Well guys, I have 25,000 miles now on my truck. For about the last 4,000 I have noticed a serious drop in my fuel mileage. I used to get 17-18 average and if I set the computer on the highway, I could get 20-21. Then all of a sudden my average was 13-14 and highway was no better than about 15. I changed the fuel filter, changed the oil, and installed a K&N filter. All this with no results. I decided to take it in for a checkup just in case. The news! 2 bad injectors. WOW!!! I am completel disappointed. I came out of owning several Toyota trucks, with never a problem one with any of them.

I did a search and only found older model Duramax problems. Has anyone else had this problem? I know the injectors in the older models have problems as my dad has one, but I thought this issue was corrected.

Pete B

Lbz as a rule have minimal injector problems, I haven't replaced any on lbz's yet....

Well guys, I have 25,000 miles now on my truck. For about the last 4,000 I have noticed a serious drop in my fuel mileage. I used to get 17-18 average and if I set the computer on the highway, I could get 20-21. Then all of a sudden my average was 13-14 and highway was no better than about 15. I changed the fuel filter, changed the oil, and installed a K&N filter. All this with no results. I decided to take it in for a checkup just in case. The news! 2 bad injectors. WOW!!! I am completel disappointed. I came out of owning several Toyota trucks, with never a problem one with any of them.

I did a search and only found older model Duramax problems. Has anyone else had this problem? I know the injectors in the older models have problems as my dad has one, but I thought this issue was corrected.

Pete B

Sorry to hear about your troubles, It is very uncommon though so far to see LBZ's with injector trouble, IIRC, theres been a couple. Let us know how it turns out!

I think mine are going too then. I have the EXACT word for word problem you have going on the last few days. I even ran it empty and filled at another station to see if it was something with the fuel. It has 1500 miles on the new fuel filter and 13000 miles on the odometer.

I did the same thing, i ran it almost dry and changed stations for a couple of tanks with no change at all. I am using power service diesel kleen now, but tried that at the time too, with no response. I am pissed they failed, but glad somethign might bring my mielage back up. I drive about 3,000 - 4,000 a month and that is killer on the wallet.

I tried the power service one time also, no change for me either. I think it may be time to have my injectors checked. Do they need a check engine light on to be able to check my injectors I wonder?

time for an fs 2500:damnit1:

time for an fs 2500:damnit1:
Sorry; I need help... What is an FS2500??

Nevermind, I just googled it...LOL

A friend of mine who drives an 04 Powersmoke and owms his own shop was ribbing me about alot of problems with injectors in the LBZ's. He had heard this through some International dealer who was supposedly replacing 1000 a week in the chevy's. This is the first that i have heard of injector problems so hopefully he is full of ****. 29k on mine and no problems yet.

1000 a week huh? And why would an international dealer be working on a duramax? sounds like another b/s story. To the original post, sorry for your problem but keep in mind all of the diesels today are running a high pressure fuel system. It doesn't take much dirt to foul a system up. Good luck, and keep us posted.

I havent heard or read on here many lbz injector problems, Hope you find a good dealer who takes care of you, I think thats where gm really lacks from my personal experiences. The gm/duramax/allison is a great truck,however the dealer network sucks, from the dealers I have tried w/my problems, and from what I ahve found, the dealer didnt stock a fuel cap, fuel filter, fuel pressure regulator (been wating 4 weeks for that one and still waiting), service is what makes the next sale.

I agree about the service. I made an appointment for 7 AM. I was informed it would take a couple of hours to diagnos. So at 1 PM I called to check the status and was told they were just geting to it. I asked what good was the appointment for then. I was informed that the appointment was just a time to actually drop the truck off. What a bogus scam that is, i could have dropped it off anytime an it still would have been first come first serve.

Now, the injectors are supposed to be in Friday, I hope. I was given a rental, because I was told the engine components were apart and couldn't be driven. Nice gesture giving me the rental, but was told I was not covered for it over the weekend incase the injectors don't show up. Yippee!!!!! After getting the rentl, I needed some stuff out of the truck, so i went over to it and popped the hood as well. All was in place and nothing was taken apart. I guess they don't want it driven with bad injectors or there is a bigger problem. We will see, I will keep all posted.

Now, the injectors are supposed to be in Friday, I hope. I was given a rental, because I was told the engine components were apart and couldn't be driven.
After getting the rentl, I needed some stuff out of the truck, so i went over to it and popped the hood as well. All was in place and nothing was taken apart.


Sounds like a case of missing veracity. I wouldn't trust them to do the job -> go to a "honest" dealer with a good record of servicing diesels.

jb

Is GM stil changing all 8 injectors with the LBZ's like the LB7's?

time for an fs 2500:damnit1:

Are you talking about the oil filtration system or do they have a fuel filtration system as well?

For the amount of money you spent with them I would tell them where they can stick their weekend rental fee. I think they try that with everyone just to see if they bite; I would make it clear to them you are not paying for the rental period. And if they still want to charge you, I would charge them for the lost time with your truck!!:mad:

I recommend the Kennedy fuel filter system... As an added bonus it comes sandwiched between a pair of fuel lift pumps! :D

I agree about the service. I made an appointment for 7 AM. I was informed it would take a couple of hours to diagnos. So at 1 PM I called to check the status and was told they were just geting to it. I asked what good was the appointment for then. I was informed that the appointment was just a time to actually drop the truck off. What a bogus scam that is, i could have dropped it off anytime an it still would have been first come first serve.

Now, the injectors are supposed to be in Friday, I hope. I was given a rental, because I was told the engine components were apart and couldn't be driven. Nice gesture giving me the rental, but was told I was not covered for it over the weekend incase the injectors don't show up. Yippee!!!!! After getting the rentl, I needed some stuff out of the truck, so i went over to it and popped the hood as well. All was in place and nothing was taken apart. I guess they don't want it driven with bad injectors or there is a bigger problem. We will see, I will keep all posted.


That is BS. I used to work at a dealer. They should be paying for the rental over the weekend or allow you to have it back. They just want to be cheap. Call the GM cust service line if their tune doesn't cahnge.

Is GM stil changing all 8 injectors with the LBZ's like the LB7's?



Definitely no. I had problems on my lly. They could only do the bad ones. I had one they said was close to going bad, but still within tolerance so they could not replace that one. The replace the one & I was back 2 weeks later for the other one:mad: .

i have had no issues with my LBZ nor my LLY. LLY has 174k miles on it and LBZ has 15K miles on it. I use Stanadyne and if I run out, then I use the power service.

Speaking with my Diesel Injector service rep, he recommends running an additive every fill up when dealing with ULSD fuel. Of all 3 manufacturers, dodge, gm and ford, when going through the warrantee contract, on the 3rd page, they state they will not cover any intenral engine damage caused by the use of ULSD fuel. This contradicts the first page where they state there will be no issues with use of ULSD fuel. Just something to ponder about as he gave a lecture to several diesel service mechanics here in NC 6 months ago and pointed it out to them.

I agree about the service. I made an appointment for 7 AM. I was informed it would take a couple of hours to diagnos. So at 1 PM I called to check the status and was told they were just geting to it. I asked what good was the appointment for then. I was informed that the appointment was just a time to actually drop the truck off. What a bogus scam that is, i could have dropped it off anytime an it still would have been first come first serve.

Now, the injectors are supposed to be in Friday, I hope. I was given a rental, because I was told the engine components were apart and couldn't be driven. Nice gesture giving me the rental, but was told I was not covered for it over the weekend incase the injectors don't show up. Yippee!!!!! After getting the rentl, I needed some stuff out of the truck, so i went over to it and popped the hood as well. All was in place and nothing was taken apart. I guess they don't want it driven with bad injectors or there is a bigger problem. We will see, I will keep all posted.
What horse shoot. You want to hear about a story and crappy dealers, read my saga about my truck low rail pressure saga, in this section (lbz's). The more I read about these crappy gm dealers (yes I know even ford and dodge have them) , and experience crappy dealers, crappy parts networks, I hope I get my money back on my lbz and buy an older truck I can work on myself. I know tons of guys have good dealers, good trucks, but I dont have a good dealer nearby , and all stuff has problems, so you are stuck going to the dealer if you want warrenty claim and seems gm dealers stink,. Tell gm and their warrenty to stick it, ill buy an older truck work on it myself, and when I cant go to an independant shop that I know that is good, and treats me right. Rant over.

My dealer doesnt want to work on my truck this week because of the "holiday easter weekend" but yet they are open normal business (all day ) friday and saturday but since its easter weeknd dotn want to start it?????? My question to the dealer was if your not closing early then waht diff doest he wholiday make?? maybe why your dealer cant get it fixed and doesnt want to pay for the reantal.

Are you talking about the oil filtration system or do they have a fuel filtration system as well?

I screwed up!!!!:cookoo: I had 2 pages opened up one with this thread and another with a soot problem lol....what I ment was "time for a Nicktane kit" I'll clear that up haha :banghead:

I've heard that Duramax Injector problem can mostly be traced to dirty fuel? Is that correct?

If so, a secondary filter would be a good investment.

My van already has a secondary 10 micron filter in addition to a primary filter so I think I should be OK.

I have been running WVO for 1000 miles now and the injectors seems to be holding up.

I screwed up!!!!:cookoo: I had 2 pages opened up one with this thread and another with a soot problem lol....what I ment was "time for a Nicktane kit" I'll clear that up haha :banghead:

Thanks, bro :)

I've run stanadyne additive along with nicktane kit. Fuel is a weak point, IMHO. My experience, while anecdotal, has been excellent using stanadyne since 1994 (dodge cummins)...LLY and now a LBZ.

I have been waiting for a bit warmer weather to see if my mileage gets better but we have switched back to summer blend here I think and I havent seen any better mileage. I was seeing 17-18 last summer and now Im aroung 12-13:eek: all per the DIC, I havent hand calc it yet but my DIC was usually pretty close. Any codes show with the bad Injectors??? or did you just go by your loss in mileage??:(

I just went on my loss by mileage. There were no other symptoms to speak of.

I just went on my loss by mileage. There were no other symptoms to speak of.


Any updates yet on your truck??

Yes, I posted them in a new thread "BAD INJECTOR UPDATE!!!"

My check engine light came on, the truck is running fine though. I've read this thread and the mileage everyone says they're getting has me concerned. I've never gotten better than 14-15 mpg from day one, even on the highway with a light foot.....I'm wondering if this might be something with my injectors. My truck is an 06' w/ 30,000 miles on it so far. Just had a full service two weeks ago and changed the fuel filter also.

Guys,
My LBZ had the injectors go bad after 2000 miles!!! Dealer ended up replacing all 8 after having the truck for 2 weeks. First they said it only needed 3...then 2..then the remaining 3!! Now runs great but my mileage has never been good. From day one, about 12-13 mpg. With the new injectors 14-15 mpg with Stanadyne on every fill-up. I'm going to install my Nicktane this weekend, can't afford to lose another set of injectors:rolleyes:

Guys,
My LBZ had the injectors go bad after 2000 miles!!! Dealer ended up replacing all 8 after having the truck for 2 weeks. First they said it only needed 3...then 2..then the remaining 3!! Now runs great but my mileage has never been good. From day one, about 12-13 mpg. With the new injectors 14-15 mpg with Stanadyne on every fill-up. I'm going to install my Nicktane this weekend, can't afford to lose another set of injectors:rolleyes:

Dont tell me you footed the bill on having yours replaced...:( With just 2000 miles..

Well guys, I have 25,000 miles now on my truck. For about the last 4,000 I have noticed a serious drop in my fuel mileage...
Pete B

Just last week I dropped off an injector pump for service from a Perkins/Hobart welder I am working on. The service manager stated that his service company, a diesel injection service that works on pumps and injectors only, see's many brands of modern electronic diesel injectors going bad after 25,000 miles. He attributed the problem to two things mainly: dirty fuel and lack of lubricity in the new ultra low sulfur fuel. He recommended two easy fixes. Filters that clean at the 2 micron level and Stanadyne Blue. I have been using the OEM GM filter and I just started using Stanadyne Blue at every fill-up. I don't know what level the OEM filter cleans at. I have heard different reports.

Any GM techs out there? What micron level does the OEM filter clean at?

Dont tell me you footed the bill on having yours replaced...:( With just 2000 miles..

NO..dealer paid for everything..just lost my truck for two weeks. GM (tech line) was jerking the dealer around saying they would only pay for 2 injectors first...tested it, then needed 3 more...tested it, then they changed the remaining 3!! So everytime I had to wait another 1-2 days for the parts. Thanks GM:mad: ...always trying to save a couple $$$. And in the end it just cost them more overall!! Oh yeah, and then they questioned my fuel, so they drained the tank and filled it with "fresh" diesel. It's only been around 1800 miles since then...so I'm keeping my fingers crossed and going with the Nicktane to avoid any possible future fuel problems.

Sorry for rambling....Oh yeah and did I mention how much I love this forum? So much info:D Thanks again DP!

Let,s not forget injector problems did not show up right away on 01's it took some time for the trucks to get some miles on them. then Kaboom. I bought my 04 thinking GM had finally gotten a handle on the problem. I've had 4 sets!