- Joined
- May 26, 2010
- Messages
- 8,495
- Reaction score
- 182
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- Location
- hell
- Vehicle Year
- 2007
- Make / Model
- Ford
- Engine Size
- 4.0
- Transmission
- Manual
Hey, my dad's got a 96 f-150, with a constant but varing intensity misfire that he's been harping on me to figure out.
it starting occasionally, and over the past month, has become constant, sometimes it is very minor, and can barely be noticed, other times the whole truck shakes violently.
the truck is a has a 5.0 5speed reg cab long box, it's been well maintained over it's 230,000 km (I think that's right) the exhaust pipe (before this, not sure about now) was SPOTLESS, and i mean like looked like galvanized steel inside, not a spec of carbon or any other contaminant. it was pinging rather bad for a while, getting worse, so a large tune up was done, plugs, wires, cap, rotor, was done about 2-3 months before this happened, new belt, new idler pulley, new shoes, pads, rotors, drums, and front bearings were done about 2 weeks before this (him and I did all the work) there is NO CEL, but don't have a code reader to check to make sure no codes. the truck is pretty much all stock, no major modifications.
so far I have had him check inside the cap, he said it was "a little crusty, but not bad" not sure exactly what he's meaning... he suspects compression issue, but goes on to mention "miss is the same cylinder, can be worse or better during a trip" which leads me to think electrical, not compression. neither of us has a compression gauge though, so we can't check at the moment. I had him check the resistance of his new plug wires, to make sure they are all good, they all came back between 6 and 8.5 ohms, which is a little larger of a distribution that I would have liked to see, but doubt that is the problem now.
any thoughts at all?
it starting occasionally, and over the past month, has become constant, sometimes it is very minor, and can barely be noticed, other times the whole truck shakes violently.
the truck is a has a 5.0 5speed reg cab long box, it's been well maintained over it's 230,000 km (I think that's right) the exhaust pipe (before this, not sure about now) was SPOTLESS, and i mean like looked like galvanized steel inside, not a spec of carbon or any other contaminant. it was pinging rather bad for a while, getting worse, so a large tune up was done, plugs, wires, cap, rotor, was done about 2-3 months before this happened, new belt, new idler pulley, new shoes, pads, rotors, drums, and front bearings were done about 2 weeks before this (him and I did all the work) there is NO CEL, but don't have a code reader to check to make sure no codes. the truck is pretty much all stock, no major modifications.
so far I have had him check inside the cap, he said it was "a little crusty, but not bad" not sure exactly what he's meaning... he suspects compression issue, but goes on to mention "miss is the same cylinder, can be worse or better during a trip" which leads me to think electrical, not compression. neither of us has a compression gauge though, so we can't check at the moment. I had him check the resistance of his new plug wires, to make sure they are all good, they all came back between 6 and 8.5 ohms, which is a little larger of a distribution that I would have liked to see, but doubt that is the problem now.
any thoughts at all?