I was wondering if some one can help me. I have a 04 RX-8 with only 45K on it. Just the other week my 8 was acting up at me. Some times when i would pass 5K RPM the car would shake. Can anyone help?

 

More input please! Is the car moving or are you just reving the engine while stopped?

 

The shaking occurs while im driving.

 

Sounds like you need a wheel balance....if it only does it at that speed or in between a certain mph , say like 45-60mph then get smooth before that or after that speed, i would bet the farm that you will need a wheel balance.

If your car constantly shakes after that speed and continues, you may have bigger problems and would need to get your car checked out imediately.

 

Sounds identical to a problem my friend had with his Celica - turns out his wheels were almost bald. He replaced them and instantly, problem solved.

 

either wheel(s) bent, tire(s) not balanced, or need alignment.

especially if it happens when u go fast. most likely wheel(s) bent and/or tires.

 

When my friend would hit about 80mph his car would start shaking, then after he reached about 100 it would smooth out. 2004 Celica GTS IIRC.

 

Yeah, I think it's the tires as well. I had the same issue once; at 65MPH I was shaking mildly and start to worry thinking something else was wrong. Needless to say, getting to work at 80 mph became a normal occurance just to avoid the shaking. Until I blew a tire (dontwannatalkaboutit). Now that the tires are replaced and she's balanced, no shaking.