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Old 08-04-2008, 08:37 PM   #1 (permalink)
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Duramax Injectors? Are they bad?

Yes I searched

I've got an '04 Duramax with 133k on it. It smokes a fair amount at idle, usually a little puff of black when it's cool and then it becomes a cloud at stop lights when it's hot. Does this sound like injectors? Is there a way to check them? I have acess to a moids, does that have an injector test function?

How much does it suck to replace injectors? I was told it was a 16 hour job and not fun. Where is the cheapest place to get new injectors?
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Old 08-04-2008, 11:34 PM   #2 (permalink)
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I thought they had a 200k warranty on injectors, but I don't know much about it.
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Old 08-05-2008, 01:20 AM   #3 (permalink)
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injectors are warrantied to 200k iirc...
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Old 08-05-2008, 02:30 AM   #4 (permalink)
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Changed the fuel filter recently?

LB7 engines (8th character of the VIN is a #1) from '01 to '04 are covered for 7-years/200k miles. LLY's ('04.5 - '06) and newer aren't covered.

If it is found that your injectors are bad and not covered for whatever reason, you're looking at $800-$900 per injector (the part only). The downside of the LB7 is that its injectors are under the valve covers (a lot more labor).
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Old 08-05-2008, 03:56 AM   #5 (permalink)
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you're looking at $800-$900 per injector (the part only).
That does not sound right to me, but what do I know.
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Old 08-05-2008, 07:20 AM   #6 (permalink)
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x2 on the filter change. I can look up your truck through gm to check if you still have warranty if you want. not trying to id teft your vin, Im a cheby dealer tech and have access to all that stuff. I just need the last eight.

just read my own post, I sound like a sketchy salesmen over the phone

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Old 08-05-2008, 10:09 AM   #7 (permalink)
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That does not sound right to me, but what do I know.
X2

I had mine replaced under warrantee recently. I'll dig out the reciept to see what cost was listed. I want to say they were listed around $200 each.
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Old 08-05-2008, 03:47 PM   #8 (permalink)
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injectors are warrantied to 200k iirc...
Only on 01-03, 04s had less of a warranty, I think
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Old 08-05-2008, 04:00 PM   #9 (permalink)
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yep they bring the suck, lb7's are covered for 7 years and 200,000 miles.
Also another prob with lb7's is the glow plugs in the federal emission vehicles, and they were picked up at the beginning of the year under warrantee for like 10 years 200,000 or 300,000 miles. I would also check the fuel filter first, and also check the engine oil to see if there is diesel in it.
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Old 08-05-2008, 06:21 PM   #10 (permalink)
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Fuel filter is fresh, power service additive in the fuel. I'm pretty sure it's not covered, had it looked up in May at a chevy dealer, i'll dig up the vin and PM it to you.

The injectors were $550ish a piece at advanced before running my account any other sources?
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Old 08-05-2008, 07:25 PM   #11 (permalink)
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Fuel filter is fresh, power service additive in the fuel. I'm pretty sure it's not covered, had it looked up in May at a chevy dealer, i'll dig up the vin and PM it to you.

The injectors were $550ish a piece at advanced before running my account any other sources?


If it's an 04 and 133k miles, it IS covered. Whatever dealer told you it wasn't doesn't know his ass from a hole in the ground. It's not actually warranty coverage though, it's a special policy coverage and not every dealer knows about it if they don't service diesels much (which also means you don't want to go there). Just this year the 04's were included in the coverage, so ALL LB7 motors are covered now. The 04.5 LLY's had a design change and are not a problem. They won't just replace them because the truck is smoking though, the policy states they have to have high fuel return rates, which is caused by internal cracks or excessive wear. This will cause smoking too, but the specific test is the return rate test for them to replace them. The test is pretty intrusive into the motor and by the time they finish the test, all that's left to replace the injectors is remove one bolt on each one and pop them out. The b!tch part is that if the truck passes the test (injectors are ok), you have to pay for it and it's quite a bit of labor (pretty much the same as replacing the injectors). A good dealer tech will know to do a balance rate test on the Tech 2 and see which injectors are pulling fuel back to compensate for the leakage before tearing into the motor. That's a simple 20 minute test on the computer and will tell them a lot. I know some techs that will see high balance rates and just make up numbers for the return rate test so they don't actually have to do it, then just replace the injectors. All the info from the return rate test has to be sent to GM for coverage approval.

My recommendation is to find a dealer in the area that knows what your talking about first, then talk to their diesel tech and make sure he's familiar with the job. A lot of dealers in my area send the jobs out to a single larger dealer who is used to doing tons of diesel work so that'd be the kind of place you want to find in your area.

$550 per injector is absurd, GM's dealer retail price is $322 each and that includes $30 worth of O-rings and gaskets.

If, for some strange reason, you end up having to do this job yourself check out www.dieselplace.com for info. There are several guys on there who can sell you the injectors and all the associated gaskets/parts you'll need to do the job for a good price and there's tons of info on the forum about doing the work yourself. It's not that bad of a job if your competent with tools and have lots of patience. I did the head gaskets on my 01 last fall and it wasn't that bad, just LOTS of parts to take off and keep track of and lots of time. I figure it was a solid 50 hours of work for me taking my time after work and weekends. Injectors would be around 16-20 hours for the skilled DIY'er on their first time.

Good luck, and feel free to ask if there's anything else you need to know!
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Old 08-05-2008, 08:19 PM   #12 (permalink)
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Checked my receipt, my recollection was off a little bit. Joe was within a couple of bucks. List is $314.39 and Net is $250.88, pn 97729095.
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Old 08-05-2008, 08:32 PM   #13 (permalink)
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If its an LB7 then its most likely injectors, I thought that only 01-03's were covered unless they extended the policy.
If its an LLY, then it could be your injector wiring harness, they had problems with those as well.
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Old 08-05-2008, 10:21 PM   #14 (permalink)
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OK, since this seems like a logical thread to ask in. I'm in the market for a D-max, and am looking at 03's and 04's. Because I like the body style (05's are different enough) plus the LB7 motor has the best fuel economy figures.

How does one tell if the truck your looking at has the LB7 or the LLY. From an earlier post, apparently the 8'th VIN digit is a 1 for the LBY.... what is the LLY??


thanks. I've just started to research.


Is there (obvious to the uninitiated) visual clues?
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Old 08-06-2008, 09:29 AM   #15 (permalink)
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yep they bring the suck, lb7's are covered for 7 years and 200,000 miles.
Also another prob with lb7's is the glow plugs in the federal emission vehicles, and they were picked up at the beginning of the year under warrantee for like 10 years 200,000 or 300,000 miles. I would also check the fuel filter first, and also check the engine oil to see if there is diesel in it.

^^^^ thats what you need to know. ^^^^
if your oil level is high then its a safe bet to say injectors are leaking.
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Old 08-07-2008, 04:58 AM   #16 (permalink)
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For any and all ?? on D-Max's go to www.dieselplace.com.
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Old 08-07-2008, 07:01 PM   #17 (permalink)
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. Injectors would be around 16-20 hours for the skilled DIY'er on their first time.

Good luck, and feel free to ask if there's anything else you need to know!
thats ALOT of time. i can do them in a pickup truck in under 7 hours. a 4500 series or a van reaches near 10-12
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Old 08-07-2008, 08:46 PM   #18 (permalink)
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Click on over to www.dieselplace.com Click on your year of pickup and you will find out everything you need to know there about D-max. Good luck
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Old 08-09-2008, 06:06 PM   #19 (permalink)
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I figured out how to test the ballances, when it was some what cold ballances were between 0 and .6. It's warming up right now.
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Old 08-11-2008, 10:53 AM   #20 (permalink)
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thats ALOT of time. i can do them in a pickup truck in under 7 hours. a 4500 series or a van reaches near 10-12

I can too, I was just being generous for someone who'd never worked on one of these before. I'd hate to cause someone to tear the top of a dmax apart and have them not be able to get it back together by the end of the weekend.
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Old 08-28-2008, 10:37 PM   #21 (permalink)
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The stealership is telling me that mine are toast again... second set of injectors in my 04' D-max in the last 2.5 years... 175K on the truck and it started smoking "White puffs" at idle about a month ago. I'm looking for aftermarket options, the mechanic said the injectors are a known problem with the Duramax engines.
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Old 04-21-2009, 10:49 AM   #22 (permalink)
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assistance please

Anyone heard of the 10yr/200k implementation?

if any GM "gm's" know of any update to the "Special Policy Number 04039" that would be relevant to the '01 lb7 owners, would be of great help and very appreciated ... ..in a timely fashion, the trucks in the shop!!! ..


haha thanks a mill guys

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Old 04-21-2009, 12:22 PM   #23 (permalink)
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Just had my injectors done and they were not covered. Its still the 7 year warranty on them so nope. Thank goodness I got the aftermarket warranty when I bought the truck two months ago.
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Old 04-21-2009, 02:04 PM   #24 (permalink)
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OK, since this seems like a logical thread to ask in. I'm in the market for a D-max, and am looking at 03's and 04's. Because I like the body style (05's are different enough) plus the LB7 motor has the best fuel economy figures.

How does one tell if the truck your looking at has the LB7 or the LLY. From an earlier post, apparently the 8'th VIN digit is a 1 for the LBY.... what is the LLY??


thanks. I've just started to research.

Is there (obvious to the uninitiated) visual clues?

Easiest way is to look at the RPO codes in the glovebox. It'll have LB7, LLY, etc. to tell you which one it is. All 03's are LB7's, whereas in the 04's you have to look. All the 04's I've looked at have been LB7's suprisingly but I guess I've been looking at early 04's.
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