Ultra Sharing

Hi all,

1 yr old 350d 4matic with 10k miles on it started working on 900 rpms when in idle and it is loud and vibrating.
Car is behaving like it is in Sport+ but actually it is in comfort, a bit humming engine noise and start is rough after i move leg from break.

After 30 mins of driving it gets back to 800 rpm in idle and then it is quiet and calm. Usually when i bought it from the day 1 it was working on 800 rpm when in idle but it changed one month ago, maybe because of cold weather?

Anyone notice the same issue, should i take it to dealer?
Thanks

Emi123

I have the same thing w213 E350d 2017

Klimfilt

Is it constant or only when you drive on a small distances ? I think it may be connected with DPF regeneration process ?

Emi123

Today normal rpm. It’s not consistent

evd22

This sounds like the normal DPF cleaning process. Shame Mercedes couldn't be bothered to put something in the manual.

Every now and then (for me maybe every month or so), this process will run to increase exhaust temperature to clean the DPF. During the process you will find 1) the engine idles at a higher rpm, and 2) lower gears are held on for longer to increase the rpm and hence temporature. If it's not fully completed when you stop the engine, it will resume a few minutes into the next startup. I usually disable stop-start during the process to keep the temperature up.

For me it takes about 10 km of driving to finish. After the process there will also be a bit of burning rubber smell around the engine bay.

Emi123

Hello I started having the rpm around 900 but when I turn off the Ac the rpm go back in normal. Can anyone help me which is the problem.

evd22

I think this is normal. I see plenty of this in summer.

AC uses power. If it's on full blast trying to cool the car on a hot day the engine has to work a bit harder to supply the power needed.

Liro

Hello there,

I had same problem with the idle RPMs stucking at 800, that was on and off very offten, some were saying that is because the bluetech cycle, bla bla. The issue was coming from the Intake Port Shutoff Actuator, looks like this part doesn't actuate on the closing side after some time, it stuck at the possition where the engine RPM output is 800 RPM.

Everyone who has this issue should change that Intake Port Shutoff Actuator and clean the lever and all moving parts that this has to do with. No one who fixed this issue hasn't come back to tell us from where was coming. I guess I am the first one haha

Thank you,

Emi123

Can you send a picture of the part? Thank you.

Liro

My car is ML350 diesel 2010 (W164). Looks like this one in the picture.