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  1. General Discussions
    Well... my previous coolant problem has not been solved. I did do a block test to confirm that there is not any combustion gases present (thank goodness) however after spending time trying to track down this leak something odd happened. I had my no-spill funnel connected with about a quart of...
  2. General Discussions
    This is the 2nd time this winter my truck has some coolant under it, both times from when I go to start it when it’s been pretty cold out. What’s weird to me is it only seems to leak when the truck is starting for the first time that day in the cold. Once it’s started it doesn’t leak for the...
  3. 2011-2016 (Non Powertrain)
    Hello all, I replaced the radiator on my 2012 lml with a Murrary Radiator from the parts store. All connections from the hoses seem to be original size besides the lower rad hose. it’s almost the outlet on the radiator for the lower rad hose is a different thickness but the same size. Meaning...
  4. 07.5-10 LMM Duramax Powertrain
    I have an 08 LMM Duramax. I seem to keep getting a code for “injector leak detected” first it was cyl 3 (p02a5) I reset it after running top end cleaner through and the code came back about a week later. Upon further inspection, the fuel return line had popped out so I plugged it back in...
  5. Transmission Shop
    Was under the truck today to find where my power stealing leak was coming from found out it was the hydro boost itself but while under noticed my Allison had a little fluid on it. Anyone know what this nut is?
  6. 911 Problems Forum
    So I have a 2012 LML and my EGR cooling feed pipe (part Number - 12641851) has a hole in it. ive been told so many different things about the replacement of this hose such as pulling the cab or dropping the transmission and i saw a video on 2016 which told me i didnt have to do any of those...
  7. 01-04.5 LB7 Duramax Powertrain
    Hi all, Im new to the forum although i have been reading for quite awhile. I have a 2001 Silverado with 167k on it. Bought truck knowing it would need injectors. Before injector swap the truck ran perfect just heavy hazing. no codes and plenty of power. All 8 injectors and hard lines have...
  8. Drivetrain
    FYI https://gm-techlink.com/?p=17057
  9. General Discussions
    Hello all! Recently decided to do away with the factory style up-pipes and decided to go with both the passenger and driver side pipes from PPE. while doing so I also pulled off the driver side manifold and updated that with the better flowing design (bd diesel). torqued down manifold bolts to...
  10. Transmission Shop
    I recently picked up a second farm truck(2007.5 2500HD). It appeared to have a decent transmission leak coming from around the front of the pan near the bell housing when I bought it. Last week I dropped the pan and replaced the filters and gasket. While doing so I noticed a scratch on the...
  11. 911 Problems Forum
    on my way home i smelt a lot of coolant the coolant add sign came on the dash and the truck started getting hot so i pulled over and find this coolant leak busted and no coolant in the truck does anyone know what line it is called or how to buy one and why it busted was the turbo getting hot? i...
  12. 07.5-10 LMM Duramax Powertrain
    I have a 2009 LMM Duramax deleted and tuned with a fass fuel system. It will go into limp mode from time to time but leaves no codes in it besides P02B9 this last time it did it. The shop that just did injectors in the truck said it was do to water in the fuel. They have cleaned it out since and...
  13. 04.5-05 LLY Duramax Powertrain
    Mechanic reports seals leaking, fluid low, wants $2,000 to r&r seals. Does this sound reasonable? Disabled USMC vet needs some advice.
  14. General Discussions
    So I recently bought a 2003 2500hd 6.6L duramax. I didn’t have problems in the beginning but then I noticed when decelerating there was a low wind down hum. (Don’t know if this is connected) Found out I was low on transmission fluid... REALLY low. It took a whole quart and still isn’t full...
  15. 04.5-05 LLY Performance Parts Discussion
    Hi everyone, I have a stock 05 LLY Sierra 2500HD. I was changing out the thermostats when I noticed an oily soot build up down from where the EGR intake manifold connects to the engine. Is there a gasket that should be replaced there and is it as simple as unbolting the manifold at that spot and...
  16. 911 Problems Forum
    I have a 2003 extended cab lb7. It has a custom 5in aluminum driveshaft. I discovered the output shaft seal was leaking. I decided to change the seal and the slip yoke. It’s leaking just as bad now with the new parts. No vibration, doesn’t seem to be any unnecessary play anywhere, slip yoke is...
  17. 01-04.5 LB7 Duramax Powertrain
    I’m new to the duramax world and have an 02 2500 Silverado just found out the transfer case is leaking when I went to drive today I know of the pump rub issue but don’t know much of the signs from it I have some pictures and to me it looks like the where the 2 cases meet the main gasket is...
  18. General Discussions
    I recently bought an 05 LLY with 250k, owned for about two weeks and I noticed puddles of dexron near the driver side front tire. The strangest part is that it’s not an everyday occurrence. Some days it leaks, some days it doesn’t. Sometimes it’s a decent sized puddle, sometimes it’s a few...
  19. 04.5-05 LLY Duramax Powertrain
    I know this question has been posted in varius forms and forums, but i have added to many variables into the equation to immediately jump to a head gasket leak. The truck is a 4.5 2500hd gmc, mods that might have influence on the issue are, sinister egr delete, and banks intercoolers. The truck...
  20. 04.5-05 LLY Duramax Powertrain
    I’ll start this off by saying I haven’t heard this truck run yet. LLY. Doesn’t prime. I believe there’s air drawing into the fuel system. Previous owner replaced fuel tank, sending unit, fuel lines up until where they turn up at the fire wall under the cab, filter housing and has a cat filter...
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