Switch to Sport+, but no crackles?
Newbie
Joined: May 2021
Posts: 7
Likes: 0
C450
Same issue
Im following this as I’m having the same issue, I have a c450 muffler delete, pops are gone I still get bang on upshift though. They’ve come and gone before. I was thinking maybe gas but I’ve gone through a tank already. The pops sound very muffled like a valve is closed.
MBWorld God!
Joined: Dec 2019
Posts: 32,511
Likes: 6,348
After the muffler delete, was your vehicle at a dealership for servicing? Like oil change for example. Chances are they might have updated the vehicle's software.
Newbie
Joined: May 2021
Posts: 7
Likes: 0
C450
Hi!
no i haven’t had it taken in. The burbles went away once before but even with mufflers on still. I think my battery is due for change as I keep getting a warning about it but I don’t think that would be an issue? I have a dealer appointment tomorrow, hopefully they can see what it is. But it just sounds so muffled as if something is holding it back from the pops.
Newbie
Joined: May 2021
Posts: 7
Likes: 0
C450
i also just added a thing of octane booster. Maybe it’s the gas??? It happened once where once I filled up again it was back to normal but not this time 😞
MBWorld God!
Joined: Dec 2019
Posts: 32,511
Likes: 6,348
The pops and crackles are controlled by the ECU. It retards the ignition timing to achieve it. Most of us had a more muted car after certain software update which doesn't apply to you. Do you mind sharing the reason why you used octane booster?
MBWorld God!
Joined: Dec 2019
Posts: 32,511
Likes: 6,348
no i haven’t had it taken in. The burbles went away once before but even with mufflers on still. I think my battery is due for change as I keep getting a warning about it but I don’t think that would be an issue? I have a dealer appointment tomorrow, hopefully they can see what it is. But it just sounds so muffled as if something is holding it back from the pops.
Newbie
Joined: May 2021
Posts: 7
Likes: 0
C450
MBWorld God!
Joined: Dec 2019
Posts: 32,511
Likes: 6,348
Sigh : ( I am sorry that it happened. When you told me that you didn't take the vehicle in recently and you told me there was a battery malfunction, I assumed it would be the battery affecting the electronics which provides data used by the ECU to produce the crackles and pops. I wasn't sure there was any form of update to the control module. In many countries, over-the-air updates are pushed to various systems so I am not sure if that is why, although I don't know what kind of updates are pushed over-the-air because it can be a safety issue if for example a corrupted update is installed to the TCU that malfunctions (just as an example). I would assume the OTA updates only affect infotainment and other feature enhancements. EU have strict regulations when it comes to sound and emissions (emissions is the reason why the OPF filter was fitted in) although your C450 wasn't when those restrictions were taken place, besides, it says you live in the USA which is unaffected by these regulations. I am not sure why they have to purposely quiet down your exhaust. Are you able to ask for a detailed explanation from the dealership regarding to this change?
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Newbie
Joined: May 2021
Posts: 7
Likes: 0
C450
Sigh : ( I am sorry that it happened. When you told me that you didn't take the vehicle in recently and you told me there was a battery malfunction, I assumed it would be the battery affecting the electronics which provides data used by the ECU to produce the crackles and pops. I wasn't sure there was any form of update to the control module. In many countries, over-the-air updates are pushed to various systems so I am not sure if that is why, although I don't know what kind of updates are pushed over-the-air because it can be a safety issue if for example a corrupted update is installed to the TCU that malfunctions (just as an example). I would assume the OTA updates only affect infotainment and other feature enhancements. EU have strict regulations when it comes to sound and emissions (emissions is the reason why the OPF filter was fitted in) although your C450 wasn't when those restrictions were taken place, besides, it says you live in the USA which is unaffected by these regulations. I am not sure why they have to purposely quiet down your exhaust. Are you able to ask for a detailed explanation from the dealership regarding to this change?
MBWorld God!
Joined: Dec 2019
Posts: 32,511
Likes: 6,348
last time I took it to the dealer was probably 5 months ago so I don’t know why I barely got the pops removed like last week is what I don’t understand. I can ask and see what I come up with but I do live in California and I know we have pretty strict emissions standards. I think I’ll get a second opinion though because I get very low pops at under 3k rpm but higher than that I get a small quite abrupt hum when I left off that gas at 4K rpm
Newbie
Joined: May 2021
Posts: 7
Likes: 0
C450
I have another update, after the recent dealer visit I was just going to deal with it and just get a tune pretty soon. But out of nowhere today on my way to work, the pops are back and they’re just as fine as before they were gone. I’m not sure if it was really just the car trying to get use to the summer blend fuel because I did just fill up. The mystery continues... 😄
MBWorld God!
Joined: Dec 2019
Posts: 32,511
Likes: 6,348
I have another update, after the recent dealer visit I was just going to deal with it and just get a tune pretty soon. But out of nowhere today on my way to work, the pops are back and they’re just as fine as before they were gone. I’m not sure if it was really just the car trying to get use to the summer blend fuel because I did just fill up. The mystery continues... 😄
Newbie
Joined: Jan 2022
Posts: 3
Likes: 0
From: NJ
GLE53 AMG
Hi all,
I have noticed this from time to time that when I switch into Sport+ the PE does not crackle on the up shifts like it normally does. I think this may be a result of switching the drive mode while in Drive rather than in park OR switching it too quickly after the car starts up.
I should note that it still maintains the other functions of sport+ and the car’s performance/response appears to be the same, but the beautiful pops of the PE on upshifts just aren’t there. It typically will go back to normal on a restart of the engine, but figured I would ask:
anyone else seen this occasionally?
PS, yes I have ensured that made PE is on.
I have noticed this from time to time that when I switch into Sport+ the PE does not crackle on the up shifts like it normally does. I think this may be a result of switching the drive mode while in Drive rather than in park OR switching it too quickly after the car starts up.
I should note that it still maintains the other functions of sport+ and the car’s performance/response appears to be the same, but the beautiful pops of the PE on upshifts just aren’t there. It typically will go back to normal on a restart of the engine, but figured I would ask:
anyone else seen this occasionally?
PS, yes I have ensured that made PE is on.
This happened to me for sure on a few occasions. And my car is not tuned. I noticed that this happens when I've not driven the car for a couple of days. But as the OP mentioned, it goes back to normal after changing the mode a couple of times. When it happens though, it is almost as if all the other characteristics of the car in sport + but the transmission is in Comfort. Along with the lack of pops and bangs, I've noticed it also shifts slower.
I’ve been having these same issues, went to my dealer and there are telling my this is normal for this car to work like this after 20k miles, also he tried to say we are putting Low octane fuel- which I would never put in my car!
anyone know where I can get this fixed? I’m in NJ.
Junior Member
Joined: Jul 2021
Posts: 41
Likes: 5
Mercedes Benz C450 amg
I don't know if everyone is aware of this but sometimes when the pops go away is because a sensor triggered something in the ECU and it determines that it is safer to cancel all the pops. I had a turbo sensor that would trigger an ECU code a little while back and every time it did that, the pops would not come up. No check engine light so no way of knowing but using an OBDII scanner you could see it. All I had to do so clear the code and the car would be back to stock with all the pops. I'm sure this may help for a lot of you.
Newbie
Joined: Jan 2022
Posts: 3
Likes: 0
From: NJ
GLE53 AMG
I don't know if everyone is aware of this but sometimes when the pops go away is because a sensor triggered something in the ECU and it determines that it is safer to cancel all the pops. I had a turbo sensor that would trigger an ECU code a little while back and every time it did that, the pops would not come up. No check engine light so no way of knowing but using an OBDII scanner you could see it. All I had to do so clear the code and the car would be back to stock with all the pops. I'm sure this may help for a lot of you.
Junior Member
Joined: Dec 2021
Posts: 35
Likes: 1
C63 S COUPE
hey gents,
i have a c450 90k miles on it. after a month of it being in the body shop, pops and bangs were not happening when in 5-6rpm 40-50 and s+. i’ve heard the ecu maybe reset when battery unplugged but not sure, i’ve heard maybe it needs to ge r back into shape after not being driven, idk please help anyone!
i have a c450 90k miles on it. after a month of it being in the body shop, pops and bangs were not happening when in 5-6rpm 40-50 and s+. i’ve heard the ecu maybe reset when battery unplugged but not sure, i’ve heard maybe it needs to ge r back into shape after not being driven, idk please help anyone!
