C63s misfiring on bank 1
Thread Starter
Newbie
Joined: Dec 2023
Posts: 1
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2018 c63s
C63s misfiring on bank 1
C63s misfiring on cylinders 1-4, mods are downpipes and tune, already swapped coils and plugs between banks with no difference.
Only codes are the misfiring for all of bank 1, cold start seems fine for a few seconds then idle drops down and cel flashing and you can feel the misfiring and roughness on my scanner showing only for that bank. When I rev it, the motor seems to run a bit smoother but roughness doesn’t go away. Checked compression and all the numbers were good and didn’t vary much between cylinders, before I waste time swapping injectors between banks anyone have any other ideas what could be causing it?
Logging fuel pressure match up between banks and are what spec is for idle. Not sure what else besides injectors, but find it hard to believe all 4 would go out at the same time.
Only codes are the misfiring for all of bank 1, cold start seems fine for a few seconds then idle drops down and cel flashing and you can feel the misfiring and roughness on my scanner showing only for that bank. When I rev it, the motor seems to run a bit smoother but roughness doesn’t go away. Checked compression and all the numbers were good and didn’t vary much between cylinders, before I waste time swapping injectors between banks anyone have any other ideas what could be causing it?
Logging fuel pressure match up between banks and are what spec is for idle. Not sure what else besides injectors, but find it hard to believe all 4 would go out at the same time.
Senior Member
Joined: Dec 2017
Posts: 308
Likes: 71
From: Charlotte, NC
17 C63S Coupe PTG1000
C63s misfiring on cylinders 1-4, mods are downpipes and tune, already swapped coils and plugs between banks with no difference.
Only codes are the misfiring for all of bank 1, cold start seems fine for a few seconds then idle drops down and cel flashing and you can feel the misfiring and roughness on my scanner showing only for that bank. When I rev it, the motor seems to run a bit smoother but roughness doesn’t go away. Checked compression and all the numbers were good and didn’t vary much between cylinders, before I waste time swapping injectors between banks anyone have any other ideas what could be causing it?
Logging fuel pressure match up between banks and are what spec is for idle. Not sure what else besides injectors, but find it hard to believe all 4 would go out at the same time.
Only codes are the misfiring for all of bank 1, cold start seems fine for a few seconds then idle drops down and cel flashing and you can feel the misfiring and roughness on my scanner showing only for that bank. When I rev it, the motor seems to run a bit smoother but roughness doesn’t go away. Checked compression and all the numbers were good and didn’t vary much between cylinders, before I waste time swapping injectors between banks anyone have any other ideas what could be causing it?
Logging fuel pressure match up between banks and are what spec is for idle. Not sure what else besides injectors, but find it hard to believe all 4 would go out at the same time.
Junior Member
Joined: Apr 2018
Posts: 43
Likes: 6
From: Southern California
C63 Amg coupe 2018
C63s misfiring on cylinders 1-4, mods are downpipes and tune, already swapped coils and plugs between banks with no difference.
Only codes are the misfiring for all of bank 1, cold start seems fine for a few seconds then idle drops down and cel flashing and you can feel the misfiring and roughness on my scanner showing only for that bank. When I rev it, the motor seems to run a bit smoother but roughness doesn’t go away. Checked compression and all the numbers were good and didn’t vary much between cylinders, before I waste time swapping injectors between banks anyone have any other ideas what could be causing it?
Logging fuel pressure match up between banks and are what spec is for idle. Not sure what else besides injectors, but find it hard to believe all 4 would go out at the same time.
Only codes are the misfiring for all of bank 1, cold start seems fine for a few seconds then idle drops down and cel flashing and you can feel the misfiring and roughness on my scanner showing only for that bank. When I rev it, the motor seems to run a bit smoother but roughness doesn’t go away. Checked compression and all the numbers were good and didn’t vary much between cylinders, before I waste time swapping injectors between banks anyone have any other ideas what could be causing it?
Logging fuel pressure match up between banks and are what spec is for idle. Not sure what else besides injectors, but find it hard to believe all 4 would go out at the same time.
If your at 5 years over 30k miles be proactive unlike I was. Change the above items your def not alone in these issues.
MBWorld Fanatic!
Joined: Feb 2017
Posts: 2,297
Likes: 1,205
From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
Do they know the car was tuned? Hard to imagine if they discover that, that they will still be willing to cover the warranty. Might want to keep that eBay claim open until you have the car back in your hands. This is not to discourage your enthusiasm but to convey that it’s not always strait forward. It would also be interesting to hear what caused the issue…vs what gets replaced.
Member
Joined: Jan 2022
Posts: 159
Likes: 42
From: San Diego,CA
2021 AMG C63S, 2008 C300
Take a closer look at the MAP sensor on that specific bank that’s missing. The sensor could be skewed or reading incorrectly causing a false input. Mine occasionally will get skewed and have 4 cylinders drop. And a quick engine off reset fixes the glitch. It eventually went away on its own before I had a chance to repairing it. It was diagnosed with data logs during the event. It’s the map sensor that’s on the intercooler.
