Johnny915

Hi guys, what's up. I own a C450 AMG. It has been working great, but recently I found that my car's backfire has disappeared. In S+ or any mode, I no longer hear the explosion of the exhaust pipe.

The entire car was working properly and there were no fault lights. I can't find out why... anyone can help?

Spurts

one day I returned to the car and the screen wouldn’t switch on. When I started driving the backfires had stopped. I called MB tried a few things and they didn’t work. Screen came back in next day and the backfires followed about a week later.

I should ask - did you refuel recently? MB told me that the car can be affected if you don’t tighten the fuel cap properly.

Dieseldan9

iTrader: (1)

Disconnect Ecu to reset the learning feature?

Johnny915

Yes, I did refuel recently, I will check the following, thank you.

Skim450

interesting... this post gives me anxiety..... i hope to never lose the pops and bangs. would probably sell the car if that happened. haha.

Johnny915

haha

gcurnew

Well i"m interested in what stopped the backfires...but for a different reason. I am one of the folks in the minority who really doesn't like the pops and crackles from my 2019 C43 with PE . If there's a way to eliminate them without affecting drivability or performance, and not throw any codes, I''d be a happy camper. Subscribed to this thread.

Johnny915

Okay... A little update here, the backfire just came back this evening(yeh!!!).

I still don't know what caused the backfire disappearance, but I am boldly guessing that there is a problem with gasoline. I have always been a big fan of SHELL, but In the past few weeks, I tried the NO. 91 gasoline FROM 76. It doesn't take long, maybe only a few days later, the backfire sound disappeared and the car accelerated to become negative.

I didn't say that the gas from 76 is bad for our AMG model, butttt I won't try any no.91 gasoline from 76. Never!

Before the backfire came back tonight, I have completed three refuelings, they all come from the shell. If your backfire sound disappeared, try replacing the gasoline. If it doesn't work, pls go to the dealer (I just canceled the plan for tomorrow... backfire is really back on time).

Skim450

where are you located? i am in SoCal and have only used 76 on all my cars for over 10 years with no issues.... using it in the AMG and getting all the pops and bangs.

hlieberg

What kind of gasoline do you refuel at Shell? 91 or 93?

Skim450

i dont know about other states, but in California we only get 91 as the highest octane out of the pump.
i have run 91 on my turbo cars and never had an issue, not even with the 450.

hlieberg

Ok, since it's the same octane, it's ok. Could be the quality of the fuel itself then. The C43 is originally made for 98 octane (RON) which is equal to 93 octane in the US (and Canada, I suppose). But I guess the engine is adjusted/adapted to the fuel available where it was sold.

jonathan358

Where did you find the info that states the stock C43 is mapped for 93 AKI?

hlieberg

The dealership and inside the fuel cap.

INSANE GREEK

Erase the bomb with the old scanner tool
U will get the pops back if it has codes stored. It won't do the pops

INSANE GREEK

Erase the obd with the old scanner tool
U will get the pops back if it has codes stored. It won't do the pops

Kevin Diao

Yeah I too own a c450 our pops and crackles come and goes, this is very odd. Sometimes it’s extremely loud and there r times that it doesn’t make a single pop at all. I still couldn’t figure out why tho🥲

hyperion667

Have you lads considered an actual AMG? That may solve the problem.

////AMG_C43

Nothing beats a good cup of coffee and an early morning douche.

hyperion667

OOOH good one laddy Guess the answer is no lol.

Howyalivin

Love people that think they know more than either the history of a company or the company themselves. If you bought your car and don't know the history of it, but feel the need to troll another form..... That says it all. Your girlfriends must be underwhelmed.

hyperion667

Oh man! Welcome to the forums mate, good luck on your search for a MB You must be one of those hate the player kind of lads lol. The truth can be jarring though I admit.

hyperion667

Research Shows: How men can appear MORE attractive to the ladies : theCHIVE

////AMG_C43

I really think Hyperion667 is out of our league.

Based on his baller ride, along with his history of 26,259 posts, I think we are out-gunned.

Think of an angry old man whose real life is sitting in front of his 15 year old Dell desktop while getting-off by trolling folks on the internet.

That said, I will concede that his CLS is probably a real a home run with the babes; at least when he rolls up at the local assisted living facility.

hyperion667

You're spot on young fella. My assisted living facility is a really great place. I don't hate on you for being young; we've all been there Keep on shooting your tiny little arrows if it makes you feel better, and enjoy your watered down, badged AMG too LOL! And my computer is actually an HP not a dell, but thanx for trying