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At my dad's shop tomorrow, a super duty v10 will be coming in. apparently it has been to 2 other shops in the area and no one is able to figure it out. i don't know the exact specs on it, but what i do know is that it is a 99-02 v10. the problem it has is that at no matter what speed it will begin to buck, but will smooth out soon after. we haven't test drove it, but the owner says it happens frequently. the other shops think it might be a fuel related issue like a pump. anyone else had this problem?
Of course a fuel pressure gauge will end the fuel question. Take it up a steep hill and get on it if it goes at first then starts to bog thats fuel. Gonna need lotsa fuel under those circumstances...Could be an intermitten coil.....Hard to say without driving it...
What do you mean by buck? I had a 97 Taurus that would sputter at low RPMS, (under 1300), and this was not any simple issue like a fuel filter or simple tune up maintenance. Let us know more.
Buck? My Bronco was bucking! I first thauht it was the trans was going out. You know like slipping out of gear.
But when it finally quit. I found the problem was in the ignition system!
I think a fuel system problem would be more like a sputter, than a Buck!
I was thinking the same thing. I had two bad COPs after I changed plugs. My truck "bucked", etc usually on accleration and then smooth out while cruising. My scanner read the pending codes and showed misfires on two cylinders. I swapped in new COPs and problem gone.
Either way in this thread you have the basics covered, fuel, air, spark.
I second the fuel filter. I've seen a E250 that would drive fine at low speeds but when you got to 45 or above it would start to buck a lot. Turns out the fuel filter was shot. Our mech blew chunks of rust/crud out of the filter just by blowing in it.
ok here's an update. on the first test drive this morning, it didn't do anything. we put it on the four post an saw that the fuel filter was the original one the truck came with, which was rotted pretty bad (we replaced it). oh and by the way it is an early 03 with 58,000 on it. then on the 2nd test drive it did it. really bad buck and definitely a miss somewhere. we hooked it up to the snap on modis, but nothing came up. to make it worse for the owner too is that when he dropped it off last night he hit a deer and wrecked his bumper. he has only had the truck for a month and it has never not given him a problem. the guy took the truck because he needs it for the weekend but we'll be getting it back tuesday and we're gonna try to scope it to see which one is bad. we tried just about everything with the modis but just can't tell which it is. my guess is that the truck probably has never had a tune up either
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