06 Volvo VNL 780 d12 issues

Did you change the fuel filter?

 

Check egr valves they will throw injector codes

 

Do egr delete change prime pump it comes with whole housing same thing happened to me but no matter what you do to d12 they will always be on weak side i owned my for 7 years they might not be strong truck but they will go alot of miles without rebuild for sure i throw bun ch of parts every year around tax time but they might not be powerful but they workhorse ...also if u never changed epg governor and valve i would change that to

 

Egr deleted epg disabled so guess housing change not getting air in fuel during tests but who knows going down road it loses power at random sometimes for short period but lately runs low power more than normal just like a derate only have about 50 to 60 percent power normal this truck runs with the big dogs but lately makes me want to get under the porch it’s embarrassing

 

Did you ever figure out your power loss, and what would be the best way to delete your egr? I just started having issues with boost loss that would come and go, and I'm getting a check engine for my egr cooler being blocked up. I've had the egr cooler blockage for a while, a mechanic just put a blocker after the egr cooler to stop it from entering the intake. This could be causing back pressure to my turbo correct? Could damage my turbo in the long run? The turbo boost was randomly dropping down to 10 from around 30 while climbing hills and then going back to normal for a couple days. It was at a constant loss of power (10 psi) for the last 100 miles or so, so now I'm trying to fix all the problems for good as well as I can. I can't find any info on egr del... nowadays. I pulled off the intake to the turbo and it looks good and spins freely, no oil. I just had a PM and my water serperator looks good. Any info on what else it could be would be greatly appreciated. I hope it isn't an injector.

 

I have a 2006 volvo vnl 670 d12d btw, with an OEM turbo 20516147