95 E320, wagon 146K

All of a sudden today my wife says the car is shaking at idle at intersections. It is shaking in park or neutral noticeably, but much more so when in drive, stopped with brake applied. Don't notice much when driving. The motor seems to be idling OK, I don't seem to hear any missing or rough running. I did some searching but can't tell much. Seems to me like a motor mount but I am far from an expert and wanted some opinions.

FYI, harness is original and I've read a bit about coil packs and plugs, plug wires, MAF, OVP. No idea what the heck most of that is or where it is, but the motor seems to 'run' OK.

Thoughts of where to start (is there something obvious I could tell about either a broken motor mount or any of the above items?). I haven't had a change to dig around on it yet.

Right side motor mount (passenger side) I use to check the mounts with a 13mm socket if you cant' slide it between bottom of the mount and frame the motor mount is bad. I guess you have no shake in reverse and idle?

Thanks.

I have mild shake at idle in neutral and reverse, much more in drive. I will get under it tomorrow. I did a test with it in drive and brake held then rev the motor. The motor torques about maybe 1 inch (drivers side up,pass side down) in drive. In reverse, it seems to be less the opposite way but still raises up maybe a half inch. Hard to estimate. I don't know if that helps diagnose or not.

I also notice that my tackometer is registering around 700 RPM and does not go up at all upon revving or driving. It has done this before but usually tops at 1900 and doesn't go above even though the motor is still acccelerating but is responsive on the bottom end. It seems to be different now just sitting at idle RPMs on the taq. Not sure if this is related or another random thing.

I pulled the MAF wire off and it changes nothing if that helps diagnose. I checked the OVP fuse (15A) and it looks good assuming I got the right thing behind the battery. no problem starting or anything and seems to not be missing to my ear.

ugh!!

Sure sound like the motor mounts.

I got a couple pics of the mounts. Hopefully I can manage to link these up. Kind of hard to see, but maybe this will help confirm they are shot. I think these are probably original.


Drivers side (2 pics)





Passenger side (2 pics)





Video in next post (I hope)

time for new mounts!

Spit64, this is exactly what I have, once the car warms up (to above 85 on the temp gauge) the shake goes away, and again nothing in reverse or idle. Should I plan on doing all the mounts or does this indicate that it's one specific side or mount?

NP

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You got the torque on passenger side in forward gear so the problem should be the passenger mount. The funny thing is that you say the shake or vibrations goes away when the engine is in the working temperature around 85 you could have another problem no engine misfire or anything like that? I like to change both sides when I do the motor mounts if there is a old car.

I had the same problem...91 300E 200K. Replaced the motor mounts and shaking in drive with brakes engaged stopped. I actually had replaced the engine and when I took it out the old motor, the mounts fell apart and one disintegrated into bits.

Great to hear some reassurance on this. I haven't done anything yet (we have a spare car fortunately). I have some summer travel plans but I think I'll swap out the motor and trans mounts when I get back in town. I'll update whatever the outcome. So many of these posts seem to never have a final conclusion so hard to tell what the ultimate fixes are for so many. Thanks again!

Stick with lemfoerder for the mounts.

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