FordExcursions.com Forums
Keith Ruff
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• Manahawkin, NJ, USA |
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• Registered on 8/30/2004 |
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• 41 posts |
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 Posted:6/3/2007 10:23 |
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This has been an ongoing thread of guesses on many posts. I had a vibration at 70-75 mph for several years, up until the point it got severely bad and I thought my driveshaft was going to drop off the Ex. I had seen several posts about adding 3 degree spacers to the rear to lift the rear axle to better align the driveshaft. I never did that mod but did have the constant velocity joint replaced as well as have the driveshaft balanced. That took away the major vibration but I could still hear a resonant frequency vibration at 70-75. I was speaking to my friend/mechanic about this while he was doing some work to the Ex (including Radius Rod installation!) and he said he has a customer with the V10 Ex also who has the same problem. We found out that it is the motor causing the vibration, not the drivetrain. We sat in the car and revved the motor from 2000 rpms to 3000 rpms slowly and low and behold, there was that nasty vibration! It was at its worst at 2500 rpms or so, exactly the RPM's where I get the worst vibration on the highway at 75 mph! So now that we have figured out the vibration is not driveline related, the next question is, does anybody else have this same problem (after seeing so many posts about this, I would guess yes), is there a Ford TSB about it, and what can be causing this vibration/what is the fix? We were wondering if perhaps that pulley that is supposed to balance out vibrations (forgot the name of it) is either bad, not balanced, or should be replaced with a hydraulic unit or new OEM unit.
Any thoughts? |
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David Rush
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• Greenville, SC, USA |
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• Registered on 4/11/2004 |
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• 233 posts |
• 1 Vehicle
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 Posted:6/4/2007 06:46 |
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I had a vibration at 70-75. I had my tires road force balanced and it disappeared. You may want to give that a shot. 
David |
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Keith Ruff
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• Manahawkin, NJ, USA |
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• Registered on 8/30/2004 |
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• 41 posts |
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Posted:6/4/2007 08:00 |
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Vibration in engine can be felt while the Ex is in Park idleing, just give her some gas and rev the engine up to 2500 RPMS and the vibration appears. Never thought to try that until my mechanic mentioned it and felt it himself. |
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LANDYOT
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• Subscriber since 11/23/2003 |
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• Newport News, VA, USA |
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• Registered on 7/15/2003 |
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• 1,110 posts |
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Posted:6/4/2007 19:59 |
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Motor or transmission mount(s)? |
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Keith Ruff
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• Manahawkin, NJ, USA |
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• Registered on 8/30/2004 |
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• 41 posts |
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Posted:6/4/2007 20:49 |
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Mechanic checked them, said they were good. I'm thinking it may be some sort of harmonic balancer issue, dont know. Saw a TSB for Diesel Excursions that have this problem, says there is an imbalance with the motor, trans, and clutch. Some sorta fix by messing around with the flywheel bolts, wonder if this applies also to the V10... |
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David Rush
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• Greenville, SC, USA |
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• Registered on 4/11/2004 |
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• 233 posts |
• 1 Vehicle
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 Posted:6/5/2007 11:39 |
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Sorry didn't read the bottom of your first post. I would ask about the flywheel and possibly timing chain. There are 2 of those and supposedly good for 200K miles. Check plugs to see coils seated. These babies have been known to blow out plugs--so worth a check. Also--check that the heads are ok. These are just thoughts coming to mind....no bent fan blades???Also--does it do this with the AC on, off or both?? The old test for motor mounts was to have the hood up, put truck in drive--hold down brakes and apply gas. If the engine jumps up on one side then there is a broken or damaged one. Thats all the hare brained ideas I can think of right now.
VIBRATION 
David
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