Hi all,



I would really appreciate some help with this issue I'm having. I am working on a 2003 Dodge 2500 with a 5.9 Cummins. 229,000 miles. Initial complaint was a really rough idle and lots of white smoke. I did a cutout test. All 6 cylinders fluctuated at idle when I cut them out individually. I bumped the idle up to 1,000 RPM's and did a cutout. #4 injector did not change when it was cut out at 1,000 RPM's.



To start things off, I did a head gasket test. OK. Checked for blow-by with the oil fill cap removed. OK. Changed fuel filter. Found bacteria in filter (Minnesota Truck with Bio Diesel). Added bacteria treatment and fuel injector cleaner.



So I diagnosed the problem as a faulty injector #4. I removed and replaced all 6 injectors. Issue seems to have gotten better, but still smokes white and has a surge at 40-50 MPH. It feels likes its missing. Seems to have good power still. Accelerates great, but still smokes excessively.



Background on the truck, truck was bought with previously installed edge tuner. I have tried running the truck with and without the tuner hooked up and the issues seems to stay the same. Truck has been sitting and seen minimal run time for 6 months.



Any advice would be greatly appreciated. Thank you in advance.

 

I would start with a compression test and check your injector.