Hey guys. New to the forum but not to Cummins. This is my fourth Cummins!
I just picked up a 2006 5.9 with an auto that has 140k on the clock. It has a BD exhaust manifold, Banks intercooler and Banks a intake elbow and AFE cold air. Egt, trans, and boost gauges also. Everything else is stock as far as I know. But no tunes. I think the PO pulled whatever tunes they had on them off before they sold to a dealer.

So! The truck runs pretty good. I'm used to my tuned 6.7 and this is my first common rail. BUT I started it one morning about 40-50 degrees and noticed it was loping kind of hard, almost missing. And there was a lot of white smoke billowing for a good 30 seconds until I revved up and until the motor got warm. I have a video also if anyone is curious.

What I did was replace the fuel filter, cleaned out the fuel filter can (very dirty in the bottom) and so far ran 2 tanks (56 gallon tank) of diesel Kleen additive through it. It doesn't lope nearly as bad and only smokes for about 10 seconds now. The other night when the truck was warm I noticed a slight haze at idle in the cars headlights behind me at a stop light.

I also put a friends snap-on solus on the truck and did a injector kill test, it was obvious when each injector was killed. And I also did a contribution test. All cyclinders were reading 100-105% besides the number one cyclinder. That was at 90-98%.

So now I don't know if I have a bad injector or what to do! Sorry for the long post but any help is much appreciated! Thank you!

 

So as far as i can think, my truck has also been loping hard in the morning sounding like its missing basically...But i never had any smoke until recently, i hae been told this is a sticky injector issue and should be taken care of soon and here i am replacing all 6 of my injectors at 250k for an 03 cummins 5.9...the white smoke kinda points toward injectors for sure but if you have a video id definitely like to see it. I was also told it can be an fca issue, but im replacing that too at the same time...i know my truck needs injectors based on the miles anyways but the symptoms its been givin me really shows how worn my injectors are...the smoke is what really says its not the fca or anything else...i have surging aswell when its cold so im hoping a new fca can fix that. Oh and also, kill the injectors when its cold or use a infrared temp reader when you first start it up and point it at each exhaust port on the manifold, they should all be within a few degrees..a cold sticky injector wont show issues usually when it warms up!

 

Injector #1 is bad. They should not be any more then + or - 4% of 100 (i believe it's 4%) that injector that is at 105, it also should be replace

 

X2- as you probably know don't buy the reman junk- buy new injectors (2-6)and upgrade filtration soon if possible!

 

Injector #1 is probably the only good one. Just because it is low doesn't mean it is the bad one.

That reading is way too wide, something wrong with that test to read 90-98%.

More than likely the ones reading high are the bad ones. You need to run an injector kill test and watch the rpm drop as you kill each cylinder to understand what the contribution percentage means.

Note the contribution test MUST be run when the engine is at full operating and preferably with 5 minutes after driving it hard. Any longer than that and the test is voided as the cylinder cools.