Had an injector #1 reading P0263 Circuit contribution/Balance Fault.

Replaced injector. Truck ran fine for a day, then it started to idle and run really rough again.

Fuel pressure is 60 psi.

New fuel filter.

Just changed oil.

Oil level is good.

FICM is reading 48 v on startup when cold.

What could be the issue? I'm not buying more injectors. I may just sell the truck and get out of it. Unless someone can give me any ideas for tracking down why this would happen. I checked the injector electrical connection and it was fine, no chaffing. Is there a way to check it with a multi-meter too?

Please help!

 

Could be mechanical, like a toasted valve or bad lifter etc. Compression test might show that. FICM can read 48V yet still be bad. Have you checked for leaks in the high pressure oil system?

 

It's a brand new motor. So I'm thinking maybe the FICM.

It better not be a compression issue. I just spent $15,000 on installing the new motor.

 

I did the injector buzz test. It repeated itself 3 times. All three times I only heard 5 injectors.

I also have a couple glow plug codes P0673, and P0675

Does that narrow it down to the FICM more?

 

OUCH! That hurts!

 

make shur the injector harness is fulley plugged in with no bent pins at ficm and all injectors that dont buzz

check injector harness for chaff

you could back probe the injector harness with a dvm for continuty on injector 1

sound like a ficm since not all injectors buzz

 

15K on installing a new motor....

and now your doing injectors on it...?

If the motor was actually "new" like you sad... if it were my truck it would be sitting at the ford dealership that installed the new motor. and I would not accept it back until its fixed properly.

15K would have been a nice down payment on a 6.7

 

I'll check ficm and injector harness connection in the morning, good idea.

My guy that installed the motor checked all the wiring and said it was good. I had asked to have all the wiring harnesses replaced. he said that wasn't necessary.

 

I know man. I was looking at it this way. A new truck is about $1,200 a month. So if I could even just get 14 months out of the new motor, I would be in the same place I was. I thought the new motor made more sense. I think the truck has a gremlin in the electrical somewhere, and I am not very experienced in electrical so it may be hard to find. i can swap out parts no problem, but I don't want to be throwing more injectors at it. In fact my wife said, 8 injectors, no way! Sell the stupid truck and get a new one with warranty!

I just wish I could figure this out. If I could I'd be very happy!

 

theres also a ficm ground on the back intake manafold bolt check this one to

 

thanks, will do!

Should I pull out ficm and check the soldering? Or if AE shows 48V is it gonna be fine?

 

you could check the solder joints Iv only read a little about the soldering and it seamed like everyone was trying to get the power up to 48 volts since you have 48 volts IDK

like op said even if you have 48 volts ficm could be bad like a bad ficm injector driver

If it ran good for a few compression probably ok

 

ran fine for about 8hrs. And when I say fine, I mean a little rough (190 injectors), but it sounded like normal before the new motor.

At the end of the day it started to lope real bad. Whether cold or hot it lopes and shakes.

 

has it always run ruff since new moter

what do you get for icp and ipr at hot idel

 

no, it ran pretty darn smooth for about 2 weeks. In fact I couldn't believe how much quieter it was.

ICP is 0.9 volts at hot idle
can't remember IPR but I think it was ok. I'll re-check tomorrow