izzyz28

Hi All,

My car has had an engine vibration since I got it 50,000 miles ago. It's not drivetrain-related as it occurs even in park. I feel it most(in the seat) when the engine speed is approximately 1,500-2,000 RPM under low load conditions or in neutral. It's not the balancer as that was replaced with the 180mm pulley/balancer and the vibration stayed exactly the same. I replaced the motor and tranny mounts a while ago, and though it lessened a bit, it was still there.

My only thoughts are that it's a harmonic(which should mostly be taken care of by the balancer), or the exhaust is somehow transmitting it to the floor of the car. I've been under the car numerous times and all the rubber exhaust insulators are good and nothing is rubbing. I should also mention that I get a rattling sound around 20-25mph in cold weather when I accelerate lightly in third gear, then it goes away as soon as the car gets some heat in it. I'm pretty sure it's not the CATS, as I've even beaten on them with a heavy rubber mallet and no rattle. I've always just accepted it, but I wanted to see if anyone has experienced this. Thanks!

grantwoodtx

Search for "engine mounts"

izzyz28

As I said in the OP, "I replaced the motor and tranny mounts a while ago, and though it lessened a bit, it was still there". Mounts have been replaced.

pasamoj

Did you ever find out what the source of that vibration was? I think I have the same problem on mt 03 E500

ahmad0658

I have similar issues, exact description, you can feel the vibration inside. I have no codes.

kelwilliams08

having the same issue here, im curious if its a tranny issue ( i.e. torque converter) i think im going to have mine replaced this week and see what happens

edmond1129

Same here with the problem. Got header, 2nd cat delete and tune

izzyz28

I did! I replaced the tranny mount and the vibration was one hundred percent gone.I was honestly stunned that it worked. I believe that the first time I did the tranny and engine mounts I fastened everything down without making sure the tranny was dropped straight down onto the cross member, which caused the mounts to be slightly twisted and bind. I would recommend replacing the tranny mount only and ensure that all the bolts are in and nothing is cocked before tightening them down. FYI, I used a cheap eBay mount and it works great!

blackbenzz

It could be the driveshaft coupler or center bearing since you already replaced engine and Trans mounts

izzyz28

It certainly could be. I would slowly bring up the engine speed in neutral or park to see if its power train or drive train related to help isolate the source.

pasamoj

Thanks for your reply. I did replace engine and transmission mounts and I think there was little less vibration first couple days after replacement but its back to where it was before replacement. I don’t think anything is twisted or out of place on transmission mount. I suspect harmonic balancer on mine, we’ll see. Thank you very much.

OCKlasse

have you done the rear flex disc?

pasamoj

I don’t think it's flrx disc since I feel vibration even when car is in park. More noticeable when engine is cold.

blackbenzz

Is your seat massager on?

pasamoj

LOL

Turan

Hi.ihave S500w220. With 722.6 tranny. i have same problem with the vibration. So when the car is cold and i get the engine on. Ithas terrible harmonic vibration around 1200-1800rpm. But when the engine temprature goesupto 70 C there is no any vibration. All mounts is in good conditions.

Strigoi

Make a new thread in the correct section. This section is for the W211 AMG cars.

Here: https://mbworld.org/forums/s-class-w220-16/