM
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And! It always runs rough when cold. By cold I mean ambient. Whether 70 degrees or this morningís 45 degrees.

Im gonna check the wiring today.
 
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Old 12-15-2017, 12:06 PM
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Originally Posted by Im50fast View Post
And! It always runs rough when cold. By cold I mean ambient. Whether 70 degrees or this morningís 45 degrees. ...
So it runs rough when first started until the engine warms up?
Idle, accelerating, cruise?
What year, does it have an IAC and has it ever been checked?
 
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Old 12-15-2017, 05:21 PM
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Originally Posted by R&T Babich View Post
So it runs rough when first started until the engine warms up?
Idle, accelerating, cruise?
What year, does it have an IAC and has it ever been checked?
Op has a van so it is a 2 valve and has an iac.
 
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Old 12-15-2017, 07:18 PM
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Yeah it has a medium/small misfire at all times, but it runs especially rough when cold.

I checked the wiring today and all is good. Looks good, and doesnít change idle when I wiggle it.

Today I saw the fuel regulator vacuum line had disconnected itself. 2nd time Iíve discovered that now.
For some reason this web site wonít let me post a pic.
Iíll keep trying.

Im not sure if it has a IAC. It does have some electrical thing on both sides of the throttle body.
 
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Old 12-15-2017, 07:45 PM
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Old 12-15-2017, 10:04 PM
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That hose may be shot on the end...are those missing exhaust manifold studs??
 
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Old 12-16-2017, 12:31 PM
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yeah thats missing studs. I'm a bit concerned about the white stain comings from it. Wondering if it's coolant or something.. that stains coincides with the "unfixable" misfire cylinder 5. I'm hoping it's not some terrible news.
 
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Old 12-16-2017, 02:52 PM
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must be god's will
 

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