LMM Injector Problems - Chevy and GMC Duramax Diesel Forum
07.5-2010 LMM Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 04-05-2012, 01:00 PM   eBay Motors  #1 (permalink)
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LMM Injector Problems

Hey guys, I have a 07.5 LMM with no engine modifications whatsoever. My 5yr/100k warranty ends next month due to years not miles. It has 77k miles on it. I took it to the GMC dealer here in Billings, MT yesterday just to have them check things out before the powertrain warranty is up.

I got a call from the service guy this morning saying that 4 of my injectors are bad. He said balance rates/return rates were out of spec. The fix will be covered under warranty but of course they will only fix the 4 they think are bad. I was surprised since everyone says the lmm's don't have injector problems. I haven't seen any white smoke or noticed a change in oil level.

I bought the truck new and I use Diesel Kleen every other tank and replace the fuel filter about every other oil change (10k to 15k miles). I really wish I knew what caused the injectors to go bad so that I could prevent it next time.

My worry is that they will fix the 4 injectors and after my warranty is up next month, the other 4 will go to $hit.

My question is should I pay to have them fix the other 4 while the truck is torn apart and most of the labor is already done?

What do you guys think?
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Old 04-05-2012, 03:07 PM   eBay Motors  #2 (permalink)
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So you had no known issues going in? Yet four are bad? The only types of failure I have seen on those are high return, more common with 150k+ miles and seems more common in high ambient temps

I would not worry about the other four for a while
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Old 04-05-2012, 03:29 PM   eBay Motors  #3 (permalink)
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I would want to see the tech II in person.
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Old 04-06-2012, 08:50 PM   eBay Motors  #4 (permalink)
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Thanks for the responses. I went and talked to the tech who was working on my truck and he showed me the balance rates. One of the bad ones was over 6, two were a little over 4, and the other was 3.7. I can't remember if they were + or -. I still don't know what caused them to go bad and neither do they. The service tech told me that he has only seen a couple lmm's have bad injectors with similar mileage. Truck is supposed to be ready early next week. Hopefully the other 4 last for a long time.
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2007.5 GMC Sierra 2500 CC/SB SLT LMM
--Engine is Bone Stock
--Rims/Tires(305 50R20 Toyo), line-x bed/rockers
--Upcoming changes: cognito leveling kit, remove dpf, add led taillights

2007 Jayco JayFlight 27bh
2007 Polaris Sportsman 500efi
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Old 04-06-2012, 08:53 PM   eBay Motors  #5 (permalink)
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weird. have you noticed the truck shaking at idle/injector tick/fuel related noises???

i would recommend getting some better fuel filtration. i think that and low cetane are two huge problems with US diesel
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Old 04-06-2012, 09:05 PM   eBay Motors  #6 (permalink)
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I did notice a couple weeks ago that the truck seemed to be shaking while sitting at stop lights. I didn't think much of it though.

What options are there for better filtration? I'm not much of a mechanic. The only reason I know anything about my truck is because of this forum!
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2007.5 GMC Sierra 2500 CC/SB SLT LMM
--Engine is Bone Stock
--Rims/Tires(305 50R20 Toyo), line-x bed/rockers
--Upcoming changes: cognito leveling kit, remove dpf, add led taillights

2007 Jayco JayFlight 27bh
2007 Polaris Sportsman 500efi
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Old 04-07-2012, 07:24 PM   eBay Motors  #7 (permalink)
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I went with the XX filtration system and FASS fuel pump. The XX filters are huge.
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Old 04-07-2012, 07:48 PM   eBay Motors  #8 (permalink)
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Billet Aluminum OEM Filter Adapter, Nicktane Diesel

This will let you run a CAT filter. Filters are MUCH cheaper than stock and about as good as it gets in filtration for our trucks.
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Old 05-06-2014, 04:02 PM   eBay Motors  #9 (permalink)
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I have a 08 lmm with 88k. injector 2 and 7 are bad. And dealer cost to replace.... just the 2 is 2400! and that was a month ago... I am still waiting for my truck! The last I herd from the dealership is that they are waiting for gaskets! I understand needing the parts to do the job but a month? Crazy
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Old 05-07-2014, 06:22 AM   eBay Motors  #10 (permalink)
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You can change an injector yourself in your driveway in about 20 minutes on the LMM's. Shouldn't need gaskets, its a fuel line, an electrical plug, and 1 bolt that keeps them in. A reman injector runs about $450 from most places. I'd tell your dealer to pound sand and show you the parts they replaced.
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