Need help. Faster dealer 30 miles away is 10 days out for first appointment for me which I signed up for. Others within 100 miles are much worse.

2015 350 dually with 62k miles. Only earlier engine issues were #3 injector replaced and a lot of intermittant low fuel rail pressure codes ultimately fixed with flash 18+ months/25k miles ago.

In the last 3 weeks/250 miles, truck has been missing intermittently, at first only once in the week. But now about every 3rd time I use the truck it runs rough. Very rough idle on some of these ocassions. Starts within 1 minute of starting the truck, by which time truck is over 105 degrees here in Florida. Often, if I stop, turn off engine, remove key, open door and close again, then restart, it will run just fine for the rest of the 10-20 minute drive; other times i have to do this more than once. If running rough will continue to do so for 30+ miles. This was first event and when I learned that restarting might fix it temporarily. At firstm 3 weks ago, rough running maybe 10% of Starts. Now about 60% of the time it will run rough after hits 105 or so degreesF.

When running rough - no check engine lights at all 95% of tge time. Only had 3 check engine lights come on. Only once during driving rough. Twice the check engine came on immediately after i restarted because of rough running, surprisingly it was not running rough. I have not cleared the P1267 code, but after about 5 restarts, the check engine light goes off with code kept in memory. I do believe that after the second rough event without check engine light, that I did check codes and P1267 was in register, but not absolutely certain that I did not check until the check engine lifpght came on several days later.

when I say rough, it feels like driving on the curbside rumble strip and then some, much worse when accelerating or rims below 1300, downshifting helps mask the miss.

Fuel filter only 10k miles, draining fuel clear. Battery terminals clean. 14 months/12k miles ago I had issues with wiring harness by emergency brake (camera not functioning) but problem has not returned since I zip tied the harness out of the way of brake mechanism.

Obviously plans must change with not pulling my 5er in this condition unless someone of has an idea to try before I can get into dealer.

 

This almost sounds like a stuck EGR valve to me.

On Edit, this is the code I come up with

P1267 Cylinder #7 High To Low Side Short G

 

Senix,

Even with code translation, with recent writeups I was thinking EGR except it does not go away at sustained speed.

thanks,

 

update.

In shop 7:00 AM Mondat July 2. Bad injector diagnosed and dealer ordered Tuesday July 3 before holiday with inventory showing 42 in stock. When it did not show up late yesterday July 5, status showed as backordered. Put onto "emergency order vehicle not drivable" late yesterday. Part did not show up today and Dealer can only hope that it will show up Monday. Apparently an emergency order can come from anyplace and Dealer has no way to track or guesstimate it's arrival.

one can only hope that part has been found somewhere and will be on the way shortly.

 

Thanks for reporting back. Just in time supply chain management.

 

Update.

in on Monday July 2, out Tuesday July 10 with new injector for cylinder #7.. I have driven 200 miles since. While that was mostly two 85-mile highway trips, there have been a dozen restarts and all seems ok.

 

took along time for them to get that repaired, but glad it is running good now.

 

Good afternoon Everyone, In reading other posts, I also am searching for some answers/directions to some of these questions...

I have a 2012 F350, EGR repaired and intact, 152K original miles, that presented with a misfire, rough idle and my simple code reader gave an P0206-cylinder 6 issue.
Truck was taken to a Ford Dealership repair, THEY "discovered" it was injector 7-I had my doubts but they have the high end equipment, so I went with the "professionals" and #7 was changed along with
both fuel filters. On the way back home-NO CHANGE in drivability, ran like Hell .. Returned it to the shop the next day, NOW they say it was injector #6 that was showing bad with #2 overcompensating for the "missing".
I have paperwork showing the process/testing for their $3000 software program. Ok, throwing good money after bad, injector 6 was replaced-AGAIN, ABSOLUTELY no change.
truck runs really well at times, and then at times sputters and misses but it is worse when she is at about 2000rpms. She will not accelerate past that point.
Dealership contacted Ford "professionals" who wanted to rule out the PCM-line to injector 6 is good, 12 volts flowing-little light stayed constant and bright and then they decided that it was valve train and
needed to take the engine out to " see if that was the problem". I have that group of letters also. I said no, $2500 for 2 injectors and a STILL NOT REPAIRED truck was enough.
AT NO TIME DURING THIS PROCESS/ISSUE HAS THE CHECK ENGINE LIGHT COME ON.. I discovered the P0206 code by just doing a random check.
I am at a loss on what to check, where to go other than reach out to this group.
Last option is to get rid of it and I am really partial to that truck ..
Any help you guys can give me or a direction to look would be appreciated.

 

Litag65,

Hopefully someone with more knowledge will reply.

I have no idea if our diesel injectors have coils as being described in this you tube.

https://www.google.com/url?sa=t&rct=...z3OZoWaKpve84f

It that case it was a wiring ground issue not the injector. If one ground is bad only logical that the others are right behind.

The P0206 code you saw may have been an historical code from much earlier than when you noticed the misfire, but if that was the only code you read, it was probably a result of that misfiring. That code that may have been accidentally deleted by the dealer before they read the codes in memory. I had that happen to me on an 08 with an exhaust sensor, but not on the injector issue. In that one instance if hadn’t left rig running with the check engine light on for dealer to see, they would simply tell me to come back when a code light was on.

So sometimes if you plug in or unplug a reader with ignition on strange things can happen (codes shouldn’t but can be erased). A 7 versus a 6 injector I do not understand but maybe 6 truly was acting up when they read it, and for some reason your P0206 had been erased, and they did not run it long enough for the P0206 to show up also.

Good luck.

 

Thank you, I will give that a check.