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Help please similar but maybe different?
Thanks to anyone who has ideas, first off; second, I am not a forum user and there are probably rules to follow that I do not know, so if I err...sorry.
As with the first person who wrote I too have a "miss"?? when towing up a grade.
It is not like a spark plug wire or that kind of miss more like a "surge" sort of slight but felt more in the seat than anywhere else not noticeable in any gauges (boost, tach, egt, ). Not WOT ( I never go WOT, quite) and if I back off of the throttle a little the surge or miss will often go away or diminish. Also seems worse if trans is not locked up, or is in 3rd(?), not o/d. The feeling is almost like bucking on an uneven asphalt highway. This only happens up a grade. This has been going on a long time but seems worse in last couple weeks. Not fuel filter related, there have been several filters replaced along the way w/out any difference. EBP sensor was replace in May w/no change, ICP sensor replaced three weeks ago and seemed better for about a week...
I tow 38 ft 5th wheel all the time, most recently east bound from Knoxville to Nashville and then to Memphis and there are a few pretty good pulls on I-40 along that route that caused the problem. Additionally, my exhaust brake is innop most of the time and I have convinced myself that the problem there is the accelerator pedal as I can "coax" the exhaust brake to work if I "manipulate" the throttle just right. Could that be the miss also?
'02 7.3 F350 4wd crew cab 310,000 miles, Banks turbo w/ bighead, banks exhaust, Banks trans-command, Banks Big Hoss chip (happens with chip in or out), Banks exhaust brake (all Banks stuff has about 170,000 miles on it).
Fuel econ same now as 5 years ago, oil usage also same, injectors, (original), were tested three times in last 8 months by three different shops, (1 Ford dealer), buzz test also three times, fuel pressure tested three weeks ago w/inline gauge on highway, fuel pressure solid and strong.
Paying for repair is not issue, paying for nothing being accomplished, well that is a different story.... any help here is appreciated.