Duramax towing “engine reduce power”

Willyracer · 06-29-2021, 07:24 PM

It is a 2008
I found a shop that changes the valve from a 2 stage
Valve to a single stage.
The 2 stage opens at a high pressure and stays open till
The pressure drops below a low pressure setting

The single stage opens and closes at same set point

That my understanding of how the valves work.I could be
mistaken on operation of the valves

Bob Gullett · 06-29-2021, 11:56 PM

On my LBZ 2007 Silverado was getting a low fuel pressure code. And would only happen when towing the trailer. Took it to a friend who has lots of experience with these engines and run a diesel repair shop. Replaced the injectors and problem cured. Not sure if this is the same issue you’re having but thought I’d share my experience.

voltdr · 06-30-2021, 09:38 AM

Mine is also an LBZ. I bought a tuner that would check balance rates too. But it only checks them up to 1500 RPM. I also installed an AirDog system. The only thing that fixed it was replacing the injectors. I was told that it has to do with how much fuel was being returned .
Dan

Willyracer · 06-30-2021, 03:32 PM

Thanks, can the injectors be sent and tested or is it a waste
Of time and just replace the injectors?

Looks like injectors are 350 to 450$ each for reman.

06-29-2021, 07:24 PM	#1
Willyracer Junior Member Join Date: Feb 2019 Posts: 88 Likes: 8 Liked 57 Times in 24 Posts	Re: Duramax towing “engine reduce power” It is a 2008 I found a shop that changes the valve from a 2 stage Valve to a single stage. The 2 stage opens at a high pressure and stays open till The pressure drops below a low pressure setting The single stage opens and closes at same set point That my understanding of how the valves work.I could be mistaken on operation of the valves

06-29-2021, 11:56 PM	#2
Bob Gullett VIP Member Join Date: Mar 2002 Posts: 1,106 Likes: 57 Liked 507 Times in 116 Posts	Re: Duramax towing “engine reduce power” On my LBZ 2007 Silverado was getting a low fuel pressure code. And would only happen when towing the trailer. Took it to a friend who has lots of experience with these engines and run a diesel repair shop. Replaced the injectors and problem cured. Not sure if this is the same issue you’re having but thought I’d share my experience. __________________ 68 Chevy11 327 F/S

06-30-2021, 09:38 AM	#3
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 706 Likes: 77 Liked 100 Times in 51 Posts	Re: Duramax towing “engine reduce power” Mine is also an LBZ. I bought a tuner that would check balance rates too. But it only checks them up to 1500 RPM. I also installed an AirDog system. The only thing that fixed it was replacing the injectors. I was told that it has to do with how much fuel was being returned . Dan __________________ Dan Foley SC 4698

06-30-2021, 03:32 PM	#4
Willyracer Junior Member Join Date: Feb 2019 Posts: 88 Likes: 8 Liked 57 Times in 24 Posts	Re: Duramax towing “engine reduce power” Thanks, can the injectors be sent and tested or is it a waste Of time and just replace the injectors? Looks like injectors are 350 to 450$ each for reman.