I'm in North Central Louisiana, small town called Jena, I will have to drive an hour to get a qualified diesel mech to do it.Quote:
Originally Posted by Duramaster
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I'm in North Central Louisiana, small town called Jena, I will have to drive an hour to get a qualified diesel mech to do it.Quote:
Originally Posted by Duramaster
Well, I picked my truck up this afternoon after having all the injectors replaced. I pulled out of the dealership and noticed the ticking seemed to be worse. It sounds like a valve but I believe it is fuel related because it only does it under acceleration. I called the service writer on my cell phone to let him know I still had a problem and see if I could catch him before he left. I stopped at a traffic light and noticed I also still had the idle surge. The service writer seemed irritated that the tech had not fixed the truck. I know they are graded on the customer surveys. I told him according to the research I'd done (mostly here) that the idle surge may be a problem with the fuel pressure regulator. I'm at a loss for what may be causing the ticking sounding with the injectors since they've been replaced. Maybe it's a computer issue with the fuel metering. Any thoughts? The writer said the tech should have reflashed the computer with this type of work but I have my doubts since it was not on the repair invoice. I left the truck and their diesel tech is supposed to look at it tomorrow.
The 04039a special policy does not cover reflash of the PCM. After replacing the injectors, if there is still a drivability concern I will then check the software as a courtesy. It only takes a few minutes to reflash the older DMAX trucks (less than 3 tenths of an hour). AS far as the tick goes, try this for size and see if this is what you ar hearing............... ;)
Subject: Information on Engine Ticking Noise #02-06-01-022F - (11/30/2006)
Models: 2001-2007 Chevrolet Silverado
2003-2007 Chevrolet Kodiak C4500/C5500 Series
2006-2007 Chevrolet Express
2001-2007 GMC Sierra
2003-2007 GMC TopKick C4500/C5500 Series
2006-2007 GMC Savana
with 6.6L Duramax
I think this bulletin refers to the infamous tick at idle on the Duramaxes. Mine had this at first and it has now all but disapeared and I rarely hear it anymore. The tick I'm referring to now only occurs when the engine is under load such as accelerating or pulling a load. It's not a random noise but is consistent and it goes away when you take your foot off the accelerator which leads me to believe it is fuel related.
Is it possibly an exhaust leak? :confused:
It sounds more like an injector to me. Almost like when the two-stage injection cuts out at high load/rpm conditions. I talked to the service writer today. He said the tech that worked on it today reflashed the computer. He said it took several attempts before the computer would accept it. Afterwards the tech test drove the truck and did not notice any noises or idle surge. He also said the fuel pressure regulator checked out fine. He is keeping the truck until Monday because he wanted the original tech that changed the injectors to check it out before they return it to me. Maybe I'm just to sensitive to changes on my truck. Hopefully they got everything taken care of. I'll let you know on Monday.
[QUOTE=Duramaster]This is the "MEAT AND POTATOES" of the special policy. Pay attention to the second paragraph. ;)
Subject: Special Policy Adjustment - Injectors - Replace #04039A - (10/10/2006)
Models: 2001-2003 Chevrolet Silverado
2001-2003 GMC Sierra
2003 Chevrolet Kodiak
2003 GMC TopKick
Equipped with 6.6L Duramax Diesel (RPO LB7 - VIN Code 1) Engine
Duramaster:
I have the heads off my 2001 to replace the head gaskets. The GMC dealer said they wouldn't warranty the injectors until I got the gaskets fixed. Well, now that I have the heads off, I can see that driver's side is a bit of a pain. If I were a tech at the dealer, I'd sure rather flag the hours and only have to install the injectors in a couple of heads on the bench. What do you think is the chance they will install the injectors in my heads? They agreed that it needed them, but of course wanted to do the head gaskets under CP, then would probably have billed the full pop to GM for the injector replacement as well (just guessing, I did work at a dealer for a while and that one used every trick in the book to extract bucks from the factory).
The other question I have is, knowing that these injectors have to be replaced, should I pull the injectors and replace the sleeves and seals now, or let them do it if they won't replace the injectors now with the heads off?
My injectors are not too bad yet, but they are putting fuel in the oil. How does that happen? Does it overfuel and go past the rings or does it leak straight into the oil?
[QUOTE=Philsauto They agreed that it needed them, but of course wanted to do the head gaskets under CP, then would probably have billed the full pop to GM for the injector replacement as well (just guessing, I did work at a dealer for a while and that one used every trick in the book to extract bucks from the factory).
The other question I have is, knowing that these injectors have to be replaced, should I pull the injectors and replace the sleeves and seals now, or let them do it if they won't replace the injectors now with the heads off?
My injectors are not too bad yet, but they are putting fuel in the oil. How does that happen? Does it overfuel and go past the rings or does it leak straight into the oil?[/QUOTE]
I might try a couple of other dealers. One may need/want the work and make a labor deal with you... Although it sounds like you are doing the gaskets yourself. And yes, I'd be suspicious of the dealer double-dipping. Although the tech will like it, unless the dealer messes with him/her. I'm sure duramaster would like to get paid for doing head gaskets and injectors on the same truck, but get the hours like they were done separate.
IMHO, if fuel is getting into the oil the injectors are "really bad" and should be replaced as soon as possible.
There are only three (maybe four) ways for fuel to get into the crancase on the DMAX that I am aware of: Leaky return rail banjo screw seals/ cracked pipe, cracked injector bodies, fuel pump shaft seal leak, poorous head where the fuel passes from inside the engine to outside the engine. Of course the head would have to be extremely poorous. As far as the double dipping goes............ Let me start by saying that I work at a shop that pays the techs by the hour. We are also members of the IAM District Lodge #24 Local Lodge #1005. :) Anyway, when we encountered a customer with the similar situation............. I don't know how the foreman handled the warranty claim. I know that the customer actually took the injectors and replaced the injectors themselves. We did the sleeves the first time (long story). As far as the sleeves go, Yes, reseal the sleeves since you have the heads off. Yes pull all the sleeves before installing the heads to make sure that the heads are not pitted where the sleeve taper seals against the head. And if the heads are good, I wouldn't put the sleeves and injectors in untill after you have the heads torqued into place. No risk of smashing the injector tips that way. ;)
So the cracked injector body is leaking fuel directly into the valve area, if I understand correctly. The reason I say mine is not too bad is that the oil has only gone up by about 1 quart in 3000 miles. But then maybe it has just started to fail.Quote:
Originally Posted by Duramaster
I'll contact the dealer that did the inspection and just ask them. It seems like a huge waste to have to pull this apart again. The passenger side is not bad, but the driver's side is kind of tight, with the steering column in the way and the bolts for the upper and lower rocker covers somewhat inaccessible on the rear. I had to rubber band in the rear lower head bolt and pull the head out with it still installed, and couldn't get the third back glow plug out either, without moving something since it bangs into the steering column. The other problem I had is the bolts that hold the exhaust outlet pipe onto the turbo were tightened to about 500 ft lbs torque and I almost killed myself getting them loose. I ended up leaving the two inlet pipes attached and the turbo sitting there. It wasn't a problem for disassembly but I don't know how easily it will go back together.
Don't those sleeves have to be driven into the heads with a driver? Why would I want to fight that with the heads already installed? I see your point on not damaging the injectors.
They still have my truck and cannot determine what's causing the idle surge. They said the fuel pressure regulator checked out but I'm still suspicious. It's not throwing any codes and they are on the phone with GM to determine what to check next.Quote:
Originally Posted by truckin
As posted in this thread earlier (or was it another?), tHE TOOL IS :::::::::::::::::::::::::
J 45910
Fuel Injector Sleeve Remover/Installer
And yes you do need to drive the sleeve back into the head. It doesn't take alot to reseat the sleeve. Check you mail Philsauto.
Duramaster,
I have a friend with a 2001 LB7 with a bit over 100,000 and he doesn't have injector issues yet, but he is looking for them. Would you be kind enough to run his VIN# to see for sure what his in service date and warranty issues were? He is the second owner of the truck. I would appreciate it very much.
VIN# 1GTHK23191F183751
Thank you sir.
Ed
I finally got my truck back today. They made me pay a $100 deductible for the injectors even though I asked them to double check since I didn't think I was supposed to. I got lucky and found my warranty extension from Chevrolet which stated in bold print "Injectors will be changed at no charge". I showed this to the tech who then looked on the computer and found the same verbage. Needless to say, they refunded my $100. I wasn't so lucky with the idle surge issue. They finally diagnosed it as........ you guessed it, the fuel pressure regulator. I suggested that may be the problem when I dropped the truck off. I guess they didn't like a shade tree mechanic diagnosing the problem even though I got the answer here. I wound up paying $910 ($510 for the part and $400 for the labor. I felt like it should have been covered but I couldn't argue since the warranty I had specifically said "Injector Replacement". I know I could have done it myself for half the price but I guess I have to look at it as I got a $4000 job done for $900. Anyway the truck runs great now with no idle surge.
The price seems a little high for the regulator (a lot actually). I will double check that one for you tomorrow. :o
Quote:
Originally Posted by Duramaster
I thought it was high also but I know GM has a fairly high markup on some of their parts.
Customer cost for the regulator at my dealership is $345.58!! :eek: :eek: That is for an LB7 regulator.
I'm glad I read here about the injector warrenty. We have had a 2001 GMC Duramax about a year and a half, we picked it up with 47,500 miles on it. We've towed a 9800lb Aistream with it for about 10,000 miles. While in Perry GA, we filled up in the morning at FlashFoods Diesel off exit 149/I-75 and drove about two hours. that evening when returning from dinner I noiticed a "ticking" at part throttle that was not there before. The next morning we were attempting to get on I-75 when the "Service Engine Soon" light came on and we had greatly reduced power, and of course the engine did not sound right. I have a prited copy of the injector warrenty from this site.........question is: is it bad fuel or bad injectors?
Now it is sitting accross the street at a GMC dealer in Perry, GA. We're lucky we were not towing and also that we planned to be at this large Airstream Rally thru the 5th of July......
The salesman I spoke with had never heard of the special warrenty.
Friends have said in there travels they have gotton bad diesel in their trucks and motorhomes.......this is the first time this has ever happend to me, and I've put 50,000 miles on my VW Beetle TDi at home in CT. Is it common?
Thanks
Dan
if in fact it is bad fuel, we have the reciept for the fillup of 17 gallons in a 25gal tank, are fuel stations responsible for the damage their bad fuel causes?
Dan
What usually happens is the customer pays for the fuel system flush and then submits the bill to the fuel station. You might want to contact the fuel station and see if they had anymore trouble with bad fuel that day.