I changed the engine mounts yesterday (all three). I have a more noticeable idle rumble ONLY when in gear....when in park, or neutral it is as smooth as could be..

What should i do?

Thanks

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1993 300E, 2.8 M104 .....

The rear transmission mount should not be tightened until letting the engine run for a little bit at idle. That might solve the vibration/rumble.

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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...

What should not be tight, the cross-member?

thanks,

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1993 300E, 2.8 M104 .....

This one I believe.

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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...

What brand of mounts did you put on the car?


M

Sachs Boge front

Phoenix transmission...

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1993 300E, 2.8 M104 .....

Motor Mounts are on the Official DIY "List of Equipment that must be Factory".

If the Part does not have a Mercedes Part Number on it ,Return it.

Anything else is subject to Q.C. issues And/Or EARLY failure

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'84 300SD sold
124.128

For what reason should it be tightened only after idling for a while??

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010

Did you take a test drive after doing only the engine mounts? ie, so that you could determine if it's the engine mounts or transmission mount.

I did the engine mounts last week, and not the transmission mount (plan to do it this week or next) and the idle was 100 times better in gear. Basically smoother everywhere, except MAYBE the top end. 5000-6000rpm
And I am not certain if it is rougher in the top end, or it's a case the the bottom and mid is so much smoother that the top end in relation feels rougher

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010