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Vibrations at idle and when using heat or a/c

 
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mmumtaz3
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PostPosted: Thu Jan 05, 2012 2:03 pm    Post subject:  Vibrations at idle and when using heat or a/c Reply with quote

hey im getting some heavy vibrations while waiting at a red light and when using heat or a/c. Ive been told that it can be the motor mount but im not sure how many mounts there are in the 3.4.

I know theres 2 upper dog bones mounts and a right motor mount but is there anymore mounts that im missing

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mtl
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PostPosted: Thu Jan 05, 2012 8:55 pm    Post subject:   Reply with quote

There's the 2 dogbones and and a right engine mount and a left mount at the transmission
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mmumtaz3
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PostPosted: Thu Jan 05, 2012 10:37 pm    Post subject:   Reply with quote

so there is a total of 4 motor mounts?

Would this do the job:
http://www.ebay.com/itm/00-05-.....2eab54b355

I see how it has only one dog bone mount and 2 "Strut Bracket To Radiator Support " mounts

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mtl
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PostPosted: Thu Jan 05, 2012 11:50 pm    Post subject:   Reply with quote

That mount kit might be the right one but like you said it only has one dog bone and it has the other style transmission mount which I'm not sure if it's the correct one to what yours has. the price is good but the mounts are probably cheap china parts. I would want OE mounts if it were my car.

I wouldnt go through the trouble and expense of replacing all the mounts. I doubt all of them are bad or you would have vibrations and the engine clunking all the time. I think the dogbones go out most often and can be checked by rocking the motor.

I'm not sure what is causing the vibration but I would inspect and pry on the mounts before condemning them.
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mmumtaz3
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PostPosted: Fri Jan 06, 2012 12:13 am    Post subject:   Reply with quote

How would you be able to tell if the dog bones are bad? It seems that driver side has the vibration while passenger is fine and it can be felt in the floor in the rear

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mtl
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PostPosted: Fri Jan 06, 2012 12:29 am    Post subject:   Reply with quote

You can tell if a mount is bad because it will have excessive movement and usually make noise when pried on or the rubber is torn or sometimes a hydraulic mount will leak fluid. With the dogbones if you rock the motor they may have excess movement and clank.
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mmumtaz3
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PostPosted: Fri Jan 06, 2012 12:40 am    Post subject:   Reply with quote

Ok thanks for all you're halp, I'm just going to try replacing the dog bone mounts first and if it doesn't help ill try the motor mount on the right

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billy101
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PostPosted: Fri Jan 06, 2012 12:42 am    Post subject:   Reply with quote

What I did to notice if my motor/trans mounts were bad was to engage the parking brake and put the car in reverse or drive and give it a small amount of gas and see how much the motor moves. I have my dog bone mounts flipped and brand new trans and motor mounts and my motor doesn't move at all when I test it like that. My trans mount had 178k miles on it and was terribly worn, but i changed out the motor mount as well as the trans mount and all vibration/movement of the motor is gone.

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2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
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mmumtaz3
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PostPosted: Fri Jan 06, 2012 12:56 am    Post subject:   Reply with quote

When you say motor mounts how many do you mean? I thought there was only one on the 3.4

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billy101
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PostPosted: Fri Jan 06, 2012 1:04 am    Post subject:   Reply with quote

I have a 3800, there are two upper dog bone mounts as well as a motor mount that mounts the motor to the subframe as well as a transmission mount that as you could guess, mounts the transmission to the subframe and keeps it all together.

Same goes for the 3400.

This is most likely what under your hood looks like
http://images03.olx.com/ui/15/.....11205.jpeg

You have two upper dog bones as well as the two lower motor and transmission mounts.

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2002 Impala LS 3.8 -121,749 miles 11/13/2011
2001 Impala LS 3.8 - 118,510 miles. 9/2/2011. RIP - 11/12/2011
2010 Malibu LTZ 3.6 - 16,014miles. 8/20/2011.
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