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  1. Duramax Sixth Generation: 2017-2019 (L5P)
    so i have a 2019 silverado 2500 hd l5p and for a few months now it has been making a weird noise through the exhaust when i am at wide open throttle when the truck shifts from 2-3rd gear. does not do this any other time through any other gears and not even in park wide open. i took it to dealer...
  2. Introductions & New Trucks
    Hi All, 2000 Chevy C3500HD 6.5L Turbo. This is my first diesel truck but have some years working on Cat 3408 and 3508 Engines. the 6.5 has been a challenge and learning experience for sure but I am fast closing in on making it all as bulletproof as possible. Bought this truck from a utility...
  3. All Other GM Diesels
    Hey guys I'm new here I had a code p2598 pop up narrowed it down to the wastegate solenoid now I have the part but I don't know how to do the relearning of the turbo I was told I would need to do this.. if anyone can help or has any tips it would be greatly appreciated. Cheers.
  4. Duramax Second Generation: 2004.5-2005 (LLY)
    Recently just had a few codes pop up. P0101, p0299, p02563. Truck won’t build much boost and the idle will go up and down. I think it’s the turbo vain position sensor but not 100% sure. Anyone else have this problem?
  5. 6.5L Diesel Engine
    Thank you everyone for helping me out with ideas on this problem. I tried to be very thorough with the history of the vehicle and the mods below and anytime I fixed or serviced something. Describe the problem you are having in detail: The truck is struggling at 55/60 MPH. I took the truck into...
  6. Any Other Vehicles
    Hello, we are in need of some hivemind assistance. This will be a long post but I figure if I get all the details out at first maybe something will ring a bell to someone. We have a 2014 Ram ProMaster with the turbo diesel engine. We purchased it two years ago used and built it out into an RV...
  7. 6.5L Diesel Engine
    First of all, thanks to the forum for all the guides for this engine. Which have helped me solve different DTCs and problems. I apologize if there is any inconsistency or misstatement, my native language is not English, I am from Chile and I bought a GMC K1500 with the 6.5L engine, it´s my first...
  8. 6.5L Diesel Engine
    1998, 6.5 turbo diesel, won't start Daily driven truck, stalled driving highway speed once, and no previous symptoms. Now it won't start, tried the obvious and replaced PMD (it has relocation kit, under bumper), i checked grounds and have two brand new batteries (cranks over fast) lift pump is...
  9. 6.5L Diesel Engine
    So I have a 99 K2500 Suburban, 230,xxx miles. When I purchased it, it had a grease car system on it. It would idle sporadically, lose fuel going down the highway, and die occasionally. It would way up the boost to make up for no fuel. It had already had a PMD relocated to the front bumper on a...
  10. 6.2L Diesel Engine
    Just had an old step van with a 6.2 pre-purchase inspection done and the mechanic who did it said I can't turbo a 3 speed. They said the top speed in this old step van postal truck would be 55 max. So knowing I've seen threads here about turboing it I asked and then she said you can't because...
  11. 6.5L Diesel Engine
    Hello guys. I have a 93 2500 2wd regular cab long bed. 6.5 turbo diesel,DB2, Water injection, 2.5 inch crossover, 4 inch exhaust, nv4500, g80 3.73, 30 inch tires. I want to use my 12000 gvw trailer. Towing between 6 and 10 thousand pounds comfortably 65- 70 mph on the interstate. Also towing my...
  12. 6.5L Diesel Engine
    1. Describe the problem you are having in detail: Starts and runs well with one issue. After warming up, turbo is inconsistent. Lagging power and black smoke. Installed boost gauge, which confirmed the turbo works sometimes getting 3-9 PSI, then not working at all at times, which directly...
  13. Duramax Second Generation: 2004.5-2005 (LLY)
    All I have installed on my truck is a turbo mouthpiece and it has turbo whistle coming off idle. I notice it in the mornings but could be doing it all the time. It has 139k on the truck and it's a new truck for me so I'm not sure how its suppose to actm. How do yalls trucks sound?
  14. 6.5L Diesel Engine
    I replaced the compressor wheel on my truck's GM-5 with a wicked wheel 2 while the turbo was off, doing a lot of other engine and exhaust work. There is an odd rattle coming from the exhaust and turbo at idle now. I moved the waste gate shaft around and pushed and pried on it with the actuator...
  15. 6.5L Diesel Engine
    Apparently my turbo is giving me -1psi of boost... The saga: Installed a Glowshift boost gauge, and on first start noticed that it didn't appear to work, the needle would actually drop instead of go up. I did some testing and figured out that the vacuum pump wasn't vacuuming. I had already...
  16. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    I have the turbo out on my 06 LBZ and wondered what else I should do while I have the access. The only mod the truck currently has is a blocker plate on the right up pipe to the EGR. If I completely remove the EGR system will I need to get the truck retuned? I am thinking it would be a good...
  17. 6.2L Diesel Engine
    Hello everyone I’ve got a 1986 m1028 cucv and I would like to put a 6.5 turbo on it not for added power so much as I just wanna hear some turbo whistle while adding a tiny bit more power. I know I can’t run more than 4 to 5 psi but is there anything I should look out for??? thanks guys.
  18. 6.5L Diesel Engine
    Alright, so I bought the truck back in April 2020. It's a '99 K2500 but the previous owner put a '97 VIN S as he said the original engine crapped out. He said the '97 had around 170K miles on it when it was put in, but didn't say how many miles he's put on it after it was put in. The odometer...
  19. Duramax Second Generation: 2004.5-2005 (LLY)
    So I learned the hard way on the road that my LLY runs hot when towing in the heat. I already have a k&n intake that I’m not wild about (plan was to upgrade it to a different filter). Can I run an improved turbo mouthpiece with the K&N intake or would I need to swap that out to make it work?
  20. 6.5L Diesel Engine
    How interchangeable are the different GM-4,5,6,8,etc... turbo parts? I have three: a 95, an 97, and another with no "GM_" number. I polished up the compressor housing on the one missing the tag wanting to put it on the 1997, but it has a slightly different shape. CHRA's look basically the same...
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