Collapsed Motor Mount/Vibration
 

Just got back from the dealer. Brought my '04 AT in for excessive vibration at idle. They said the right side motor mount was "collapsed" and needs to be replaced. However, there is 1-2 month backorder on the part because it seems that many others are having the same issue. I read abouth a few others who had this problem, but it must be many more to have the part backordered nationally. The part has to be freighted from Japan.

That mount is located very close to part of the exhaust system. The extreme heat seems to be causing the part fail.

I had the same problem, had it replaced 5-6 months ago now it needs to be replaced agian. I haven't gone to the dealer yet, but my car idles like a 1978 pinto running on 1 cylinder!! Did they offer you a rental for the wait of the part?

A rental for 1-2 months? Of course not. The vibration isn't too bad. Just a little annoying. I imagine it is going to get worse though.

Just pull it, cut it open and drain the oil then fill it with 80-shore high-durometer two-part urethane and re-install.
It will never fail again.

It definitely will get worse, I can feel mine through the seat!!! It gets even worse when the A/C is on

There is a TSB for it. They will replace it with an improved mount, the new one has a heat shield. They replaced both of mine even though only one gets excessive heat.

Motor Mounts
 

I have a 2004 rx8 motor mounts on back-order....is this a recall I haven't been notified...Been over a Month...still waiting

Yup me too. Its just one more reason to blast my Kenwood system ;)

If there's a TSB, I'm not seeing it on our TSB link in the Issues and Problems section. Isn't that a comprehensive list?

How would you go about injecting the urethane? Just curious.

You don't inject really, you pour.
Take the old motor mount and cut the bottom cap off (it looks like a rubber dart board). When you do so, a few ounces of mineral oil will come out.
Dry it up and rinse with a solvent. Then mix up some flexible urethane with an 80 shore rating (go to http://www.mcmaster.com/ and search for product 8644K11). Set the motor mount on its top on a level surface and fill the cavity with the above mentioned urethane.
Let it sit for two days and then re-install it.
It will never collapse again. However, there will be a slight vibration penalty. If your car has a particularly rough idle, I wouldn't recommend this. But if it is smooth like mine, then there is no noticible difference.

There is not a TSB on this yet, but it is a "known" issue IIRC. My car is currently at the dealer for new mounts as well. Noticed the increase at about 21k.
04 6spd.

Do the new cars have the improved mounts straight from the factory?

I've got the same prob on my 05' automatic...I was looking for info on this! So glad I found this thread! It's going in for this as well as other probs next week...

Yes.

i just got my rx8 fixed for this, they took a week to figure out what was wrong, made me take my car back for a week while the parts came in, then my car went back in for a week in order to put them on, much better now.

Man I'm glad I'm not alone. My 04 AT started doing crazy vibrations 2000 miles ago too when idling in Drive and Reverse. On my last visit to the dealership about a month ago the techies noted the problem but didn't know what was causing it, all they did was submit the info to Mazda and said they'd get back to me. Haven't heard from them since. I'd love to see an official TSB to show them.

A week!
 

You got them in only a week? :banghead: They told me 1 to 2 months to get the mounts since they are on backorder and have to be shipped from the factory in Japan. I bet they never call.

out of curiousity, my car is running a little rough, how do I know if the idle is just set too low or if its the engine mount?
The minute I start driving the vibration stops. what is the sitting still idle supposed to be at? I have a 2004 AT. I'm running at just a little under 1000RPM when still.
And if I need to adjust the idle where do I find the idle adjuster?
thanks
dee

"The idling speed cannot be adjusted", believe it or not. (See the attached page from the shop manual.) Your idle speed is probably OK according to what you say. A minor amount of vibration at idle is normal. If it is extreme, you should have it checked out.

I just got my '04 back after the collapsed mount problem was fixed. It is now a recall item and the service manager knew all about it. He also knew about the problems with a national back order on the part. He told me it was the part for the automatics, they had the one for the manual transmission rx's in stock. They replaced the part, cleaned my injectors and did a couple of little things on the same day.

Purrs like a kitten...

W.

DeeDeej:

Those are exactly the symptoms I had in my car. It was the mount.

OMG, I've been fighting with this vibration for almost 10k miles!!! I never knew what was wrong! I always read for TSBs, but I guess this problem isn't important enough yet. Thanks guys for posting this! Back to the dealer I go!

Took 7 weeks to get mine. Replaced both sides plus got a new 9V starter and battery upgrade.
As good as new....well, at least until something else goes el-wacko