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2005 Duramax wont go over 2000 RPM

Chevy/GMC Duramax 06-07 LBZ Discussion of Chevy and GMC Trucks with LBZ Duramax Turbo Diesel Engines

2005 Duramax wont go over 2000 RPM

  #11  
Old 07-18-2014, 10:01 AM
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What Knagel said,

after reading this over again, it seems that the first thing to check is the pressure relief valve. Google "Duramax bottle test". should get you all sorts of info on how to check if it is leaking.

or... just shim it anyways
 
  #12  
Old 10-21-2014, 10:19 PM
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Originally Posted by robertcookII View Post
For more than 2 years periodically out of the blue the engine will not rev over 2000RPM! if you stop and turn the truck off and wait 2 minutes and restart it will go back to running fine, sometimes for a minute sometimes for a month. i took it to a dealer and they said it was the computer, egr, and egr cooler. I replaced them all and it made no difference. i have put over 50k miles on the truck fighting this , any Ideas? The truck has 215k and runs like new when this is not happening.
The problem is the high pressure fuel pump, the exact thing happened to my Dmax its a bitch to get too but it will sove the problem it's about 2000$ to fix
 
  #13  
Old 07-10-2016, 10:49 PM
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Default Duramax Boggs at 2000rpm

I've had this same problem on mine and I changed the fuel filter and air filter no fix, but then I went to the fuel filter and the red wire that connects on there was loose so I played with and pushed it back on there nice and good haven't had the problem since hope this helps
 
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Old 10-30-2016, 08:57 PM
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Originally Posted by robertcookII View Post
I have changed the fuel filter multiple times. I will take off from a stop and upon acceleration it will stumble and then boom it just won't go over 2000rpm. This does not generate any codes either!! So anyone have any ideas??
fuel pressure regulator valve sticking, get a quart of Royal Purple Transmission oil and put in and do that every 8 fill ups. Low Sulphur in Diesel causes this and Fuel Rail Etc... needs to be Lubed
 
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Old 01-28-2019, 06:33 PM
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Default 2005 duramax wonít go over 2000 rpm

Originally Posted by robertcookII View Post
I have changed the fuel filter multiple times. I will take off from a stop and upon acceleration it will stumble and then boom it just won't go over 2000rpm. This does not generate any codes either!! So anyone have any ideas??
does your truck have a chip in it? I just had it happen to me.
 
  #16  
Old 02-25-2019, 06:45 PM
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Same thing just happened to me. I changed both batteries a couple of weeks ago and sometime either shortly or immediately after my truck wonít go past 2000 rpm. The fuel pressure gauge on the tower is normally very active and now it just sits on 8 or 10. No power hardly whatsoever... I changed the fuel filter last night and if it helped at all itís barely noticeable.

I should also note that I let the fuel tank get close to empty around the time this started as well. The truck has a chip in it and itís got 200 k miles on it. Looking at taking it into the shop but just curious if anyone can point me in the right direction here with a diagnosis?

Thanks
 
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