misfire V-10
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Senior User
Joined: Apr 2003
Posts: 237
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From: ipswich USA
misfire V-10
I was plowing with my 2006 F350 V-10 this morning and 5 minutes after I filled the tank, the truck started to misfire badly. Blue smoke out the tailpipe, I could smell gas. It went on for several minutes, so I limped to a friends garage and pulled the codes. Cylinder 5 misfire, random misfire, Bank 1 rich, etc, etc. I shut the truck off for a few minutes to put the scanner back and on restart it runs perfect. I used it for another 2 hours and no porblems. Any ideas on the cause and why it came and went so suddenly? Do I need a coil on 5, I always figured, when a coil went bad it did so for good not come back to life. Thanks,
JWR
2006 F350 V-10 6 speed
JWR
2006 F350 V-10 6 speed
Cargo Master
Joined: Jan 2008
Posts: 2,566
Likes: 18
From: The Great White North!
Nope, many a coil known to do that while on the way out. Even known not to throw any codes while in the stages of going out.
I would start by pulling the COP off #5 and checking the boot out. Could be just water intrusion causing the problems. When boot is off, blow out the spark plug hole to check for debris. Make sure u use dielectric grease on the boot when replacing, or just replace the boot with a new one. In fact, might be a good idea to check out some of the other ones to.
I would start by pulling the COP off #5 and checking the boot out. Could be just water intrusion causing the problems. When boot is off, blow out the spark plug hole to check for debris. Make sure u use dielectric grease on the boot when replacing, or just replace the boot with a new one. In fact, might be a good idea to check out some of the other ones to.
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
It sounds to me like you somehow ingested some oil into your intake manifold. The blue smoke is a big clue. If you were really running a very rich mixture, the smoke would be black, not blue. Might have been a malfunctioning PCV valve. With the oil in the intake and getting sucked into the cylinders, of course you're going to see misfires, rich conditions and blue smoke. The poor PCM was doing everything it could to correct the mixture, which explains the error codes.
My advice is to just keep running the truck and watch for it to happen again. If it does, figure out where the oil is coming from and fix it. I'd start with the PCV or maybe looking for a failure in the intake manifold or manifold gasket.
My advice is to just keep running the truck and watch for it to happen again. If it does, figure out where the oil is coming from and fix it. I'd start with the PCV or maybe looking for a failure in the intake manifold or manifold gasket.
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Senior User
Joined: Apr 2003
Posts: 237
Likes: 2
From: ipswich USA
Thanks Guys
I think you guys are correct, the random misfire code and the blue smoke are key tips. The fact that it corrected itself leads me to doubt a coil failure. I have seen blue smoke on cold startups in the past. The truck only has 21k on it.
JWR
2006 F350 V-10 6 speed
JWR
2006 F350 V-10 6 speed
