Vibration when accelerating hard?

[Gary H]

As the top says, coming through the wheel and through the 'back-end' under hard acceleration.

I presume it's a matter of elimination, but my questions:

-Could bad alignment cause this?

-Could a worn rubber bush in a suspension component?

The wheels have recently been balanced, so not an issue when keeping a constant speed.

Cheers

[White987S]

Could be a lot of things. Even bad motor mounts.

What year is your car? Mileage?

Have someone drive behind you, and accelerate. Do they see your exhaust tips dip up & down? If so, it could be worn motor mounts.

[1schoir]

As the top says, coming through the wheel and through the 'back-end' under hard acceleration.

I presume it's a matter of elimination, but my questions:

-Could bad alignment cause this?

-Could a worn rubber bush in a suspension component?

The wheels have recently been balanced, so not an issue when keeping a constant speed.

Cheers

Gary:

You didn't say how much mileage and what year Boxster, but one easy place to check is the engine mount, a common failure point.

Here's a link to Pedro's Garage page on inspecting and replacing the mount: http://www.pedrosgarage.com/Site_3/Install...gine_Mount.html

Let us know what you finally determine as the cause.

Regards, Maurice.

[therock88]

Based on your conditions I would bet worn motor mounts too. If it was an alignment issue you would only feel a pull depending on camber/caster/ or toe issue....And if it was a balance issue you would get a shake most likely...more pronounced in the 50-60 mph range, but not related to acceleration. Also with worn suspension bushings, you would most likely get a shake, or clunk all the time.

So I agree it is likely motor mounts.

Good luck!

DC

Edited January 27, 2010 by therock88

[Gary H]

Thanks All - The car's a 02 986S with 114K now, so most things will start to perish :)

Will definitely check the mount tomorrow - but would/should it manifest itself in other ways, such as should you be able to feel it when dipping on and off the throttle?

Edited January 26, 2010 by Gary H

[Gary H]

Had it up on a ramp today and as suspected, the front engine mount was completely fubar.

Thanks all!

[1schoir]

Had it up on a ramp today and as suspected, the front engine mount was completely fubar.

Thanks all!

Gary:

Glad you sorted it out, and thanks for confirming our suspicions!

Regards, Maurice.

[Moonstruck]

Was it the engine mounts?

 

I have the same problem on my 986S, and replaced the engine and trans mounts. They were worn out, and needed replacing anyway, but didn't fix this problem.

 

It's definitely not a buckled or unbalanced wheel either.

 

Any other suggestions?

 

Thanks.