Injector Issue? Need some input

[Specialized89]

Driving home from work tonight, noticed the truck was low on power. Got home and realized my S&B intake had fallen apart. This has happened once before with the same results so I tightened everything and started the truck back up.
Now has a very noticeable lope to it. Checked the insight and found these balance rates...
#1 = -1.7 park +0.5 drive
#2 = -8.5 park +11.6 drive
#3 = -2.3 park +0.2 drive
#4 = -3.5 park -3.3 drive
#5 = -1.7 park -2.9 drive
#6 = -3.0 park -4.0 drive
#7 = -1.3 park -4.0 drive
#8 = 0.0 park +1.4 drive

Fuel pressure gauge shows the Airdog is putting out its required pressure, and truck had thrown no codes. I DID put some 2 stroke oil in this tank to see if it would possibly improve economy and to add some lubricity. The problem started about 1/4 way through this tank.

Any input on this would be really appreciated

 

[PACougar]

Have you checked all of your wire harness connectors around the intake?

 

[Specialized89]

All harness connectors are intact and connected

 

[Specialized89]

Updating this.
Took the truck out the next day and beat on it a bit. All problems went away.
Then tonight I leave work, shut the truck off at the store, then start it back up. problem returns.
#3 and #7 read +12.0 and the rest read -4.0.
Had to get the truck home so I drove it slow. By the time I got it home the problem was gone again.

I was thinking of possible diesel fuel gelling since it has been -27 C lately, but fuel is draining from my water separator with no issue, no water in the diesel either.

Any input?
Suspecting an electrical problem, just unsure of where to look.

Thanks

 

[PACougar]

Possibly a problem with your ficm?

 

[Specialized89]

Any info as to how I would go about verifying or testing it?

 

[PACougar]

My first thought is to try and borrow one to try. Maybe start by reseating the connectors to it. I'd do the ecu's too.

 

[Specialized89]

Well, I don't know anyone with a truck that is similar to mine. I may have to just start off going through each and every related connector to see if I find anything.

 

[PACougar]

My buddy had a very similar problem and after a ton of trips to the dealer, they figured out it was a loose connection at the ecu's. Keep us up to date and good luck!

 

[ripmf666]

Possibly a problem with your ficm?

We do not have the ficm on the Lbz there built into the ECM no dealing with fuel crap.

 

[ripmf666]

Some of the issues your having kinda sound like mine.
http://www.duramaxdiesels.com/forum/showthread.php?t=50487

 

[PACougar]

We do not have the ficm on the Lbz there built into the ECM no dealing with fuel crap.

I couldn't remember, but I'd still check the ecu.

 

[ripmf666]

I couldn't remember, but I'd still check the ecu.

Yes if he has any codes as if you read my issue the ECM can lead to a lot of the troubles.

 

[NC-smokinlmm]

Possibly a problem with your ficm?

LBZ does not have an FICM. The ECM is 32 bit so it can handle the fuel injection process unlike the old 16 bit ECM in the lb7 and LLY...

I would think hat you have a short or wire rub thru issue somewhere in the injector harness...

 

[Specialized89]

No codes at all. It felt like it was running on 6 cylinders when driving it last night.
Will check ECU connections and the like and report back.

It just seems odd that it did it after my intake fell apart. Could find no damage wires or connectors anywhere in that region though.

 

[NC-smokinlmm]

Just for shits and giggles what does your fuel temp sensor read?