Vacuum Sucking Sound
Thread Starter
Junior Member
Joined: May 2015
Posts: 59
Likes: 10
Mercedes
Vacuum Sucking Sound
Hi, M276.952 2014 E350. This is my wife's car and I rarely drive it. However, the other day I drove it and was going to check the oil level. When I opened the hood and got into the car and quickly pumped the gas pedal I noticed a sound. It sounds like a quick sucking sound. At steady RPM's it does not make this sound, only when I quickly press the gas peddle. For all I know it is normal and I never noticed it before - but thought I would ask. I have an (not MBZ specific) OBDII laptop program and it does not show any codes and the car is running normal. The link (see below) to a video starts with the car starting, then idling, then the sound is toward the end when the gas peddle is pumped. Is this normal? Thank you.
Last edited by MPTrader; Apr 28, 2024 at 01:25 PM.
Thread Starter
Junior Member
Joined: May 2015
Posts: 59
Likes: 10
Mercedes
Also does anyone know of a great Independent MBZ shop in Scottsdale, Mesa, east valley phoenix in Arizona as I have been having trouble finding one the seems good? Thanks
Last edited by MPTrader; Apr 29, 2024 at 01:48 PM.
MBWorld Fanatic!
Joined: Sep 2018
Posts: 3,243
Likes: 932
From: New Orleans Area
2015 E400 Sedan
Sounds like Air being sucked in by engine when you open the throttle body quickly.
At idle it is almost closed with small gap to let air into engine and when you step on it it opens big and then you can hear the vacuum of the pistons pulling air into the intake system.
At idle it is almost closed with small gap to let air into engine and when you step on it it opens big and then you can hear the vacuum of the pistons pulling air into the intake system.
