2005 Duramax wont go over 2000 RPM

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#11

07-18-2014, 11:01 AM

2004LB7

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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

10-21-2014, 11:19 PM

Michael Wyatt Rose

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Quote:

Originally Posted by robertcookII

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

07-10-2016, 11:49 PM

Duramax01

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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

#14

10-30-2016, 09:57 PM

Dun4sho

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Quote:

Originally Posted by robertcookII

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