Yesterday took a long ride in car. Stopped for a while and when I started back car felt like it was shaking side to side(so much so I stopped and checked all lug nuts and looked under car). After getting up to speed car felt pretty good then after stopping and starting again same thing is happening. Any ideas?

 

What year and model? I'll guess either a faulty tire (due to a slipped belt) or bent rim without having any additional information....

 

Car is a 99 xk8 and only does it at slow speed after stopping or turning

 

Check your motor mounts. I mean get under there and with large pry bar wedge the mount up and down. Look for any goop from the silicon filled rubber parts.

 

Gordo is right, having recently gone through it is wanted to add an idea. Don't do this in your garage.

Open hood. Step on brake hard. Press gas pedal and watch motor. With broken mount I could see mine move substantially.

John

 

Thanks guys. Soon as I can I'll check them out

 

I experienced something like this last Fall. My wife & I drove out to western Maryland for a weekend get away. The last hour of the trip was on a 65 mph highway and we drove that hour straight through. Once we got off the highway, our hotel was within 300 yards of the exit ramp. We parked the car and went into the hotel for the night. That night, the temperature dropped to a nice crisp fall temperature.

The next morning, we got in the car and as soon as we got to 30 mph, the car shook terribly - so bad that I too pulled over and looked for a flat tire. Finding nothing, we drove on. The car shook like that for another minute of two, until we got onto the highway for a mile or so, & then the car smoothed out to normal.

What I determined was that the soft compound of the tires had heated up on our extended highway trip and softened the tires even more. When we parked & they cooled, particularly with the fall night temperatures, the tires "molded" in a flat spot on each tire, which is what we felt the next morning, which worked it's way out once centrifugal force and friction (heat) forced the tires back into shape.

I'm betting that on a really hot summer day, you might get similar effect. Could be nothing more then short term flat spots on the tires...

 

Haven't had a chance to check motor mounts yet but I'm pretty sure it's not the tires. It does this when its cool, warm, or hot and only at slow speeds. Feels like a side to side motion.

 

May have found my problem. Motor mounts look good but l/r wheel bearing seems quite loose. Looked thru procedure in manual and looks quite complicated and requiring several special tools. Anyone ever done this that can shed some light?

 

Anyone think wheel bearing would cause side to side wobble at slow speed or do I possibly have yet another problem

 

A wheel bearing would have to be pretty sloppy to be noticeable other than for noise.

You state l/r: do you mean at the rear? If so, there is some natural vertical movement (when the wheel is hanging free) that may feel like a wheel bearing.

Mike

 

Yes, l/r was for left rear wheel. I am just grasping for straws trying to figure out problem. At slow speeds feels like car is moving side to side but at higher speed does not feel bad at all

 

Hard to believe my problem is this unique. Would a bad belt in tire cause this sideways motion then straighten out and run good at normal speed?

 

Yes, a bad tire belt could cause that, very strange problem. Have you checked for a bent rim?

 

This thread started by Scardini is the nearest I could find:
https://www.jaguarforums.com/forum/x...4/#post1068503

Tberg had a similar issue but in his case it was much more severe (mentioned in the above thread)

Rear-end rebuild isn't on my list of stuff to do (yet) so I haven't the experience to offer any pointers. Does this post by GGG strike a chord?:
https://www.jaguarforums.com/forum/x...5/#post1473088

Do the simple stuff first: you can check out James' suggestion of a bent rim by lifting each corner of the car and rotating the wheel to see if there's any run-out. Or perhaps swop in the spare. Rim or a tyre would be my starting point.

HTH,
Mike

 

I would not think a rim is bent cause only I have drove car since having it and problem just started. Tires are in good shape as far as tread but quite old. Was planning on replacing in near future but not right now. As stated earlier car only does this at low speed. Almost feels like a side to side motion

 

I'm going with what was mentioned earlier about a belt coming apart in one of the tires. It really needs to be on a lift,
"Trac Off" needs to be lit up and someone needs to take it up to 30 mph. Or put in neutral with engine off and spin each tire by hand and watch the bottom of the tire for excessive up and down movement.

 

My problem wasn't so much shaking as the whole rear end seemed to feel like it was coming around the side of the car to the front. It was damaged rear hub (bent) that made the driver's side rear wheel wobble above about 45mph. It was the scariest thing I ever felt driving a car. Below that speed you would not have noticed. I would check all the wheel bearings and hubs just to rule out this dangerous possibility.

 

How old is 'quite old'?


M

 

I knew they were old cause they had cracks but just went and checked and they are 12 years old. Guess tires are in my immediate future��