Om642 bluetech Turbo Fluttering noise
Thread Starter
Junior Member
Joined: Apr 2024
Posts: 15
Likes: 5
From: Ontario, Canada
2012 GL350
Om642 bluetech Turbo Fluttering noise
hello to all… I have posted this to GL fourms, but no response from anyone. Thought maybe it would be better to post here. i’ve come here to ask about turbo noise on the om642 engine (Gl350.) I just want to confirm if this is normal or not… When in park, and giving it some revs, it sounds like the compressor of the turbo surging when i let off the throttle after giving it some gas… but when i do it again, it sounds like a blowoff valve… just releasing the pressure into the atmosphere, and won’t do compressor surge again… I notice the compressor surge alottt when driving low speeds and building boost for like 5 seconds, then letting off. To me, I don’t like the sound… I know it’s normal for some turbo cars, as i know why it does it, and how it works… but i bothers me sometimes because…
Questions:
1. Is the compressor surge normal on these…
2. What is the reason for it to sometimes surge, or blow off
3. And do these even have Blow Off Valves?
i have attached 1 video from somewhere I had found it. No idea where the original video is from, but all credit to the original person. the other one is me. I was able to record it doing it. Of course as years pass, higher quality videos take up more space, so i wasn’t able to record much longer to upload here, but after those 2 revs it started sounding like blowoff valve…
If anyone knows about these sounds, please chime in!
Questions:
1. Is the compressor surge normal on these…
2. What is the reason for it to sometimes surge, or blow off
3. And do these even have Blow Off Valves?
i have attached 1 video from somewhere I had found it. No idea where the original video is from, but all credit to the original person. the other one is me. I was able to record it doing it. Of course as years pass, higher quality videos take up more space, so i wasn’t able to record much longer to upload here, but after those 2 revs it started sounding like blowoff valve…
If anyone knows about these sounds, please chime in!
Newbie
Joined: Jan 2026
Posts: 1
Likes: 0
2009 E350 CDI coupe
hello to all… I have posted this to GL fourms, but no response from anyone. Thought maybe it would be better to post here. i’ve come here to ask about turbo noise on the om642 engine (Gl350.) I just want to confirm if this is normal or not… When in park, and giving it some revs, it sounds like the compressor of the turbo surging when i let off the throttle after giving it some gas… but when i do it again, it sounds like a blowoff valve… just releasing the pressure into the atmosphere, and won’t do compressor surge again… I notice the compressor surge alottt when driving low speeds and building boost for like 5 seconds, then letting off. To me, I don’t like the sound… I know it’s normal for some turbo cars, as i know why it does it, and how it works… but i bothers me sometimes because…
Questions:
1. Is the compressor surge normal on these…
2. What is the reason for it to sometimes surge, or blow off
3. And do these even have Blow Off Valves?
i have attached 1 video from somewhere I had found it. No idea where the original video is from, but all credit to the original person. the other one is me. I was able to record it doing it. Of course as years pass, higher quality videos take up more space, so i wasn’t able to record much longer to upload here, but after those 2 revs it started sounding like blowoff valve…
If anyone knows about these sounds, please chime in!
Questions:
1. Is the compressor surge normal on these…
2. What is the reason for it to sometimes surge, or blow off
3. And do these even have Blow Off Valves?
i have attached 1 video from somewhere I had found it. No idea where the original video is from, but all credit to the original person. the other one is me. I was able to record it doing it. Of course as years pass, higher quality videos take up more space, so i wasn’t able to record much longer to upload here, but after those 2 revs it started sounding like blowoff valve…
If anyone knows about these sounds, please chime in!
did you manage to figure anything about this out? I’ve been told it could also be a boost / intake leak
Member
Joined: Aug 2023
Posts: 117
Likes: 17
From: Colorado
ML350 bluetec and Mini Countryman S All4
hello to all… I have posted this to GL fourms, but no response from anyone. Thought maybe it would be better to post here. i’ve come here to ask about turbo noise on the om642 engine (Gl350.) I just want to confirm if this is normal or not… When in park, and giving it some revs, it sounds like the compressor of the turbo surging when i let off the throttle after giving it some gas… but when i do it again, it sounds like a blowoff valve… just releasing the pressure into the atmosphere, and won’t do compressor surge again… I notice the compressor surge alottt when driving low speeds and building boost for like 5 seconds, then letting off. To me, I don’t like the sound… I know it’s normal for some turbo cars, as i know why it does it, and how it works… but i bothers me sometimes because…
Questions:
1. Is the compressor surge normal on these…
2. What is the reason for it to sometimes surge, or blow off
3. And do these even have Blow Off Valves?
i have attached 1 video from somewhere I had found it. No idea where the original video is from, but all credit to the original person. the other one is me. I was able to record it doing it. Of course as years pass, higher quality videos take up more space, so i wasn’t able to record much longer to upload here, but after those 2 revs it started sounding like blowoff valve…
If anyone knows about these sounds, please chime in!
Questions:
1. Is the compressor surge normal on these…
2. What is the reason for it to sometimes surge, or blow off
3. And do these even have Blow Off Valves?
i have attached 1 video from somewhere I had found it. No idea where the original video is from, but all credit to the original person. the other one is me. I was able to record it doing it. Of course as years pass, higher quality videos take up more space, so i wasn’t able to record much longer to upload here, but after those 2 revs it started sounding like blowoff valve…
If anyone knows about these sounds, please chime in!
Second... check the seals from MAF to turbo and EGR to MAF. They are both really soft rubber and get messed up from the crap that the EGR cycles back in. I found mine in poor condition when looking for that sound too before realizing it was the cover.
Thread Starter
Junior Member
Joined: Apr 2024
Posts: 15
Likes: 5
From: Ontario, Canada
2012 GL350
Hi. No, I ended up selling it. I’m sure it was not leaking boost, as that thing ripped. But i know after i sold it that the turbo was bad because it was leaking oil really bad. I woukd burn from max to min in about 900km.
