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Discussion Starter #1
So I was helping a friend try to diagnose his problem and now I'm stumped. His truck is a 99 2500 4x4. It is a factory manual truck, fass 150, hot rod pump, 150hp injectors (don't know the brand), and edge juice set on stock. The truck had these mods done when he bought it. Had a slightly rough idle, ran it out of fuel then the next day on the way to work it started idling very rough, it accelerates strong,with only black smoke, but at constant fuel it is rough. No smoke at idle and It idles about 1000rpm, but varies between 950-1075. At first I though fuel pressure, so checked and its 17-18psi. So looked at injectors, took them to be pop tested and get new orings on them and tubes. Cummins shop said they weren't too bad, but rebuilt them and sold him new tubes saying one had messed up threads. Same part number on tubes, all new o rings and copper washers. Now truck still has the rough idle like its missing and far less power. No codes stored, but it blows the ECM fuse constantly which knocks out dome light also. The wiring work don't under the hood is sloppy, and just all around looks like previous owner was clueless about working on a vehicle. Do you guys think we have a electrical problem, or something else?


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Aren't the hrvp's known for a possible rough idle, or am I mistaken? If he's blowing ECM fuses, that should definitely be addressed, as he has a short before the ECM or internally (much less likely). Which fuse is blowing, and will it start when said fuse is blown?
 

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Discussion Starter #3
The truck was idling much better a couple weeks ago. Yeah it starts, runs and drives with the blown fuse.


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Also i wasn't there this afternoon to help him put it back together since I was working. He is a diesel mechanic at his work, but deals with cats and such that are all mechanical. Is it possible he made a mistake installing injectors, tubes and new intake gasket that would cause the huge loss of power, or do you think the shop made a mistake rebuilding the injectors?


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Aren't the hrvp's known for a possible rough idle, or am I mistaken? If he's blowing ECM fuses, that should definitely be addressed, as he has a short before the ECM or internally (much less likely). Which fuse is blowing, and will it start when said fuse is blown?
I just read your post again. It's the fuse under the plastic clip and its labeled ECM.


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I would say that pump is part of the problem. Those are not the best for the street. take the ecm to cummins and have it tested, if its fine then your ECM is crap. Hows your fuel pressure after the pump?
 

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