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  1. Duramax Fourth Generation: 2007.5-2010 (LMM)
    I have a 2009 LMM (400 000km) that was running just fine but had a couple bad glow plugs. I swapped the glow plugs then went to start it and it would crank but not start. I have done a couple things to try and diagnose the issue but cant seem to figure it out and cant find an answer online. No...
  2. 6.5L Diesel Engine
    Ill try and keep it short as most will be covered in checklist but basically have a 3500hd that would surge at highway speeds when throttle was released all the way and smoked excessively under load or heavy acceleration. Other than that had no problems aside from an oil leak from oil pan and...
  3. Duramax Fifth Generation: 2011-2016 (LML)
    2013 model 210,000 miles I have been adding coolant for almost a year, just topping it off every few weeks. The past month ive had to top off every other day, truck ran fine and showed no signs of issues other than coolant getting low. Did multiple test with the coolant and the die and...
  4. 6.5L Diesel Engine
    I am currently having issues with my 1994 C2500 2wd 5 speed. I just bought this truck and before purchase the guy before me had just had a diesel shop install a new injection pump and glow plugs. I drove this truck 250 miles until I had issues with it. It started fine I drove it and shut it off...
  5. Duramax Fourth Generation: 2007.5-2010 (LMM)
    30 degree night. Warmed up truck for 10 minutes. Drove to town and filled tank but after leaving I got 1.5 miles down the road and trucks dies and I coasted to a stop. Read code and p0087. Towed home and replaced fuel filter first. Several times I have Primed and started but immediately dies...
  6. 6.5L Diesel Engine
    1993 K2500 with the DB2-4911 pump I was gifted a new (rebuilt) 4911 pump for my 93 from O'reillys. It has a lifetime warranty (which is super nice, because I have already had to replace one pump from them due to a fuel leak from the transfer pump locking screw.) After installing this pump, I...
  7. Duramax First Generation: 2001-2004 (LB7)
    Hello, I was driving my truck the other day and I went to hit the gas but didn’t get a response, I then noticed the battery light came on and the truck died. I pulled off to the side of the road and tried turning it back on but truck wouldn’t start. It would crank fine but not start. There was...
  8. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    371,000. I live in FL so cold weather is normally not an issue. Last year replaced all the glow plugs, glow plug sensors, both front and rear thermostats as it was getting to the point that it would not crank. Check engine light had come on at least 10 years ago indicating glow plug sensor out...
  9. 6.5L Diesel Engine
    2weeks owning this 1994 dually suburban slammed it new 17 inch wheels and tires all the way around bought it replaced the starter on 2nd day and here I am 300 miles later again click click start what is up do they eat starters ?? Or
  10. First Generation Duramax Electronics/Tuners
    First, sorry if there is any wrong spelling or grammar. I have been using a PPE xcelerator and love it. 2003 lb7, I changed the tune the way I always have over the last year with this programmer and now my truck will not start or crank over. I replaced the batteries, checked all fuses/relays...
  11. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    Ok so my lbz 7.5 had the injectors go out at the time I didn’t have the money so the truck sat for almost a year I got new injectors and replaced them and now will not start I bought a hand pump new sending unit almost every sensor even replace the one on the injection pump I did spray some...
  12. 6.5L Diesel Engine
    Hi guys, new to this forum. I’ve been her a million times before today to find the easiest fixes for my truck, but this one has stumped me for more than 2 weeks now. I’ll start with some history since i’ve owned the truck. I bought it 2 years ago, within the first 4 months the PMD **** the bed...
  13. Duramax Fifth Generation: 2011-2016 (LML)
    Change fuel filter came on truck defrayed to 40mph then shut down I replaced fuel filter primed it reset fuel filter life and still no start any recommendations would be appreciated
  14. Duramax Fourth Generation: 2007.5-2010 (LMM)
    For over 6 months we have been trying to fix this issue. We have replaced all modules and both resistors. We got truck running for two weeks all sudden no start no crank again. Now I'm getting no comm with ECM and transfer case module. Ecm is getting voltage so is tcase . From what I've been...
  15. Duramax Second Generation: 2004.5-2005 (LLY)
    Looking for ideas. Not clear what works what. A little over a month ago truck began No crank, no start. After a few tries would start. And would be fine. For a while. no pattern. Got progressively worse. Issues noticed. PRNDL light not working. Noticed, after numerous start attempts, Fuel gauge...
  16. Frankenstein
    Hi guys I have a humvee with a lml Duramax conversion I am using a DMax swap harness and have a known good upper engine harness, I am having troubles with it I can crank but ignition signal one is always off, I pinned into the back of the pcm and I am getting voltage going into ignition signal...
  17. Duramax Fifth Generation: 2011-2016 (LML)
    2013 Duramax, It drove home last night just fine. I went to start it today and all it does is crank. The truck has almost a half a tank of fuel. Diesels are new to me. It may not be getting fuel. what is the easiest way to check. Or what else could I check without any specialty tools. Thanks in...
  18. Duramax Second Generation: 2004.5-2005 (LLY)
    2004. Started fine, drove down the road no issue for about 15 klms, engine just cut out. Armstronged off the road only light on was battery light. Would crank and not start. Have an edge, ran codes and got the alternator f field and L field lost contact. All other readings fine including...
  19. Duramax First Generation: 2001-2004 (LB7)
    I just got the passenger side stuck in a swamp and it looks like it sucked muddy water up cause the k&n filter was full of muddy water and it wont start. Any ideas or suggestions?
  20. 6.5L Diesel Engine
    Hello everyone I am new here, I have a problem with a 1993 Chevy 6.5 turbo diesel. It does not have the p.m. d-box but it does have something bolted on the mechanical pump that plugs into top of the pump. It gets warm and it will not start I have to wait till it cools down enough for the glow...
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