I have a 1996 850 R and whenever i accelerate it shakes pretty bad, me and my dad were checking it out and we don't know whether it's suspension, motor mount, warped wheel, alignment, etc. can anybody help?

 

Care to add a better description? hard accel soft accel. what kind of shake? The better the description the more help we can be.

 

Well you and your Dad hit everything I would look into based on your description. Motor mount are known to go bad on the 850.

 

With what little information provided I'm like JimKW, I would first look at the motor mount.

 

Easy way to check the suspension is to jack the car up, take the wheels off and look. Check the csohcks for any signs of leaks, look at all the rubber bushings (Sway bar, end links, A-Arms, etc) and check the tightness of the bolts. Next I would check all the motor mounts and transmission mounts.

Are there any noises or a feeling as if something is loose when you accelerate and feel the shake?

 

it's when i accelerate a little hard, we're figuring it's the alignment cause it pulls to the left and we had a friend of ours (who's a mechanic) look at it and said that it could use CV Joints.

 

I had the same problem with my 850 Turbo. It ended up being a CV joint. When I stepped on the gas it would vibrate or shake pretty bad, but as soon as I backed off it stopped. Mine was the inside CV on the passenger side - it also did it very slightly going hard around a freeway ramp to the leftwhen the passenger side suspension was compressed.

 

Im not sure if there is much difference in engine mounts between a S90 and a 850, but when i first got my S90 it would shake when i went over 50 mph. Maybe a bad/missing/worn out engine mount?

 

Axle?
If the inside joint goes bad it will vibrate pretty bad when accelerating.
But also check the engine mounts.

 

Any new info on this? Mine has been doing the same thing, and it's getting worse, to the point where when I am going up a hill 70MPH the front end visibly shakes right and left. I have checked everything and don't see anything worn. I have replaced the upper motor mount, and the spring seat so I know those aren't the problem. I suspect inner cv, but it feels tight, no up or down movement, how do you check these? I really need to figure this out, because I am afraid with all that shaking that something is going to break or come loose!

 

I think I have figured out why mine is shaking, the lower right motor mount is shot. Once I get it replaced, I'll let you know if the shake is gone. By the way, Groton sells these mounts for less than $30, the cheapest I found locally is $85. I told the local guy how much I could buy it for, and he wanted to know where because that's less than he can buy them for!

 

Hie Guyz,
I have a '97 S40 that shakes pretty bad on the right front side when moving off. After that everything is ok besides having to compensate on the steering wheel to make the car go straight. What could this be?

 

Maybe bad axle or something in the steering system.

You might get alot more responses if you post in the S40 section.