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Hey friends! I recently took my 2003 Forester XT (~130k miles, 5 speed) on tour with my band and noticed a very bad vibration occurring while accelerating. I have noticed a slight "wobble" when I accelerate up hills before, but once I had the car loaded down with gear and people it became much worse. This is a "floorboard" vibration, the whole car was shaking and you could feel it in your rump. It seemed to get worse and worse as the road trip progressed, and once I unloaded the car it was back down to a slight wobble.

I did observe a few things on the road;

The vibration happens at a certain MPH, roughly 60-65 and 75-80. This is in 4th gear and in 5th gear, so it doesn't seem related to engine RPM
The vibration seems worse under heavier loads or up hills, and is only during medium to hard acceleration. As soon as I let off the throttle it goes away.
The vibration doesn't seem to be coming from any one corner, the whole car shakes
There is no noise from the front axles during turning
All of the CV boots are in-tact and not leaking

My initial thought is that one of the axles or the drive shaft is going bad. Figured I'd throw a post up here and see what you all thought of it.

Today I am going to start a little maintenance on it (fuel filter, spark plugs, air filter, oil change) then run a can of injector cleaner through it. Also I have a p0183 "fuel temperature sensor a circuit high input" I will hopefully fix by wiggling the connection, otherwise the whole fuel pump assembly is getting replaced. I am interested to see if any of this has an effect on the vibration.

Thanks in advance for any help or thoughts. Cheers.
 

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Sure you’ve figured the problem , but putting this out there for others with the issue. I had the same problem , went to pep boys they told me the lower right control arm needed replacement. I went to Subie Specialists in NoHo & was told all I neeeded to replace is the bushings. They did that & haven’t had the problem since.
 
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