A few weeks ago i'm going to work and my truck starts acting up. It seems at low rpms i'm getting a bad vibration. It's bad enough I think I'm gonna drop the driveshaft. I pull in to a parking lot and check out the drive line and everything looks fine. At that point i'm starting to rule things out in my head. In neutral I rev it and there is no miss. Low gears there is no miss or vibration.I drive it the rest of the way to work (5 miles) and call the repair shop. When i'm driving it seems to happen in high gear and if I give it enough gas it downshifts and goes away. The shop tells me I need the tranny fluid changed. Well they managed to nick me for $200.00 for a fluid change and tell me to keep an eye on it. In their expert opinion it might be the torque converter. It was fine for about 2 weeks and this morning it started again. Anyone have any ideas?

2000 Excursion V10 4X4 204k miles !!!

 

Does sound like a bad torque converter...

 

could be a sparkplug going bad. My ex had a bad plug.You could hear a miss at idle but when your on the gas all seems fine. As soon as it hits overdrive it started vibrating like a bad tire. Gased it enough to come out of od and alls well again. After I changed the plugs never happened again.

 

Yeah, you're right! It could very well be a bad COP or two!

 

I agree with Ken. How long has it been since you changed the COP boots and plugs? Could have one arcing to ground.

Eric

 

A miss has been mistaken for a transmission problem due to the bucking and jerking a miss can cause, and most often noticed in high gear.

 

I just had two COP/Plugs go bad and I would have sworn it was the tranny going out. And, I got no codes or CEL for the packs. If I had to bet, I would say it is a coil pack or two.

 

I had the same thing happen to my '00 Ex 5.4L @ 120K miles. Took it to local tranny shop. Tech hopped in with a Snap-On OBDII scanner and drove it for about 5 minutes.
He said it was mis-firing, but could not tell me which cylinder(s). Definitely not tranny.

You need a diagnostic scanner with additional diag software (Level II, II think)
I brought it to a shop that had the same Snap On scanner with the Ford Advanced Diag module. Missing on 2 & 7. I had already done all 8 COP boots & springs, so I swapped ou the 2 coild and the problem was solved. I never got a check engine light with this, but the misfire codes were in the ECU's memory.

 

Sounds like an engine miss to me too.

 

I had this happen the other day on my 00 X, then it went away. So it could be a cop going bad? How can you test these, or what can you look for? Mine has 122k on it and has never missed a beat until then. I am not sure if the plugs were done at 90 or not, but it sure has run great since I've had it, 2+ years.

 

My truck has had those systems twice, once when I first bought it and it needed 2 COP and last week when it needed 1 COP. At this frequency I would like to know where can I get a discount priced COP since Ford charges almost $180 parts/labor each one. My check engine light never lit up and the dealership has to put it on the computer to pinpoint which one.

 

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You can actually buy rebuild kits for these coil packs. Complete with the "spring and rubber boot" I had the same thing happend to me a few times. Usually after I am a dumb *ss and "wash down" the v-10 to keep her lookin pretty. Id bet the farm its a bad plug or 2 and or a couple of bad coil packs. Shop around. 70 is exhorborant. I can get them much cheaper...wholesale.

 

That is what my truck did when one of my coil pack went bad.

 

yeah sounds like COP to me also.I just got through fixing mine.Let us know what you find