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My RB25 »
https://forums.nicoclub.com/my-rb25-u61932.html
Fri Jul 06, 2007 2:39 pm
A bent rim can cause the vibration, so can poorly worn or old tires, so can a broken front end component. Usually side to side is a bad tie rod, but it can also be a ball joint I've seen both, although up and down play is assciated with ball joints.
This is what you do, jack up the car so the wheel is off the ground and you can get under there (Use jack stands!). Have a friend (you can do it by yourself, but on the ground it's a little tough) 'shake' the tire back and forth (this is with the car off...), look at the tie rod end and see if its moving around also take a look at your ball joint, since your under there might as well. Try to move the tire the same way but up and down. I would recommend checking both sides and if your gonna replace one, might as well do the other too.
It could also be a bad bearing, but that's a long shot and chances are it would produce some much more noticeable symptoms.