FirstMBAMG

munis

I had mine for 1.5 years now, and it has never missed a single upshift bang no matter when I put in Sports+ (either during drive or in neutral/parking) GIVEN, the engine and trans is in operating temperature (70C for engine, 50C for transmission), you can check this by using the AMG menu in the instrument cluster.

Do note, upshift bangs and crackles on liftoff are two different kind of sounds. My car always makes the upshift bang no matter what, but the liftoff/ downshift crackles disappears if the engine gets too hot (110C). I think at high temperature the engine stops dumping extra gas for crackles as a safety feature. Once it drops back to 105C, it resumes normal service (liftoff/ downshift crackes) as usual, haha.

The problem you are talking about (no upshift bang on upshifts), I have heard about this happening from tuned cars. They occasionally miss a up shift bang during the first and second gear. If your car is not tuned, I do not know why it is happening. Something might be wrong if this was not happening before.

Bond 985

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.

Mr. J

It won't let you get rowdy until the car is up to optimal operating temp.

munis

That is 100 percent not normal. Something is not right. We have a group of 20 C43 owners with PE and I have never heard of this. Expect for the ones that are tuned.

FirstMBAMG

Hm all great information, thank you for sharing. Although I don’t foresee anything, I will take my car to a shop and see if the ECU is acting normally. Thank you guys for the comments.

JKane

Any update on this? Im having a similar issue. Im getting WAY more quiet pops and sometimes none when letting off throttle and bangs on upshift are like 50% as loud.

jacob Mcdowell

Having this exact same issue currently, has anyone ever figured this out or gotten to the bottom of it. My car is completely stock no tuning. Out of nowhere I lose my crackles and pops and when they do come back they're like 50% weaker or not as loud as they used to be.. if I really floor it I can make them return but they still seem muffled.. I have a 2016 c450 no PE.. confused as to why the pops and crackles wouldnt be normal anymore and I've noticed early shifting around 24rpm when the car was shifting at 28-3k rpm when in sports +regularly when I first got it. Any help?? I want her back to her crackling popping self!!

hlieberg

I've had the same issue a couple of times in the 2 years I've had my C43 with PE. Since you have the same issues on your C450 without PE, my guess is that this is related to the software that controls these "things" depending on which mode you have it in.

Steelguin

I have the PE and for whatever reason it stopped making all those bangs etc and I love it.

st33zy

yup, this has happened to me too as well. 2018 c43 no tune with PE. turning the car off and on usually solves it.

jacob Mcdowell

Does anything seem to fix it for you or does it just come and go? would be pretty odd to me if the car wasnt consistently performing the same when in sport + .. kind of sad that the car isnt sou ding as aggressive as it did when I first got it. I mainly got it sold on the sound of the car.. major loss not hearing that roaring with the crackles n pops regularly. And when they do occur they're much weaker sadly

ANTesp2370

I’m having the same issue with my c450. Does anyone have a solution to the problem?

Trekt43

Is yours all the time or only occasionally like OP?

I have had this issue mainly when switching from ECO to Sport+ after a long drive on the highway. the quickest way for me to fix it is to turn the car off and let it chill for 10 minutes or so until the ecu goes to sleep.

Has your car been updated recently? An update at some point reportedly reduced the volume and frequency of pops. I got my car after this update so I can't confirm this.

Also, its possible the car reduces the pops if it finds exhaust components getting too hot. My buddies M3 turns off the burbles and anti-lag pops when the exhaust/downpipes get too hot. Its not a c43 but I could see something similar happening

Eger

Just picked up my C43 with a couple thousand miles on it (demo) - No crackling sound whatsoever. I was rather disappointed

W205C43PFL

Over the years, MB did update the ecu a couple of times, it was definitely louder when the car was first out of the factory. Maybe that is why you don't get the sound? Keep driving it though, as you drive it, it might start making the sounds again.

gg_monogram

I am the other way, sometimes mine starts with PE on while I'm on Default (Comfort).

Ramboalpha

Having the same issue here for a 2016 C450 no PE. Car currently has a little over 100,000km and day by day the pops started to sound less and less and now it doesn't pop at all in S+. About 2 months ago, the turn off turn back on method worked and now that doesn't work. There were times where i would be driving in S+ and the pops are beautiful and loud and then 10 minutes later, still in S+ they would disappear.

The performance still seems to be present just no sound to match. I did get a CEL randomly last week which went away the day after, maybe there could be a related code if i ran a OBD? i don't know. When i start the car in S+ it pops for the initial start up but when driving it sounds similar to others with the same problem, muffled like the valves are stuck closed or something.

mcschan86

For me, it doesn't pop if I don't warm up the car enough. I try to warm it up to operating temperature and then switch over to S+; the pops are there at that time.
But I sometimes still get pops when I switch back to C and turn the PE OFF after driving around for 20-30 mins at S+. Not sure if it's a bad thing but sometimes it just doesn't shut up.

Eger

So are 2019’s supposed to pop at all? Just want to make sure before I call the stealership about my new car.

TModelle

Not really. Not as much as the pre facelift.

Eger

I guess I’ll pass on mentioning. I get a nice sound on upshifts and downshifts. No pop or crackle. My C450 would pop and crackle a couple times shot some fire out the back twice but think the car was dumping too much gas.

batman719

My 2019 pops and crackles. It stops when it gets really hot, but there's plenty of drives where I get pops and crackles on every downshift. If yours isn't doing it at all, something is wrong.

Ramboalpha

So.....ran a OBD scan and got code P0430 for the Cat so that’s fun...to the shop I go! Hopefully this is fixes the issue.

Adam Golba

Hello friend ! I have the same issue.....did you finnaly found out what was the problem ? Please respond thank you!