Vibration at idle whether in drive or neutral, CLK320

[liftmys10]

I currently have 125k miles on my CLK 320 and I've always had this vibration at idle whether im in drive or neutral since the time I purchased the car (with 95k miles in August 2009). The vibration goes away as soon as you start rolling, and the engine seems very strong and pulls all the way to redline with no other problems. The vibrations seems more noticeable when the engine has fully warmed up. I have gotten 34 MPG on the highway not too long ago.

The first owner had all 12 spark plugs changed as well as the fuel filter @ 87,400 miles.

So far, I have changed the motor mounts, transmission mount, and spark plug wire set, and flushed out the ATF fluid @ 95,730 miles which they all helped out alot with the vibration, but it's slightly there still.

Only thing left are the coils.... Any suggestions before I change out the coils?

[jaycarby]

I have the same issue , car drive great on acceleration and all but idles a lil rough and the only thing i haven't done is changing the engine mounts . Whats a good price an indie can so it for ??

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[liftmys10]

Originally Posted by jaycarby

I have the same issue , car drive great on acceleration and all but idles a lil rough and the only thing i haven't done is changing the engine mounts . Whats a good price an indie can so it for ??

Sent from my LG-P990hN using AutoGuide.Com Free App

I was born in Laval, must be a Montreal issue.

[keyhole]

Originally Posted by liftmys10

I Any suggestions before I change out the coils?

Yes - have your codes read.

[bobbyjo9]

There is another thread going with similar complaint. Many instances a cheaper inferior new mount was the cause... namely the trans mount. Did you use OEM quality mounts?

[liftmys10]

Originally Posted by keyhole

Yes - have your codes read.

I don't have a CEL, is it possible that I might still have codes without triggering a CEL?

[keyhole]

I'm not absolutely sure of that.... I know that the codes get stored for reading later. Someone else will know more.

[Dan__B]

Originally Posted by liftmys10

I don't have a CEL, is it possible that I might still have codes without triggering a CEL?

Yes. You can have codes without triggering a CEL.

A dirty Mass Airflow Meter can also trigger the symptoms you describe. Pick up some MAF cleaner at the parts store (CRC makes some) and use it according to the instructions. It may help your issue.

[liftmys10]

Originally Posted by bobbyjo9

There is another thread going with similar complaint. Many instances a cheaper inferior new mount was the cause... namely the trans mount. Did you use OEM quality mounts?

Im not sure if it's OEM, but the motor and transmission mounts are made by this company called FEQ (First Equipment Quality) bought them from Parts Geek online. I hope these are not the cheaper inferior mounts?

Originally Posted by Dan__B

Yes. You can have codes without triggering a CEL.

A dirty Mass Airflow Meter can also trigger the symptoms you describe. Pick up some MAF cleaner at the parts store (CRC makes some) and use it according to the instructions. It may help your issue.

You're right, I read the codes and got P0150 and P0130 (both are for the O2 sensor) Wonder if that can cause the rough idle? Worth a shot!
Im cleaning my MAF as we speak with CRC MAF cleaner. Thanks.

[liftmys10]

Well I cleaned the MAF but no luck. I also changed out the motor oil today.
I forgot to mention in my first post that the vibration is more noticeable when the engine has fully warmed up.