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I did post this same question in a introduction and Encho directed me here so here it is.....
Hi, just couple words about my vehicle, well in 2010 I got my self a 2010 Ford Econoline with 9k miles on it.
Now in 2013 it all ready has 270k. Im surprised too how good its holding up. Im using synthetic oil and doing oil changes every 7 - 8K +
I got couple of problems, I dont know where to post this since its a Econoline but here it goes.
I get vibrations when I go over 65mph which I could feel on my steering wheel and gas pedal. Now it seams too be a simple wheel balancing which I did 5 times and it didnt help.
All of my 3 local mechanics which one of them works for Ford are scratching their heads.
I have changed the all tires, shocks, rotots, breaks, all boll joints (alignment was done twice ) we also checked drive shaft and vibration didnt quit.
I got no one else to turn too about this problem. Some say its a torque convertor...
Is the vibration continuous, or just under load? Torque converter shudder usually occurs just as the clutch is applying and/or releasing while under load, and tends to be very brief. A complete fluid change will some times cure a TC shudder.
A bad COP ign. coil can feel like vibration, should be noticeable at lower speeds, more-so while in converter lock-up.
Is there a ladder rack or some thing out side the van that can catch wind?
If its just a bad COP it should have thrown a code however that being said it could also be a pending code, the ECM not yet ready to trigger the MIL.
I'd connect a good code reading scanner, see if anything stored shows any pending status.
Agreed a misfire can mimic a bad vibration, had one recently where the #1 COP had failed. The vibration wasn't "death wobble" bad but noticeable anyway.