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6.0 stutters/hiccups/blows smoke
6.0 hiccups and blows black smoke...usually when heading up a good hill or mountain around 50-65 mph 2,000-3,000 rpm. (2005 f-350 6.0, 112,000 miles)
At first I thought it was fuel related/cold temps outside, adding diesel supplement seemed to help, but not anymore. Changed both fuel filters twice, and changed air filter after noticing a "flapping" noise coming from intake...still no luck. Hooked it up to snap-on computer and it came back telling me trouble with 8th cylinder....but then when the shop started it up the next day, the code wasn't there and the truck wasn't acting up, so I drove it down the road, got five miles away, and it started acting up again. I took it back to the shop, and it didn't show a single dang code. Did an injector test with the computer and everything showed fine.
Best I can describe it is a stutter/hiccup with a flapping noise coming from the front intake side (next to radiator) and seems to miss like crazy. Haven't had any luck with finding any fuel/water strips to test it, but have run tank just short of bone dry, changed filters, and put heat in with new tank of diesel. Have been getting diesel from different truck stops, so I can't exactly rule out the gas station, if fuel seems to be the culprit. Ran it today to the jobsite and ran fine for the first half the day, then this afternoon it started acting up again. Thought it might be EGR, but again, not getting any codes.
Thanks for ya'lls help in advance!!
Great site, I just became a member, but I've been following for a good long while and have learned a good bit!