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Car Forum / Ford / Ford Trucks / May 2006shaking F-150
Hi, All, Just wanted to bounce this off of the Ford truck gurus hanging out in this NG, as I'm not finding any real specific answers doing general 'net crawling. Recently, my 2004 F-150 Supercrew began an odd vibrating/shaking, usually when on the highway accelerating through 40-50 mph. It came on without any warning one day. It's speed-sensitive, but not in frequency, only in intensity. It shakes the damn wipers right up off the windshield, then it goes away at about 55 mph. You don't really feel it in the steering wheel. It's mostly in your feet and butt. But, now here's the frustrating rub: it's intermittent. It'll go days at a time without doing it. It's been so elusive that I haven't brought it to the dealership yet because, frankly, I was never 100% convinced it wasn't just the road surface. I have ruled that out, at least to my own satisfaction. I've checked the obvious things like tire-pressures and wear-patterns, but otherwise I'm at a loss. Most of the things I think it *may* be don't seem like they would present themselves in the on-again/off-again way that this has. An employee at a local tire-chain eye-balled the wheels and didn't think it sounded like a tire-balance issue, and suggested it may be the rear alignment. I'd never heard of alignment "giving out" all at once like that. Does that seem plausible? Would a repair technician be able to suss out a mechanical problem even if the truck wasn't presently in one of "shaking moments"? Any leads/experiences anyone could offer would be greatly appreciated. Thanks in advance, S-M > Hi, All, > [quoted text clipped - 33 lines] > > S-M It is probably the e-brake. Had the same on my 04. If the e-brake is very tight, have them back off a little. On mine the pedal only went down about one click. If it is not very tight, take it in. There is a TSB for the problem. > It is probably the e-brake. Had the same on my 04. If the e-brake is very > tight, have them back off a little. On mine the pedal only went down about > one click. If it is not very tight, take it in. There is a TSB for the > problem. Holy sh!t, Marlin, Unbelievable. The other new trick this particular truck was doing was not letting up the e-brake pedal all the way when I pulled the release! The indicator light would stay on. I would have to reach down with one hand, hold the release, and pull the pedal up with the other hand. When the light went off, I let go of the release handle. I figured I was good at that point. Never in a million years would it have ever occurred to me there was a correlation. I'd have been chasing my tail for months on this! Don't know how you put that together, Marlin, but, sincerely: I'm impressed. I'll bet you that's exactly what it is. I'll try it. Hope it works. Thanks much, S-M >> It is probably the e-brake. Had the same on my 04. If the e-brake is very >> tight, have them back off a little. On mine the pedal only went down about [quoted text clipped - 21 lines] > > S-M In my case it was easy. When I would get out of the truck, I could smell the brake hot brakes. Wind just happened to be from the right direction. In my case all that was needed was to back off the adjustment on the e-brake. Had that done over a year ago and no problem since. Hope that fixes your problem. No guarantee, but probably 9 out of 10 with a vibration problem from the rear that comes and goes is going to be the e-brake on the 04. > Hi, All, > [quoted text clipped - 33 lines] > > S-M Just a guess but based on the fact that you don't feel it in the steering wheel, I would suggest a close inspection of the drive shaft and u-joints attached thereunto. The drive shaft should have a weight on it to balance it and the u-joints should not have any play and be firmly planted in the shaft yokes. Dave D > Just a guess but based on the fact that you don't feel it in the steering > wheel, I would suggest a close inspection of the drive shaft and u-joints > attached thereunto. The drive shaft should have a weight on it to balance > it and the u-joints should not have any play and be firmly planted in the > shaft yokes. > Dave D Hiya, Dave, Good to know, albeit over *my* head, from a skills/knowledge standpoint. I hope it's what Marlin suggested, as that's clearly the lesser of two evils. If it's not the e-brake issue (fingers crossed), I'll be armed with your observations when I head into the shop. Thanks for your thoughts. S-M Sounds like classic early symptoms of universal joint failure. I'd get it into the dealer, or garage of choice, pronto and have the drive shaft checked also. > Hi, All, > [quoted text clipped - 33 lines] > > S-M  Signature********************************************************************************************************************************** David F. Mishiwiec Sr. ********************************************************************************************************************************** > Sounds like classic early symptoms of universal joint failure. I'd get it > into the dealer, or garage of choice, pronto and have the drive shaft [quoted text clipped - 12 lines] >> windshield, then it goes away at about 55 mph. You don't really feel it >> in the steering wheel. It's mostly in your feet and butt. 45mph or so is the natural oscillating frequency of the suspension on must cars and trucks. That's why shaking at this speed always turns out to be a tire. If it's not a tire, it's something that can put vibrating energy into something that's unsprung. It could be a ujoint, but the driveshaft turns about 4X times faster than the tires, so usually if they shake at 45 they'll shake much better at 10 or 15. Less energy, but it's pure shaking at that speed rather than a blinding fast hum. It could also be something orbiting in the front axle - a loose CV joint there for instance. Since it's intermittent, it makes some sense, at least I think so. Whenever I get shaking like that. it's usually dried mud on the wheels. Intermittent as can be, too.
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