Join Date: Jul 2011
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Engine Miss when warm
My 04 6.0 F350 CC started having issues only after long highway run over 40 min or so. when i would get off the freeway and come to a stop the truck starts having a miss completely random miss that shakes the truck. sometimes happens 3 times every couple second sometimes more sometimes less. sometimes the miss is hard and really shakes the truck and sometimes small and barely feel it. No odd noises are made only a split second of no noise cause of the miss. This problem has slowly got worse to the point now of maybe only a few minutes running and it starts to happen lightly. Never dies. Starts everytime no prob and runs smooth till warm.
Took the truck to Mech. who charged me a few hundred to tell me i have no codes. "NO ****," right i new that. anyways they did the key on engine off and key on engine on thing and nothing. They cleaned my EGR and said they couldnt replicate the problem it was prob dirty EGR causing it. Drove it home and truck did it on the way home. Called the Owner and told him my feelings on the matter so we went for a ride. Hooked computer and dont you know it started doing it just like everytime i drive it. Must have been one lucky ride for it to not do it 1 time in 100+ drives.. anyways computer shows nothing out of the norm FICM at 48 ICP within norm. A slight drop in the 1,4,7 injectors around the same time the misses happen but nothing substantial and not really any lower than other cylandars. His guess says replace injectors but thats too expensive of a guess for me. Any body have issue like this and fixed it. Whats left that the computer wouldn't see.
He could not see fuel pressure with his computer. How can I check this?
Truck is not tuned has 102,000, Clean egr, Regular oil changes with filter, recent fuel filters <2000k. 15w40 rotella. Have guages turbo boost is 20 to 25 WOT, trans runs at 160, EGT below 800 most times jumps to 1100 WOT. Stock engine no delete or upgrades.
I have slowly noticed more lag off the line than normal with black smoke from pipe. Not much but more than normal.
Removed air intake pipes and spun turbo shaft spins super easy no play in it. I dont think the turbo could cause a miss though. Im no mech.
Any ideas or advice is greatly appreciated.