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, Etc.

 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 04-05-2012, 01:00 PM Thread Starter
Junior Member
 
jwiggs225's Avatar
 
Join Date: Mar 2010
Location: Billings, Montana
Posts: 71
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?

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
jwiggs225 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 04-05-2012, 03:07 PM
DF Sponsors
 
dmaxalliTech's Avatar
 
Join Date: Feb 2007
Location: Zeeland, MI
Posts: 289
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

Eric Merchant
2003 GMC 2500HD CC/SB - Arrival Blue - The Drive for 55
2011 GMC Denali LML - currently in a million pieces
2003 GMC 2500HD RC/LB - Loud - Shop Truck
www.merchant-automotive.com
Bullet Proof Motor Mounts | Transfer Case Pump Upgrade | Bosch Injectors | Head Gasket Kits
Allison Transmission Upgrades
Your Diesel Performance Destination
Find us on FACEBOOK
866-399-7169
dmaxalliTech is offline  
post #3 of 10 (permalink) Old 04-05-2012, 03:29 PM
Banned
 
Join Date: Nov 2008
Location: Arizona
Posts: 17,252
Send a message via AIM to Hondarider552
I would want to see the tech II in person.
Hondarider552 is offline  
post #4 of 10 (permalink) Old 04-06-2012, 08:50 PM Thread Starter
Junior Member
 
jwiggs225's Avatar
 
Join Date: Mar 2010
Location: Billings, Montana
Posts: 71
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.

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
jwiggs225 is offline  
post #5 of 10 (permalink) Old 04-06-2012, 08:53 PM
DuramaxForum Fanatic
 
lddrew's Avatar
 
Join Date: Jul 2010
Location: Athens, GA
Posts: 7,772
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

-Lee-
LBZ Crew - EFI - MBRP - Profab - Airdog
Raptor lined rockers and flares by me
my "build" thread
Raptor color match thread
ATP Trucks
lddrew is offline  
post #6 of 10 (permalink) Old 04-06-2012, 09:05 PM Thread Starter
Junior Member
 
jwiggs225's Avatar
 
Join Date: Mar 2010
Location: Billings, Montana
Posts: 71
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!

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
jwiggs225 is offline  
post #7 of 10 (permalink) Old 04-07-2012, 07:24 PM
Duramax Lifetime Supporter
 
Join Date: Feb 2012
Posts: 133
I went with the XX filtration system and FASS fuel pump. The XX filters are huge.
prier5 is offline  
post #8 of 10 (permalink) Old 04-07-2012, 07:48 PM
DuramaxForum Enthusiast
 
rebpdt's Avatar
 
Join Date: Nov 2010
Location: across the street
Posts: 3,774
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.

CCSB LB7 4x4
rebpdt is offline  
post #9 of 10 (permalink) Old 05-06-2014, 04:02 PM
Junior Member
 
Join Date: Mar 2014
Posts: 26
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

2008 2500 HD
Super Spring... Thats it all stock
bullhunter6x6 is offline  
post #10 of 10 (permalink) Old 05-07-2014, 06:22 AM
DuramaxForum Enthusiast
 
Join Date: Mar 2011
Location: Northern MN
Posts: 2,843
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.

2008 2500HD LTZ, EFI Live- Idaho Rob's Tunes, 4" Magnaflow Turbo Back, Raptor 150 Lift Pump, Transgo Jr, All Season Diesel EGR delete with high flow Y-bridge, Edge Insight for gauges,
ironman_gq is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome