Diesel Bombers - Cummins runs rough at 1800 rpm

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- - Cummins runs rough at 1800 rpm (https://www.dieselbombers.com/5-9-liter-cr-dodge-cummins-03-07/87518-cummins-runs-rough-1800-rpm.html)

bobracing32

12-08-2011 05:03 PM

Cummins runs rough at 1800 rpm

Ive got an 04 cummins and it starts and runs fine. Wide open in neutral runs good. Anything over 16-1800 rpms it runs horrible. Missing and no power. I changed the filter again and power service still runs like junk. Any ideas?? lift pump?

MurphyStrut

12-09-2011 07:05 AM

Do you have a rail pressure gauge?

NadirPoint

12-09-2011 07:57 AM

Good Question

Quote:

Originally Posted by MurphyStrut (Post 829301)

Do you have a rail pressure gauge?

Or even a low-side pressure gauge? How about codes set? CEL on?

Gonna need more info... :humm:

bobracing32

12-09-2011 08:16 AM

no guage. the trucks in the shop. They had called me last night saying they thought it was jelled. He said fp looked very good. However 16-1800 rpm it misses like its running out of fuel. Took the truck back to the shop last night. I was just wondering what could be wrong with it??

NadirPoint

12-09-2011 08:32 AM

Fuel pressure gauge(s) just might be the most important instruments you can run on these trucks.

bobracing32

12-09-2011 08:36 AM

I havent installed guages yet. There ordered but not here. The shop said theres very good pressure though. So what else could it be?

NadirPoint

12-09-2011 10:06 AM

If it was gelled like they said, then all is well now. :w2:

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