LBZ bad injectors??

[anthonyon44s]

06 lbz 200k
i check fuel rates every few days on an edge insite and sometimes ill get an injector +4 in park ill drive truck a mile and check and it'll be -.9 or somthing and a diff injector will be high and then mostly there all be within -/+ 2.. whats weird is if u rev truck in park it doesnt return to idle quick it will hover around 1k rpm for a few sec them slowly idle down to normal.

the real kicker. sometimes if im beatin on the truck it will shake a lil bit and feel like its missing at idle and kinda stumble if takin off slowly. calculated fuel rate will be low at idle than normal and balance rates will read 0 u let truck sit overnight and it will be fine until u beat on it again..

didnt notice fuel in oil, truck will sometimes puff a lil smoke at startup if its sits mostly black sometimes like a grey color
fuel economy towing is shit now.
iv tried cleaners no luck really
have i gotten some bad fuel?

i just changed filter i poured what was in filter in jar it was mainly water as expected but also had a small amount of orange jel junk in it.

i was told i have bad injectors but nothin was tested except balance rates so idk if he was just tryin to sell me them or if there really bad

 

[Hot COCOAL]

Which filter did you pour H2O from? Water in the fuel is no good...didn't your dash light indicate to you that there was H2O in the fuel?

Sounds like one or two might be sticking, with that kinda mileage I would almost expect something like that, and considering the mileage, it wouldn't surprise me if they were shot, especially after a water treatment. GM makes an upper cylinder cleaner/lubricant that has had really good results breathing new life into injectors, i would try that first before removing them, if it were me. You don't have to worry about fuel in the oil on an LBZ like you would on an LB7 or early LLY cuz the injectors sit in the side of the block like spark plugs(sorta) where as the older gen duramax injectors were under the valve covers and could leak into the oil

 

[jnieberlein]

06 lbz 200k
i just changed filter i poured what was in filter in jar it was mainly water as expected but also had a small amount of orange jel junk in it.

If any of your filters contain mainly water the odds are there is water is in your fuel and in your engine, Water and Duramax injectors do no mix at all. You may be lucky and have caught it in time but from the sounds you describe with your rates changing number and which injector it is, is a tell tail sign of water, best advice I can give you is get rid of all your fuel, drain your tank and change your fuel filter again ( Several more times) and get a good biocyde additive, I had similar symptoms, except my injectors were actually out of spec, it started with one injector and then moved around and then it was two injectors and it moved around until all the injectors ended up out of commission. left it set for a week while I was trying to figure it out and lo and behold I had water in the fuel ( alot of it) It took out all my injectors and my fuel pressure regulator. Not a cheap fix at all

Good Luck

 

[anthonyon44s]

i change the filter often its normally not this bad, water in filter light has never came on but i change it abt every 2k

if i had a bad injector the rate would be out of spec all the time right?

mine if ones at -4 in park and i rev the motor once it returns to idle it could go to +1 the rates are all over all the time on both my programmer and a snap-on scan tool.

the rates mainly stay between +/- 2 when i baby truck but as soon as u get on it a few times it starts acting up and will continue until it sits over night..

got 12 pullin a small trailer (2k lbs).. last summer i could get 15 pullin double that.

 

[Dozerboy]

You don't have to worry about fuel in the oil on an LBZ like you would on an LB7 or early LLY cuz the injectors sit in the side of the block like spark plugs(sorta) where as the older gen duramax injectors were under the valve covers and could leak into the oil

Your still going to wash down the cylinder walls and get fuel in the oil. They are going to have to be worse then that to do it though.


You really change the fuel filter every 2K? Thats way to much and isn't doing you any favors.

Are you checking the rates right? There is a spec for idle and in drive and 3 at idle doesn't really sound bad, but I don't know for sure.

I think you have something else wrong.

 

[Porno Joe]

i change the filter often its normally not this bad, water in filter light has never came on but i change it abt every 2k

if i had a bad injector the rate would be out of spec all the time right?

mine if ones at -4 in park and i rev the motor once it returns to idle it could go to +1 the rates are all over all the time on both my programmer and a snap-on scan tool.

the rates mainly stay between +/- 2 when i baby truck but as soon as u get on it a few times it starts acting up and will continue until it sits over night..

got 12 pullin a small trailer (2k lbs).. last summer i could get 15 pullin double that.

No you can have a bad injector and have a balance rate in spec. Balance rates are a test that CAN help you find a bad one, but are not the definitive answer to which may or may not be bad. The only true way to know which are bad would be to pull and send out for testing.

Also those rates are not that bad. I think ppl say +-4 in park and +-6 in drive. Not 100% sure on that one though.

I'm not saying you don't possibly have 1 or 2 bad ones, to me it sounds like something else

 

[THEFERMANATOR]

Post up what the balance rates are for each cylinder at idle HOT(170 or warmer), fuel pressure, and what the fuel rate is at idle when you check them in park A/C off, A/C on, and then in gear. Without knowing the fuel rate balance rates are worthless. Also balance rates will vary ALOT from cold to hot, and is no cause for concern. What is a cause for concern is a balance rate that climbs when at a hot idle(say goes from a -2 to a -4). They should be fairly consistent at a hot idle if the nozzles have a good spray pattern.