Last post on Sep 01, 2013 at 2:42 PM
You are in the Ford Expedition
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Ford Expedition, SUV
#85 of 89 Re: noise accelerating or decelerating [ddale1]
Apr 09, 2012 (8:44 am)
I am re-posting this now since it was 2010 when I first solved my problem and posted it here. Following is the original post:
Jun 28, 2010 (1:43 pm)
I had the rattling sound from the wheel area too. I took it in to the dealer and they rebuilt part of the transmission which did not solve the problem. The service manager took an interest in the problem and figured it out without lifting the hood. Seems that there is a vacuum valve that controls the 4WD hubs and when they get old they start to leak and the hubs are trying to engage at high speed which causes all the noise. I've got a 2005 Expo with about 50M miles on it. Until now I had never had a problem with it. Once they put the new valve in the noise went away and hasn't come back in a month.
PS. The truck now has 90,000 miles on it and the rattle has never come back.
#86 of 89 Re: 2007 Expedition buzz/vibration 1500-1700 rpms [dakota123]
Jul 01, 2012 (7:25 pm)
Can't believe it's been over 3 years since I posted that. I had been living with this very annoying resonance (and RPM jump that made driving in traffic somewhat jerky) for the last 30,000 miles, but since it wasn't getting any worse, and nothing blew up, I let it go.
Finally had the time today to act on a hunch -- I solved this by making sure that the tube running from the air filter housing to the hard plastic inlet at the throttle body was pulled taught against the filter housing before cinching the large hose clamp. My clues were 1) the RPM jump that accompanied the buzzing noise -- that seemed to me (coupled with where the sound seemed to be coming from) to point to the inlet tract; 2) sometimes after checking or replacing the air filter, the resonance would be reduced for a couple of days. I took it for a very brief drive with the air filter housing top loose today and could hear a change in tone when the resonance was taking place as compared to with the filter housing in place.
There are several resonance chambers built into the inlet tract, so apparently having the right stiffness and/or geometry of the assembly is important.
Hope this helps someone else someday.
#87 of 89 2007 Expedition with vibration
Aug 28, 2012 (9:46 am)
I have a 2007 Exp Limited EL with 70k miles on it. I recently put new tires on it (July 22) and I have a very noticeable vibration once I hit 75mph. I had a vibration before, but we thought it was because the tires were definitely ready to be replaced. The new wheels have been rebalanced and I've taken it to Ford. I had them check the tie-rods, steering box, and nothing. They took it for a test drive and the mechanic didn't feel anything. I've taken it to some friends of mine that are mechanics and they felt it easy enough and said something is definitely wrong. The said the vibration feels more side to side instead of like a rumble strip vibration. The wheel bearings have also been checked. We're at a total loss. Any ideas? It seems to feel like it starts in the back and works its way up. Not sure what else to look at, could it be the drive shaft?
#88 of 89 Re: 2007 Expedition with vibration [kegel0216]
Aug 28, 2012 (10:14 am)
Does the vibration come and go, i.e. is it smooth for a short while and then increase? That's often the way it goes with tires out of balance.
Where did you get your tires? Hate to say it, but I've had rotten luck with places like Walmart, or even discount tire places. My theory is that they get 'seconds', with hard spots in the rubber etc.
Also, tire balancing is an art, especially with big, heavy tires. The shop should index the tire to the wheel (find th high and low spots on each and set them up so they cancel out.) If it seems like you're not getting anywhere with one shop, try another. I finally found a shop that was able to make a huge difference with my Expy -- The local Ford dealer had no clue, nor did the Big-O tire shop. A road-force balancing machine may help.
Driveshaft issues will be different, much smaller in amplitude but higher in frequency, 2000 hz or so, same as the engine RPMs in 4th (the six-speed in the Expy actually doesn't have any gear with a direct 1:1 ratio, but close enough) and not tending to come and go. If that's it, either replace or balance (you can try indexing it as well by matching the high spot of the driveshaft with the low spot on the engine and/or diff flanges.
Very frustrating thing, I know!
#89 of 89 Expedition lugging and knocking.
Sep 01, 2013 (2:42 pm)
Hey there, i have an '04 expo, and until recently has been running fine. within the last two to three months, things seem to be going down hill quickly.
My acceleration is very poor, there is a strange knocking in the rear of the vehicle. overall power is almost non existent. and i have no idea where to even begin when trying to fix the situation. can any one please help me with this one.