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2007 - 2014 Expedition & Navigator 2007, 2008, 2009, 2010, 2011, 2012, 2013 and 2014 Ford Expedition and Lincoln Navigator

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Old 11-15-2011, 02:05 PM
ibyers ibyers is offline
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2008 left/rear thump, at a loss.

Hey Guys,

I have a weird “thumping” noise coming from the rear drivers side wheel area.

It does it only when I hit a bump and seems to do it more when I am slowing down/breaking. The very odd time it goes from a loud single bump to almost a vibration. I have only heard it do this once, but my wife said it has done it a couple of times. The vibration only seems to do it while braking over a large bump, but again it is rare.

It sounds more like it is coming from the inside than the outside. I took the wheel off and checked suspension. I thought it might have been a loose shock mount, but everything is tight. I had my wife drive while I sat in the back, and it is almost like it is coming from the inside, but I have no idea what it could be. I might have thought it was the sub with a loose connection (is it in this area?) causing it to “thump”. When I had the tire off it appears the brakes are new (new pad and rotors)

It is not the access panel to the jack or the jack itself, as I removed them and it still did it. I also tighten the spare tire as I thought that might have been bouncing.

I’m at a loss.
Thanks everyone!
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Old 11-15-2011, 02:17 PM
kennisonxgs kennisonxgs is offline
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It could be the traction control. Mine does it mostly when turning over a bump at slow speed.
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Old 11-15-2011, 02:33 PM
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good call, never thought about that.

Now is this a normal sound? lol
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Old 11-15-2011, 02:58 PM
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The Thump is pretty loud. you can hear it over the radio.
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Old 11-16-2011, 01:49 AM
kennisonxgs kennisonxgs is offline
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Mine is loud enough. Whether or not it's normal--I'm not sure, but mine has been great so far. I don't know how loud your radio was at the time, so I can't comment on that.
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Old 11-16-2011, 06:33 PM
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Just curious do both you guys have the rear air suspension?


Matt
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Old 11-17-2011, 02:20 AM
kennisonxgs kennisonxgs is offline
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No, no air suspension
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Old 11-17-2011, 11:50 AM
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Did you check the spare tire? Might be loose.
Had that happen on a truck once. I felt real stupid after checking everything but that for the issue.
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Old 11-19-2011, 12:52 AM
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Quote:
Originally Posted by function12 View Post
Did you check the spare tire? Might be loose.
Had that happen on a truck once. I felt real stupid after checking everything but that for the issue.
Hi Function,

I did check the spare tire. Unfortunately it did not solve it.
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Old 11-19-2011, 12:53 AM
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Quote:
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Just curious do both you guys have the rear air suspension?


Matt

Hi Matt, No air suspension.
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Old 11-19-2011, 12:56 AM
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Quote:
Originally Posted by kennisonxgs View Post
Mine is loud enough. Whether or not it's normal--I'm not sure, but mine has been great so far. I don't know how loud your radio was at the time, so I can't comment on that.
Radio was not really that loud. can still have a convo with the passenger.

as I was pooking around tonight trying to find the source, my son slammed the passenger door and I heard the thump in the rear. So I am leaning away from suspension. the more I think about it the more I am thinking sub with a short.

Is the sub in the rear drivers side under the window?
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Old 11-19-2011, 01:02 AM
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Quote:
Originally Posted by ibyers View Post
Is the sub in the rear drivers side under the window?
yes

the plastic moulding has a grille looking thing behind the drivers 3rd rear seat. that's the sub. I had my Expy for >1 yr before finding out I had one
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  #13  
Old 11-20-2011, 10:47 PM
ibyers ibyers is offline
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Do you guys think it might be a loose body mount?
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Old 11-21-2011, 12:37 PM
kennisonxgs kennisonxgs is offline
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Quote:
Originally Posted by ibyers View Post
Do you guys think it might be a loose body mount?
That is a possibility as well. Unless the body mount is visually bad, it's going to be very difficult to say it's the cause if the noise is not easily reproducable.
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Old 11-21-2011, 12:37 PM
 
 
 
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