Have Strange Vibration/Bouncing At Highway Speeds - Ford Powerstroke Diesel Forum
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Old 07-14-2013, 03:30 PM
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Have Strange Vibration/Bouncing At Highway Speeds

Hi, I am brand new to this forum, and this is my very 1st post.

I very recently bought a 2007 F-350 6.0 Powerstroke w/209K miles in the Tampa area (I live in Orlando area) that had been bought at auction in Houston, and driven to Tampa area. The interior is in super shape, as well as the exterior, except for bed and interior portion of tailgate. It had been a one owner (company) truck.

I took delivery, fueled it up in Tampa area and drove it to Orlando area with no problems. The seller mentioned a front tire had a slow leak. The next day I had tire repaired. A few days later, I went on a fairly long trip from east side of Orlando to far west side, down to Lake Placid (just north of Lake Okeechobee) to Ft. Pierce, then back home. During this trip I used less than 3/4 tank of fuel & got 18.5 MPG

As soon as we reached highway speeds (60-65 MPH), we had a weird low frequency bounce/vibration. I thought maybe they improperly balanced the tire. It kind of gets worse when going up hill like at a highway overpass, and is also worse than level ground going a bit downhill (but different than uphill).

I had also thought perhaps it is acting like a u-joint was going bad, so I checked for that when home, but everything seems quite tight.

I had tire shop rebalance tire, and they found a discrepancy, but a good balance did not help the problem at all.

Thinking maybe a motor mount problem, I rocked the truck in park, but engine seems rock solidly mounted.

Also, the engine has a bit of vibration around 1750 RPM when reving in neutral, but it is not noticed at all in the lower gears when driving.

Any ideas? Thanks!
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Old 07-16-2013, 05:08 AM
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Oh, come on! 37 views, and not a single idea what could be going on???
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Old 07-19-2013, 04:24 AM
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Update: I picked up my new 5th wheel RV yesterday, and going across town up to speeds of 50 MPH, the truck runs and tows close to 10,000 pounds just fine, even in tow mode, where is upshifts at much higher RPMs. No vibration/bouncing at all.

Anyone now have some insight at what could be going on at higher speeds?
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Old 07-19-2013, 05:10 AM
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Sound more to me like the driveshaft as well just out of curiosity have u checked the hub bearing they are known to go
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Old 07-19-2013, 05:27 AM
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Specifically which hub bearing?
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Old 07-19-2013, 05:35 AM
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Hubs are what hold the front wheels on. Jack up the front end and see if there is play in the wheel when pushing on the top and pulling on the bottom.

Ps. If it were me I wouldn't do any serious towing until I had a monitor and changed all the fluids/filters (motorcraft)
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Old 07-19-2013, 05:55 AM
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Quote:
Originally Posted by NCDeerHunter View Post
Hubs are what hold the front wheels on. Jack up the front end and see if there is play in the wheel when pushing on the top and pulling on the bottom.

Ps. If it were me I wouldn't do any serious towing until I had a monitor and changed all the fluids/filters (motorcraft)
I know what hubs are, and I already checked those. No play found.

"Had a monitor"? What in the blue blazes do you mean?
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Old 07-19-2013, 05:58 AM
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I would get a monitor so you can see all the trucks vital.
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Old 07-19-2013, 06:00 AM
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Write Up: Monitoring the 6.0L PSD. <--- Check this out, it's very important on the 6.0
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Old 07-19-2013, 06:51 AM
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Quote:
Originally Posted by NCDeerHunter View Post
I would get a monitor so you can see all the trucks vital.
I have no check engine light illuminated, so everything is hunky dorey.
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