That makes sense. Hopefully, I will have some better news here in the near future.
6.7 Powerstroke Diesel Injectors failing at low mileage?
- Thread starter mbacfp
- Start date
They would need a scope and know how to use it for interference. Being a dealership, I’m guessing no one there knows how to use one.
The most rudimentary test you can do is just check for excessive AC voltage. That can be done with a DVOM.
Checking grounds is easy.
Spoke with service advisor and he checked Ford Hotline and they are saying try another injector (assuming #5 for P1555). I replaced #5 injector and pigtail and tech also installed another injector (not sure if new or not) and to see and code still appeared. Getting nervous Ford Engineering is running out of ideas?
He asked me if I had any def contamination in the fuel...which of course is a no.
Getting a little worried again....
What a mess...
Might need to make a cross country drive to @mattd. Truck thankfully runs great and all seems good...maybe will just have to live with codes? Crazy...
Figured I would also run this by everyone. If Ford cannot figure this out and I am forced to live with this issue...what is a fair solution money wise?
Apparently Ford will not allow them to reinstall old PCM...as I asked to avoid having either of us eat its cost. Assuming wiring harness isn't coming back out due to labor intensity.
So, is it fair to pay for the parts (at dealer cost and ask them to cover the labor?
Don't want to screw anyone...prefer a fair arrangement? What do you all think?
Need to check invoice, but believe PCM total was around $2,200. Once they figured out PCM didn't fix it...asked if I would pay the additional $500 for wiring harness which is what that would have cost.
Tech is going to put in another injector tomorrow morning, per Ford Engineering. Will pick up before the weekend whether fixed or not.
Not sure what is next...
Apparently Ford will not allow them to reinstall old PCM...as I asked to avoid having either of us eat its cost. Assuming wiring harness isn't coming back out due to labor intensity.
So, is it fair to pay for the parts (at dealer cost and ask them to cover the labor?
Don't want to screw anyone...prefer a fair arrangement? What do you all think?
Need to check invoice, but believe PCM total was around $2,200. Once they figured out PCM didn't fix it...asked if I would pay the additional $500 for wiring harness which is what that would have cost.
Tech is going to put in another injector tomorrow morning, per Ford Engineering. Will pick up before the weekend whether fixed or not.
Not sure what is next...
It seems that they left all decisions to engineering as far as diagnostic path. Not sure I agree with that, but it seems it is what it is. At this point they are throwing parts at it it seems.
I would definitely ask them to waive labor at minimum. You’ve paid a lot of money and have gotten no where.
I would definitely ask them to waive labor at minimum. You’ve paid a lot of money and have gotten no where.
Kinda of surprised they are back to that. Getting concerned they will have nothing more to do. Will know more tomorrow when I pick up. Maybe we are at the end of the line? Is what it is. Appreciate the help and support.
My initial thoughts are to pay for the wiring harness. Kind of annoyed Ford won't let them put original PCM back in, thus forcing its cost to someone. Assuming they will contact Ford Engineering for further ideas...so will wait and see before bringing the bill up. Don't want to burn them as I believe they have acted in good faith.
Sometimes the code is either P1555 (most of the time) or P1555 & P1558 (occasionally).
Are there any common grounds/wires, etc. that are shared or tied to both injector #5 & injector #8? I told tech this but not sure if he has personally seen both (I thought I left the error showing both).
Hoping that would maybe give a better clue???
They each have their own dedicated circuits. But they are both located on the driver side bank. The only thing electrically in common is the ECM grounds to chassis, and then chassis to battery. Being a motorhome does add complexity. They do what ever they want with wiring. That’s why I suggested checking all grounds. Or electrical interference from an outside source.
I would be curious about all injector circuit resistance, including the injectors themselves, not just what the ECM is pointing fingers at.
This isn’t normal and not something you should just have to live with.
I assume they programmed the IQA codes for the injectors when they replaced the injector and the ECM
See page 33
https://www.fordservicecontent.com/ford_content/catalog/motorcraft/DOBDSM1401.pdf
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If ECM ground issue...wouldn't that not show up as an injector code?
I can only hope they did a lot as they submitted everything to Ford Engineering.
Not my specialty...trusting they know what they are doing along with Ford Engineering.
Will keep you all updated. Throwing new injector in first thing tomorrow before I pick up before the weekend.
Hoping for the best...but doubtful. Another new injector doesn't make any sense to me? Already tested two new ones before wiring harness.
Night all.
Understood. I'll mention it and see what they say.
Hope you have a great Friday. Appreciate everything.
@mattd
I got to thinking about things and wanted to run this by you. Could the truck batteries be going bad or compromised enough to cause this? I'm assuming dealer checked them? They are 3-4 years old.
Short code(s) only show up on restart...once started and codes deleted alternator is providing stable power (current) and they never come back on until next restart when batteries do their job, thus irritating the PCM on #5 and sometimes #5 and #8 injectors?
I checked all connections myself per your suggestions and nothing looked wrong...but maybe batteries compromised somehow?
House batteries are bad and was thinking about preemptively changing truck batteries at the same time and that got me thinking about this. Could it be this simple?
Figured I would throw this out. Not a tech so my understanding of how it all works might be wrong...figured I would share.
Have a great night all.
P.S.
Saw this...
I got to thinking about things and wanted to run this by you. Could the truck batteries be going bad or compromised enough to cause this? I'm assuming dealer checked them? They are 3-4 years old.
Short code(s) only show up on restart...once started and codes deleted alternator is providing stable power (current) and they never come back on until next restart when batteries do their job, thus irritating the PCM on #5 and sometimes #5 and #8 injectors?
I checked all connections myself per your suggestions and nothing looked wrong...but maybe batteries compromised somehow?
House batteries are bad and was thinking about preemptively changing truck batteries at the same time and that got me thinking about this. Could it be this simple?
Figured I would throw this out. Not a tech so my understanding of how it all works might be wrong...figured I would share.
Have a great night all.
P.S.
Saw this...
- Low voltage during startup, which stresses the electrical system.
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Low voltage can cause strange behavior for electronics.
Load test the batteries and see what you find. Many times low voltage codes will be stored in different modules if the batteries are indeed that weak, but anything can happen
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