Just wanted to pass this along to anyone else in this predicament. I recently did alot of work to my girlfriends Tribute, and when all is said and done, there is a misfire on #1 cylinder ALL THE TIME. I tried swapping the coil packs around, and even changed the fuel injector around (what a bitch). I did a continuity test from the PCM wiring harness to the coil pack and the injector...everything seemed good. I was convinced it was a bad PCM.
When I put it all back together to try it one last time, the Tribute ran smooth! Wow...wtf? I wiggled the harness going into the PCM and then it ran crappy again...wiggle it the other way, and ran smooth! ah-ha! Found the green/white wire going into the PCM and noticed a slight kink in the wire. I pulled on it and it streched. I cut and respliced and soldered/heat shrink it back together and everythign is good again. Happy Happy!!!!
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Thank you, Thank you, a thousand times Thank you! I have had this problem for about a year. I pulled the green and white wire and it easily stretched and broke. The wire inside was brittle and black. I cut out the bad part of the wire and spliced in a jumper. As soon as I started it, the light went out and it has been running smooth ever since.
I know how u feel!!! This is what the forum is supposed to be about! Sometimes people solve their own problems and then forget to put it on the forum for people to learn. I'm glad I helped solve someone elses problems. This made my day! Now if you can return the favour and help me with my issues with the girlfriend!hahahah!
I have the same problem, but not sure if I have the same solution. Single cylinder misfire, cylinder 1. I've related the cop, injector, o-rings, intake gaskets, PCV hose and several vacuum hoses. My 301 is accompanied by a code 171, lean condition bank 1. I have a feeling they're related, since I pretty confidant about the vacuum hose and such, and if that cylinder is getting little/no gas, that would create a lean condition, right?
I was wondering if someone could post a pinout for this PCM? I have a 2001 4WD V6, and I've taken that cover off the wires coming out of the PCM, but they look to be in pretty good repair. I think the grn/wht wire that solve your problem would be lower right, labeled pin 1?
I had the exact same problem with the green/white wire in the harness at the top center of the firewall. There was a break in the wire inside the insulation. The break came from fatigue. I cut the wire open and soldered it back together. Problem solved.
One way that I checked to see if fuel was getting into the engine, is that I took off the plenum intake, and disconnected all of the spark plug coil wires, and had someone turn the key over and see how the injectors fired. To be honest I did it all myself, I disconnected the positive off the battery and then I jerry rigged a screwdriver into the key slot and tie wrapped it to the steering wheel so the key was always on. When I wanted to crank the engine all I did was connect the positive to the battery. But be warned, your spraying fuel into your engine and you get a bit of a spark when you touch the positive to the battery. I'd suggest have someone crank it over for you.
Are you in Europe? The only code I see is 304 misfire #4. When you replaced the plugs what did they look like? I'd suggest pull #4 plug if it is not bright white, swap plug wire with one close to it, see if the problems swaps to that cylinder.