ML350 Cold Start Rattle Noise
Thread Starter
Junior Member
Joined: Oct 2021
Posts: 68
Likes: 9
From: Kazakhstan
ML350 - 2007 164.186
ML350 Cold Start Rattle Noise
Since I bought the vehicle (about 2 years ago), the engine has been making a rattle sound when starting cold. Since there were many similar complaints on the internet but not the same as mine, I did not pay much attention to it and considered it unimportant that this sound occurred only once a day. Also, since the car's catalysts were also canceled, I thought this was the reason. I had a new catalyst installed in the car last week. I have been driving the vehicle for the last 300-400 km without any engine failure. but this sound still continues.
In this 2 years;
I replaced the Bosch MAF sensor.
I replaced the Bosch MAP sensor, there is no difference.
Also, unlike the videos I see on the internet, in my vehicle the RPM suddenly drops and rises again, and there is a rattle sound at this time. In idle, the engine is very quiet, there is no chain noise etc.
Do you have any comments about this issue?
2007 - ML350 4 Matic (164.186)
In this 2 years;
I replaced the Bosch MAF sensor.
I replaced the Bosch MAP sensor, there is no difference.
Also, unlike the videos I see on the internet, in my vehicle the RPM suddenly drops and rises again, and there is a rattle sound at this time. In idle, the engine is very quiet, there is no chain noise etc.
Do you have any comments about this issue?
2007 - ML350 4 Matic (164.186)
Thread Starter
Junior Member
Joined: Oct 2021
Posts: 68
Likes: 9
From: Kazakhstan
ML350 - 2007 164.186
When I looked into this issue, I found a video, in the explanations it was written that this sound was caused by the o-ring of a pipe inside the oil pan.
When I searched for the O-ring number A0149973148 on the internet, I saw that it was called "golden ring", especially on Russian sites, and this solved the problem. (The reason why it is called the "golden ring" is because this noise requires huge expenses to change chains etc., but in the end, this 5$ o-ring solves the problem)
Now, at the next oil change, I will change the oil with this part after approximately 4.000 km.
Then I will update again.
references;
https://www.drive2.ru/l/559400181204779168/
When I searched for the O-ring number A0149973148 on the internet, I saw that it was called "golden ring", especially on Russian sites, and this solved the problem. (The reason why it is called the "golden ring" is because this noise requires huge expenses to change chains etc., but in the end, this 5$ o-ring solves the problem)
Now, at the next oil change, I will change the oil with this part after approximately 4.000 km.
Then I will update again.
references;
https://www.drive2.ru/l/559400181204779168/
