Last week was driving normally in "C" mode all day.
All of a sudden the car starts to shake and vibrate. When I got home i Did a quick scan and found a misfire from cylinders 7 and 8.
Left the car in the garage for 1 week. Turned it on the day before I was supposed to bring to the mechanic and car ran fine. The day of, was still ok. Mechanic scanned and confirmed a misfire on 7-8. He said let's clear the code to see if it happens again we order parts to fix. A few minutes later started to misfire again.
car is. 2019 C63S AMG. 47,000km.
Anyone had this happen? If so, was it the plugs or the coil?

Roughly same mileage as my FL when it had a misfire. Forgot which 2 cylinders but replaced the coilpacks on the 2 misfiring cylinders and all plugs.
It's a known and common issue and if I remember correctly there was a bulletin/recall for this.

Hi mate thanks for the feedback. They didn't recall it here in Auatralia.

99% it's coil pack or an injector.

If you're lucky it's bad gas.

Yes that is very likely, as you already know, there were reports of bad or leaking injectors on both E 63 S and C 63 S form. I wonder if there was even a recall.

That said, OP doesn't have the high rev to 4000 RPM when start up issue right? Maybe his injector isn't completely broken.

Last April my engine stalled and vibrate with engine light came on. Restarted after few minutes with no engine light. Next day to MB Dealership where initally found 5 and 6 misfired. Had my car, 2019C63s coupe for 2 weeks and work invoice below it was coils.
. SA said it covered under MB Extended warranty for ignition coils 15 years or 150,000 miles. Believe they also replaced the 2 spark plugs for 5 and 6.
.
* side note: a few weeks earlier had 5th year Service which includes Spark plug change completed at Dealership. Wonder if plugs were I correctly installed?

But here is the invoice what step by step was completed to ensure it was the coils.

Had a misfire on one cylinder a couple of years ago. Similar mileage as yours and also a 2019. There's an ECU update for this. They updated my ECU and for good measures swapped two of the coils to see if the misfire follows in case the ECU update didn't resolve it. After that no more misfires, so looks like the ECU update fixed it. I noticed that the oil runs at slightly lower temps since then. I also had oil level sensor issues before that. The update fixed that, too.

As said above, the coil packs are a known issue and at least here in the USA, they extended the warranty to 15 years or 150,000 miles. Warranty extensions are a regional matter, so not sure if it applies to AUS as well. They should swap the coils from cylinder 7 and 8 with two others to see if the misfires then happen in the cylinders they swapped the coils to to see if it's the coils or something else. This is standard procedure for diagnosing bad coils.

Oh the coils not the injectors. I see.

No high rev. Just starts shaking. Other shave told me it was plugs. But from reading could be a range of things. Coils, Plugs or Injectors.

Good to know.

Yup in that case, it is the coils or like another forum member mentioned, bad gas.

As a leaky injector will be accommodated by a high revving cold start since the car is compensating or otherwise overcompensating to prevent stalling.

I'm in Sydney, Australia. What would be the avenue in purchasing coils? Is it better to go Mercedes or after market also ok?

Don't buy it from Mercedes parts you'll get reamed.

To take the guesswork out, bring your car to Allen at International Autohaus in Rockdale. That's my tuner he's the most experienced with these cars, the cheapest and doesn't cheat you like other places. I've tried them all, you name it.

Been taking my car to him for years and he's even done a lot of things without charge. He'll get you the coil pack(s) much cheaper just get him to sort it out 👍

You can email him allen@internationalautohaus.com.au or give the shop a ring tomorrow 02 9519 3166

Didn't know you were also an Aussie Thanks for helping OP!

Are you from Oz too? Fark lol I always see your posts man you know quite a bit about these cars. Always got good advice.

Thought you were from Canada 😆

I am from Canada indeed : ) Glad to hear my posts are helpful, it is such a pleasure to meet people here and be here in general. I really like Aussies and I am friends with several here in Canada. Great people overall! So I was happy to hear and meet with two online, you and OP : ). Enjoy the cars in good health!

I'm also an Aussie

There are so many Aussies on the forums lately : ) https://mbworld.org/forums/new-membe...ml#post9143240

That's good to see. Most aussies these days are just posting or reading social media which is never as engaging or informative as forums.

We need more Australians (especially Mercedes owners) to get on the forums 😂

Good too see! We've weeded out a few more Aussies!

Yes thanks for the great advise guys. It's been extremely helpful.

I have good mechanic. If I have any problems though I'll go see your mate. Looks like a good guy.

I'm over in the south east of Sydney so it's pretty close.