Join Date: Jan 2011
Location: Jamestown, NY
Thanked 2 Times in 2 Posts
iTrader Score: 1 reviews
Intermittent rough idle/rail pressure fluctuation
I searched the forum for a specific cause to my problem and found bits and pieces on a possible fix but didn't find the exact issue as mine
My mods are in my sig. Hot or cold I can have intermittent rough idle. My rail pressure is usually at 5k at idle and when the problem appears it will go to 4k back to 5k with slight rough idle. Or it can just have rough idle with no rail pressure change. ONE time I noticed my fuel pressure gauge fluctuate from 14psi to 13psi and then back up to 14 when the problem appeared but it's usually the rail pressure. The problem could last like a couple minutes and then be fine the rest of the day or not even show up for a few days at a time. And yes I did check for any bare wires!!!
I did read a post on where a gentleman had intermittent rough idle and it was his cascade overflow valve. I changed mine because the part was inexpensive but it did not solve my problem. Other than the rough idle issue the truck runs great. FCA maybe????
03 quad dually, 6" lift, 40" Donaldson, Raptor 100, CAT fuel filter/ Baldwin w/s, Smarty Jr, Pusher Intake, AFE Intake. one piece drive shaft, 09' steering upgrade, Amsoil bypass, Isspro gauges, HE351.
Last edited by monster diesel; 09-03-2011 at 06:02 AM.