RPM needle goes up and down at start
Thread Starter
Junior Member
Joined: Jan 2025
Posts: 59
Likes: 9
From: Canada
Mercedes-Benz W204, C250, year 2011, Canada.
RPM needle goes up and down at start
Hey !
The RPM needle fluctuates up and down during a cold start. I’m not sure if it’s related, but this started happening after replacing the air filter.
I wonder what it could be?
I've attached video file of how it looks...
The RPM needle fluctuates up and down during a cold start. I’m not sure if it’s related, but this started happening after replacing the air filter.
I wonder what it could be?
I've attached video file of how it looks...
Last edited by --mb--; Jan 20, 2025 at 08:03 PM.
Member
Joined: Oct 2024
Posts: 225
Likes: 29
From: Pennsylvania, US
2008 C300 4Matic
You didn’t attach the video for one. But also, if it started directly after, I bet you either installed the filters wrong or you didn’t fully seat the airbox causing a vacuum leak. Also make sure you fully seated the case the filter sits in.
Thread Starter
Junior Member
Joined: Jan 2025
Posts: 59
Likes: 9
From: Canada
Mercedes-Benz W204, C250, year 2011, Canada.
It wasn't seating fully. The issue is gone after I fixed it.
Cheers!
Member
Joined: Oct 2024
Posts: 225
Likes: 29
From: Pennsylvania, US
2008 C300 4Matic
Thread Starter
Junior Member
Joined: Jan 2025
Posts: 59
Likes: 9
From: Canada
Mercedes-Benz W204, C250, year 2011, Canada.
Yeah, it was the MAF/airbox not seating properly. Luckily, my version has a metal clip at the back of airbox that indicates if it is fully seated, but I ignored it at first.
Last edited by --mb--; Jan 21, 2025 at 03:01 PM.
