LBZ: LBZ white smoke rough idle

[j17sims]

Need a little help
I was Hauling cattle coming back empty pulling a hill and felt a shutter and pedal went dead looked in the Mirror and was pouring I Mean POURING white smoke it whited out the road, got pulled over and it engulfed the truck in smoke in which I could tell it was fuel. Towed it home and started it and had a light haze from pipe and rough idle. Data logged for balance rates and they were great most was + or - just shy of 2. Telling me injectors should be good. So thought I must have cracked a piston well ran a compression test on it tonight and highest compression on it was 425psi and lowest was 390psi so it confirmed to me that piston(s) were not cracked. But has what seems to be a fuel knock and still rough idle. I have a new FPR on the second CP3 which was changed due to it being bad and spiking rail to 30K psi, it didn't get ran but 30-45 seconds when it did this. so I'm kind of puzzled on this. Could I have split or dropped a tip and still have balance rates good? I dont see how but If so correct me. thanks for any help.

Dads a cummins guy and it really sucks when he has to tow you home!!!! Ill never hear the end of that :roflmao:

 

[j17sims]

Forgot to add NO code at all.

 

[Hot COCOAL]

Did you check the overflow tank for pressure? Maybe a head gasket blew?

 

[j17sims]

Coolant level is spot on and upper radiator hose was not hard felt normal as before this.

 

[SickLL7Crenshaw]

Balance rates should deff tell you if you lost a tip. Dumping fuel in a cyl would indicate a pretty deep - rate. IG your balance rates are good and compression, next I would look at the desired and actual fuel rail pressure. Is your EGR blocked or deleted?

 

[Brent@LDS]

When is the last time your fuel filter was changed?

 

[durallymax]

Have you tested to see if it can hold max rail pressure at idle?

Had an LBZ do the exact same thing you are describing, fuel smoke then dead. Balance rates were misleading because of how poor all of the injectors were due to contaminated fuel. The return rates were also very misleading, the injectors were returning so much fuel that only a couple showed high return rates simply due to the fact the others didn't get any fuel to begin with. I figured this out after replacing the two "suspects" and finding the identical issue all over again in the next two, thats when they all came out and were tested, all failed and were replaced. In a contamination situation sometimes that's your best bet, unless you don't depend on your truck.

Pull your filter and see what you drain out of it. The LBZ in my case was full of nastiness and I ended up having to clean the tank out as well.

If you suspect an injector or two or all, take one to an injection shop for testing. Around here its less than $50 and the fee is waived if you buy the replacement there.

 

[j17sims]

Egr is deleted and I have not checked rail pressures yet but disired is 5900 if I remember right on the tune I was in when this happened I dropped it down to my "stock" tunes which I believe was 5200.

I have not commanded max rail not even sure how I can if it can be done with a v2 I'm unaware. And please chime in.

Fuel filters on air dog were not changed but maybe 500 miles ago I still run engine mount filter also for extra filtration, and it hasn't been changed in awhile. Not questioning you by with that much filtration do you think it would be able to get contaminated fuel to the pump?

 

[durallymax]

Contamination can still happen although not as likely with that many filtration steps.

Time on the truck doesn't matter, for this truck it was less than 100 miles and it was junk. The issue was a used fuel barrel he decided to use to store his diesel.

You can go into DVT to command fuel pressure. You can also run a cylinder cutout test to see if the shaking/smoking gets better with a certain cylinder shutoff.

 

[motorzane]

Check the fuel for gasoline

 

[jevanb]

I lost a injector (stuck open) filled all 4 lanes with white smoke then died never to be restarted until it was replaced

 

[j17sims]

ok update smoke is no more but developed a knock to it determined knock from drivers side. Pulled connector on number 2 cyl. and started no knock just a miss. pulled #2 and 4 inspected and all good on tips, sent out and had injectors tested just picked up and cyl 2 was over fueling and 4 under fueling per spec but was withing 5cc of spec so they think its no issue. So I've decided I'll buy one injector and see what happens and of coarse my luck they dont have one to start things off second they are on national back order. they can rebuild them but dont know if they can get all the parts yet, and they are a Bosch dealer I guess I have to order from somewhere else, I wont be making this weekends pull.

 

[Brent@LDS]

We have LBZ injectors in stock. Let us know if we can help.

 

[jevanb]

to start things off second they are on national back order. .

it took me 3 months to get a rebuilt inj back in 2011, I would think everyone would have them now. not 1 single dealer across the U.S would give one up if they had one...

 

[j17sims]

I got a single from not so local dealer and hour away with a discount since the computers went down when he was looking bin location up and I had to wait an hour for them to find location, but hey saved me money in the long run. Anyways installed injector started up no knock but very clattery. So I think could the new regulator I just put in be bad too?
Pinched off line on second cp3 and instantly perfect in pinch and clatter starts back. Ok so swapped regulator and perfect ran truck smoked white when on throttle heavy for a few times but cleaned up. And seems to be running fine. Not sure if it was just a weird case of injector being open and regulator shit shit and hung it open. But I really don't think injector has an issue so I will have a spare now. Would love to have been able to try her out today but pull that was rescheduled once for today was again rained out. Will see how next weekends pull goes. Thanks to everyone for your input on helping with this.