I just picked up another RX7 and am trying to diagnose this problem.

If I drive the car normally everything seems to be fine, but if I apply any power the car accelerates like it should, but as soon as I take my foot off the gas pedal, the car violently jerks. Almost like the rear end is trying to kick out or something??

I have a tiny bit of movement coming from the rear tires if I jack them(bushings are just a little worn), but I don't think that that has anything to do with it. . .?

 

Check your powerplant frame carefully for cracks and also that it's properly tightened down. Hell, for that matter get the car on a lift and inspect and check all fasteners closely. Also make sure you have the rear strut tower bar bolted securely in place.

 

Also make sure the rear tires are at the proper air pressure (around 32psi). If one tire or both is low, the rear end will do weird stuff.

Dale

 

Your diff bushings are shot. Raise your rear end and inspect the diff bushings for leakage. You can replace with solid units.

 

Thanks guys for the help. The problem is better, but still not 100%. The tire pressure was wayyy off and the front outer tie rod ends were shot. I replaced those and it is better, but looks that the rear differential bushings are done too, so I am going to order those.

 

i had the same problem, i replaced my diff bushings and havn't had a problem since.

 

How are the pillow *****?

 

How about if he has aftermarket wheels/tires? Meaning bigger than stock?

 

check rear toe links. Mine went loose which caused the rear end to be loose.

 

That has no effect on the proper tire pressure. Usually when you move to larger diameter wheels the sidewall of the tires is less, meaning your overall rolling diameter stays about the same.

 

I think I am getting the same thing too but only started happening after checking the bushings in the front end.

Ordered the upper A arm bushings so far and will go from there.

What's the best place to get the diff bushings from?

 

Thanks for the tip.

Because of that, i bumped my rear tire pressure up 3lbs and it cured my steering wheel jiggle at higher speeds quite dramatically. I know i still have a suspension issue present but at least my drives are more tolerable now.