So I call the dealer today to ask about a diagnostic ($90) and a ballpark figure on the injectors. I got the light diesel haze at idle. Said they could change them all for around $3500. OK, I think better than the guys I hear paying $5k to get it done. Then the service guy says they have a cleaning procedure for $250 they can do, takes about 2 hours, says it restore them to new assuming none are cracked. Said since my problem is a light haze at idle, so far no indication of fuel in the oil, it would be worth a try.

Anyone got an opinion on this. I was thinking about a gallon of 2 cycle oil in the tank and see what happens first.

Haven't heard of any special miracle injector cleaning in the last 5 years that will help. I wouldn't do it.

Are you sure you are out of warranty?

If not find a dealer that will replace the injectors now. Some will work with you if they are accustom to the injector issues. You should post a thread for a "friendly" dealer in your area. If you were in mine I know of two that would not hesitate to replace all the injectors if you were hazing at idle.

Yes it does exist & it is worth the $. This cleans injector and rails & if you ask I am sure they will be glad to show you what was cleaned form the system. I had this done twice on the old LB7 in my 01. Dealer was $200 at the time & independent shop charged $100.

what was it?? fuggin sea foam???

wow Id like to see this one.

Prolly a bottle of Stanadyne and then they let the truck idle for 2 hours. If this was the fix then why are the injector problems to even begin with.

I use a can of BG 44K annually along with AmSoil diesel additive in every tank. Truck runs good and I suppose that the injectors are as clean as can be? I also change fuel filter every other oil change.:o:

while i'm sure a system flush isn't neccessarily a bad thing if everything is disconnected and the flow reversed, I doubt you're getting your money worth.

In 4 years on this site I have never heard of anything the help injectors from having issues. I am sure if something really worked there would be hundred's of threads from all the big dawgs years ago. There have not been and in most cases things of this nature have been proven to be nothing other the snake oil. At this point there is still no clear reason for the lb7 injector issues or a new injector that can prove to fix the issues. The best answer so far is in regards to the voltage used on the injectors. You money could be spent better by purchasing an after market fuel filter system like FASS.

Yes it does exist & it is worth the $. This cleans injector and rails & if you ask I am sure they will be glad to show you what was cleaned form the system. I had this done twice on the old LB7 in my 01. Dealer was $200 at the time & independent shop charged $100.

Well, based on no fuel in my oil so far, I dumped a gallon of 2 cycle wally world oil in the tank with about 3/4 of a tank showing, set her in tow/haul and road around for a bit pushing some fuel/oil through the injectors. Hopefully its just something a little sticky and it'll loosen up. The haze at idle is a bit embarrassing and from what I've read, has been detrimental to some when an injector hangs wide open. Figure I'll get some spray and clean the MAF this weekend. Too bad GM doesn't feel embarrassed that its Duramax motor smokes at idle and worked to improve the injectors on what is an awesome motor! I gotta say the power is great moving up from a 6.5 diesel.

I would get a two 16 oz bottles of stanadyne and use them along with the 2 cycle oil. The cleaners and additives take away lubricity, which is why they can clean out gunk. May work, may not. Heck, you're already hazing.

Definitely would run 2-3 tanks of pure #2 afterwards to see how it turns out. Then if still hazing, would push for new injectors if in warranty. If not, start reading all the threads on how to DIY!
jb

Yes it does exist & it is worth the $. This cleans injector and rails & if you ask I am sure they will be glad to show you what was cleaned form the system. I had this done twice on the old LB7 in my 01. Dealer was $200 at the time & independent shop charged $100.

Really? What's the GM SI document number?

Really? What's the GM SI document number?


The dealer doesnt have the document number, but he tells me it does exist, so it must be true. :cool:

The dealer doesnt have the document number, but he tells me it does exist, so it must be true. :cool:


And if you leave your bad injectors under the pillow the injector fairy will make them all better!

NOT!

jb

Just so you folks can sleep at night & not be looken under pillows for the injector fairy Wynns makes a system. :D I have no idea what systems the chev house or the Reid Graham used but I will find out if you like.

Just so you folks can sleep at night & not be looken under pillows for the injector fairy Wynns makes a system. :D I have no idea what systems the chev house or the Reid Graham used but I will find out if you like.

My buddy is a sales person for Wynns and i'll have to ask him about it. He did give me a bottle of injector cleaner but I dumped it in the old 6.5 because i don't have nothing wrong with the dmax and i run stanadyne in every tank. If you wish to ,for everyone else , find out what the system consists of and we can compare info.

Just talked to my buddy that works for Wynns and he said they do have a systen that they hook up to the injection pump and they start the truck and it runs off of the chemical they use and it cleans fuel rail and injectors. I will have to check this out one day and post a new thread and let you all know haow it worked.

Just talked to my buddy that works for Wynns and he said they do have a systen that they hook up to the injection pump and they start the truck and it runs off of the chemical they use and it cleans fuel rail and injectors. I will have to check this out one day and post a new thread and let you all know haow it worked.


Ask him if he knows what high pressure common rail means, and what a CP3 is.

I could be wrong but is sounds like all the junk knocked loose by these "cleaners" is then forced through the injectors. Is that really such a good idea?

snake oil......

I went to the Wynn's website and all that thing appears to do is inject a super-duper cleaning solution into the fuel supply while the engine runs. The only real claim made is that the machine is hooked up in such a way that no air enters the system during the hookup & removal.

IMO you could do the same thing by pouring the whoopdee-doo stuff in a new filter and letting the engine run.

IMO you could do the same thing by pouring the whoopdee-doo stuff in a new filter and letting the engine run.

Kinda what I was thinking. I will say a gallon of 2cycle and a full bottle of dieselclean(gray bottle) and she isn't hazing at the moment.(All day) Moment being the key word here. I feel sure I'm only buying a little time on an expensive long term problem.:)

Keep it civil guys, its just the internet!

They've been offering fuel injection cleaning at the repair shop for gassers for a long time. I'd guess just the same principal except with a diesel upcharge.:rolleyes:

Now if they could reverse the flow using pressure, hook into the lines and back flush the system so any junk would get pushed out rather than through the injectors would seem a worthy try.

If you take it in for a cleaning even though she was running fine as say maintenance and the dealer pushes a piece of trash into injector causing it to crack, who da furk is gonna eat that $3500 injector swap? That is my BIG question to a dealership. When I get back from Charlotte(NHRA boys, to bad it isn't 1/4 mile any more:mad:) I'll be asking that.

Well i could get it done for free but my truck runs good so I am not going to do it because of the point being made ,if something goes through an injector and screws it up I don't need that. I am going to wacth him do it on my buddy's powerjoke first and see what happens then maybe but prbably not.

Ask him if he knows what high pressure common rail means, and what a CP3 is.

And what if he does? I will ask him if anything is wrong with the vehicle(s) that he has performed this on. Maybe he has some feedback on how well it works.

Just an observation: I have pane injection on my 01 LBZ/LB7. After using the propane for a while then going back to straight diesel I have noticed the engine perfoms better. Then running for a week or two with out propane you don't notice the difference in performance as the change is quite gradual until you run propane again for a bit. Could it be that the difference in combustion pattern & pressure cleans the piston tops & the injector tips? And that cleaning process makes for a smother fuel delivery burn when just running diesel? Just a thought. Have any of you folks that are using propane noticed this? Or amI just feeling things, I know I'm aging but :D

Update is that Wynns has these machines at certain dealers and other certified mechanics shops and my buddy said that they only charge $157 to do it , and they also offer a warrenty with this cleaning it is a 200,000 mile warrenty on the injection system after the cleaning , but here's the catch, you are only offered the warrenty if your truck has 75,000 miles or less on the odometer. I read the warrenty myself. I can probably get the warrenty card that I read and post a pic of it if anyone would like me to.

eric and others have pointed out metal and other particulate matter in injection lines. think heavy cleaning would break loose and block port to injector, taking out injector. think fuel system cleaner and extra lube would be better. mike_miller think propane helps clean burn residual fuel, cleans injector nozzle ports, nozzles get accumilation around ports that screw up burn, and ports can get blocked. propane seems to work like water injection to keep cylinder clean.

And what if he does?.

Then he will know that this procedure is BS and doesnt work on our trucks, and in no way applies to a HPCR fuel system.

ben