Violent idling with new engine mounts

[Bad_Mechanic]

Hello, I have a 2000 Mazda 626 LX, 2.0L 4 cyl, automatic, 145k miles, that is idling very badly. This car has a total of 5 mounts: rights side, left side above transmission, one below the transmission, one up against the firewall, and one on the radiator support. I had everyone except the rear one 2 months ago. Idle was fine but I was told (and they were right) that the rear mount was broken. So I had it replaced. The part number ordered was DEA A6405. Well after the rear mount was installed 2 days ago the car has been idling very violently. You can feel it in the seat and steering wheel. Also, you can see the whole front bumper and the right side front quarter panel vibrate. With the hood open the engine is can be seen vibrating a lot(!!).

I took it to another mechanic today and he observed a few things as did I.
(1) The small transmission mount that goes underneath is lopsided, as its’ profile looks something like this __ (imagine a line parallel to the bottom one).
(2) The through bolt of the front mount is no perfectly centered, as the weight of the engine is making the bushing touch the top back (towards the rear of the car) wall of the mount.
(3) The rear mount that was installed does not fit within the bracket lateral-wise. I l_1I The I’s are the bracket ends and the 1’s are the ends of the mount. All the holes and bolts line up though, there’s just a space at the right end.
(4) Right-front quarter panel vibrates much more than the front-left does.
(5) When the mechanic loosened the front mount, the bolt changed position, so he tightened the nuts and bolts that held the mount in a way that centered the bushing in the mount. It seems to have returned to its original position though.

What is wrong? What should I do?

I know I’m not suppose to guide the reader to a solution but I just felt I needed to illustrate what has been done to the car.

Topic

[Bad_Mechanic]

I didn’t pay for the rear mount to be installed, the mechanic is a regular customer where I work, he did it for free ans would do the job again but as it was said in previous posts he believes the mount is perfect and won’t cinsider the work he did to be the problem. So i won’t go back to him.

[Daniel]

I’m starting to think that this guy may have damaged something while changing that mount.

[Bad_Mechanic]

I’m going to start testing for intake vacuum leaks. Is carb cleaner safe on rubber? I was going to use the spray to test a leak by listening for engine rev.

[Daniel]

Carb cleaner is fine on rubber. You will not hear a rev you will hear the idle drop

[Author]

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