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2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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  #26  
Old 09-20-2010
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starting to look worse and worse...
this was an almost new plug when I put it in last evening just before dark, the truck has only been run for maybe 15 - 20 mins since then.
what is that deposit of stuff at the end ?
almost looks like carbon buildup ?
not entirely sure.

as you can see though, the entire thread piece to the end is pretty burnt.
also, the crack in the ceramic that wasnt there before.
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  #27  
Old 09-20-2010
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looks like its running lean
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  #28  
Old 09-20-2010
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I havent a clue at this point, hell, my mechanic also doesnt understand.
simply removing a spark plug and putting a new one in shouldnt be giving these results, especially if the plug replaced was the one giving the problems....

Ive gone through all my wires, they are all seated good n tight, checked the coil and Im getting good spark from all points, ran a code scanner on it and came back clean, but its still running like on 5 cyl.

there is a slight amount of water coming from the tail pipe, but its nothing more than it always had, but there is a strong smell of carbon monoxide coming from the exhaust, no backfire, from either exhaust or intake. Im simply at a loss...
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  #29  
Old 09-21-2010
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have you checked the compression on that cylinder it sounds like you have a blocked catalytic converter or a bad fuel injector
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  #30  
Old 09-21-2010
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Im setting up to get a compression test in the next few days.
but I also think (hope?) it might be the cat, as far as I know its the original which means it has 170k on it.

Ive been going and going over it and I still simply cant understand how changing 1 plug could cause this much mayhem. even though it could have been something that has been building up, it really was so sudden. I mean, Friday, I drove the truck from Sebring down to Miami and back and it ran great, no torque loss, got decent mpg (on the way down), then 2 days later I change a single plug and now... this.
something else I should mention, but I dont really think has anything to do with it, but it might, is the plugs in the truck are motorcraft, but since I cannot get motorcraft parts anywhere near me, I got an Autolite plug. that said, the old plugs from a few months ago were autolite. my mechanic said its possible that it could be a bad plug, he says he has seen that a few times.
or that having two different brands could have an affect, but I do have a hard time believing that, but I guess anything is possible.
*shrugs*
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  #31  
Old 09-23-2010
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final update....
ok, so either its just my dumb luck, or I simply have to take the hard route....

anyways, I finally found the problem.
the new plug was bad, the old plug was bad, and the other plug I tried was ALSO bad.
out of 4 plugs I tried, only 1 was good...

so anyways, so far so good, my truck is running great as it ever has :)
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  #32  
Old 09-25-2010
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Have you been able to check if the misfire is coming from one cylinder consistently?
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  #33  
Old 09-25-2010
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no misfires anymore, Im thinking the original problem was due to a slight crack in the ceramics, then the new one I replaced it with was bad, and the new one after that was ALSO bad. (with a loose post, ceramic was undamaged)
Im hoping Ive resolved this, but I'll will still be putting it on a diagnostics computer soon, maybe within the next two weeks.

when I do, I will post back with info.
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