When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Originally Posted by Barbalatte
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.
If get stuck and really need a coil pack I can give you one I have a spare. Used it for 1500km but It's the newer one so shouldn't bust on you you can have it for free.
Just send me a pm here or on the instagram if you use that.
If get stuck and really need a coil pack I can give you one I have a spare. Used it for 1500km but It's the newer one so shouldn't bust on you you can have it for free.
Just send me a pm here or on the instagram if you use that.
Jimmy you are too kind, thanks for helping a fella forum member out!
I had the CEL and limpp mode from misfire also, but only at high RPM. I was on track and this happened everytime on the 3rd or 4th lap of a session in basiclly the same spot on the track. I'd pull off and clear the code but it would come right back. I've since changed all of the spark plugs (they needed it at only 30,000 miles) and 2 of the coil packs myself. The issue hasn't returned but I also have not (and won't) be going back on track. I only did the track days because I had 2 prepaid sessions left from when I had my C7Z06, which I sold.
I will say that the pug and coil swap was the hardest I've ever had to do before on my 2019 AMG C63S! So little room and so much in the way. And getting toe coil packs off was a real *****, even with a special tool. I don't look forward to another plug swap, that's for sure!
I also swapped out the rear diff fluid and transmission fluid, along with an oil change, air filters changed (engine & cabin air) as well as front brake pads/rotors and a brake fluid flush.
Next (when needed) will be switching to an all season tire to reduce the road noise and harshness of the ride some. After the Z06 I don't need the C63S's ride to be tight & stiff any longer. lol
I had the CEL and limpp mode from misfire also, but only at high RPM. I was on track and this happened everytime on the 3rd or 4th lap of a session in basiclly the same spot on the track. I'd pull off and clear the code but it would come right back. I've since changed all of the spark plugs (they needed it at only 30,000 miles) and 2 of the coil packs myself. The issue hasn't returned but I also have not (and won't) be going back on track. I only did the track days because I had 2 prepaid sessions left from when I had my C7Z06, which I sold.
I will say that the pug and coil swap was the hardest I've ever had to do before on my 2019 AMG C63S! So little room and so much in the way. And getting toe coil packs off was a real *****, even with a special tool. I don't look forward to another plug swap, that's for sure!
I also swapped out the rear diff fluid and transmission fluid, along with an oil change, air filters changed (engine & cabin air) as well as front brake pads/rotors and a brake fluid flush.
Next (when needed) will be switching to an all season tire to reduce the road noise and harshness of the ride some. After the Z06 I don't need the C63S's ride to be tight & stiff any longer. lol
Ron
MB will warranty Ingintion Coils for 15 year/150,000 miles regardless of warranty. My 2019 C63s coupe had misfires on 5 and 6 and Dealership covered this under this policy. They had my car about 3 weeks.
Also had Service B recently performed and note there are 2 separate filters:
1. Fine particle filter.
2. Dust filter.
* see part numbers below.
MB will warranty Ingintion Coils for 15 year/150,000 miles regardless of warranty. My 2019 C63s coupe had misfires on 5 and 6 and Dealership covered this under this policy. They had my car about 3 weeks.
Also had Service B recently performed and note there are 2 separate filters:
1. Fine particle filter.
2. Dust filter.
* see part numbers below.
Yup. I replaced both types of filters.
3 weeks, huh? That's exactly why I did it myself on my dime...I didn't want them to have my car for 3 weeks! I got the colis myself online in 3 days for like $150 or so total and fixed it on the day they arrived. Zero down time.
Guys today my mechanic performed a Coil change on 7-8 as well as spark plug change in all 8 cylinders . After 20km it started to misfire again. I'm at a loss. What else could it be??
Yup. I replaced both types of filters.
3 weeks, huh? That's exactly why I did it myself on my dime...I didn't want them to have my car for 3 weeks! I got the colis myself online in 3 days for like $150 or so total and fixed it on the day they arrived. Zero down time.
Ron
Originally Posted by Barbalatte
Guys today my mechanic performed a Coil change on 7-8 as well as spark plug change in all 8 cylinders . After 20km it started to misfire again. I'm at a loss. What else could it be??
As I posted here on April 8. I had cylinder 5 & 6 misfired Both Ignition coils and spark plugs were replaced.
I noticed in para1 below that the MB tech. detached the left rail from fuel injectors of left cylinder bank. Removed all fuel injectors of the left cylinder bank. Cleaned fuel
connections on fuel injectors.
See photo below on what Parts were used to correct the misfires.
.
Don"t know if this information will help but wanted to post it in case it does.
Yup. I replaced both types of filters.
3 weeks, huh? That's exactly why I did it myself on my dime...I didn't want them to have my car for 3 weeks! I got the colis myself online in 3 days for like $150 or so total and fixed it on the day they arrived. Zero down time.
Ron
Originally Posted by Barbalatte
Guys today my mechanic performed a Coil change on 7-8 as well as spark plug change in all 8 cylinders . After 20km it started to misfire again. I'm at a loss. What else could it be??
As I posted here on April 8. I had cylinder 5 & 6 misfired Both Ignition coils and spark plugs were replaced.
I also noticed in para1 below that the MB tech. detached the left rail from fuel injectors of left cylinder bank. Removed all fuel injectors of the left cylinder bank. Cleaned fuel
connections on fuel injectors.
See photo below on what Parts were used to correct the misfires.
.
Don"t know if this information will help but wanted to post it in case it does.
Just scanned it and the misfire is on a different cylinder. No. 5 this time! I'm at a loss.
Did they replace the coils for cylinder 7 and 8, or did they swap them with two coils from two other cylinders, specifically No 5? As I explained earlier, the coils are typically swapped first to see if the misfire travels along with the coils in order to isolate the misfire to a bad coil and then replace the bad coil. If they replaced the coils for cylinder 7 and 8, then the cylinder 5 coil might have just started to fail as well coincidentally now that 7 and 8 are not misfiring anymore. If they are replacing bad coils, they should replace all 8, because your engine likely has more bad coils.
The other point is what was posted above about cleaning the fuel injectors. Problem is that once you have misfires, you have incomplete combustion in the affected cylinders and gunk could end up where you don't want it causing further issues. Before you bring it back in, you can try an Italian tune up to blow the engine through and hopefully get any deposits dislodged and blown out. If you don't know what an Italian tune up is, it means doing a bunch of read lines and put some high loads on the engine. Go WOT and drive it like you stole it. Just out of curiosity, how do you normally drive this thing? Are you giving it a proper workout regularly, or are you somebody who is driving their AMG mostly in slow commuter traffic? If I remember correctly, didn't you buy this car from an elderly lady? As I like to say, a redline a day keeps the mechanic away.
Lastly, did they update the ECU? As I told you in my earlier post, there's an ECU update for the 2019 models related to misfires.
Last edited by superswiss; Apr 27, 2025 at 06:43 PM.
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Originally Posted by superswiss
Did they replace the coils for cylinder 7 and 8, or did they swap them with two coils from two other cylinders, specifically No 5? As I explained earlier, the coils are typically swapped first to see if the misfire travels along with the coils in order to isolate the misfire to a bad coil and then replace the bad coil. If they replaced the coils for cylinder 7 and 8, then the cylinder 5 coil might have just started to fail as well coincidentally now that 7 and 8 are not misfiring anymore. If they are replacing bad coils, they should replace all 8, because your engine likely has more bad coils.
The other point is what was posted above about cleaning the fuel injectors. Problem is that once you have misfires, you have incomplete combustion in the affected cylinders and gunk could end up where you don't want it causing further issues. Before you bring it back in, you can try an Italian tune up to blow the engine through and hopefully get any deposits dislodged and blown out. If you don't know what an Italian tune up is, it means doing a bunch of read lines and put some high loads on the engine. Go WOT and drive it like you stole it. Just out of curiosity, how do you normally drive this thing? Are you giving it a proper workout regularly, or are you somebody who is driving their AMG mostly in slow commuter traffic? If I remember correctly, didn't you buy this car from an elderly lady? As I like to say, a redline a day keeps the mechanic away.
Lastly, did they update the ECU? As I told you in my earlier post, there's an ECU update for the 2019 models related to misfires.
This is good advice Swiss I totally forgot there was a software update for 2019 models for misfires which I should have mentioned to OP.
Also, OP's car was taken to an indy and had all plugs changed too. Could spark plug indexing play a role in causing a different cylinder to misfire? Or would that be a fault registers a misfire later on?
OP is a really good guy I'm hoping he can get his car going again.
Last edited by Jimmy_c63s; Apr 27, 2025 at 08:44 PM.
This is good advice Swiss I totally forgot there was a software update for 2019 models for misfires which I should have mentioned to OP.
Also, OP's car was taken to an indy and had all plugs changed too. Could spark plug indexing play a role in causing a different cylinder to misfire? Or would that be a fault registers a misfire later on?
OP is a really good guy I'm hoping he can get his car going again.
Good point about the spark plugs. As I understand it, these engines are also sensitive to having correct spark plug gaps. Also, they now messed with all cylinders. Simply removing the spark plug and replacing it could have dislodged some deposits. At some point it may be worth taking a peek inside all cylinders with a borescope and inspect their condition along with potential carbon deposits on the valves.
Thanks for the reply gents. Look as I see it. It's now Cylinder 5. That cylinder was working fine for we replaced the Coil. 8/9 now work but 5 started to misfire. I'm thinking and hoping it's just indexing of the plug.
UPDATE.
Ok got the car back again and was a faulty plug on cylinder 5. Fancy that. Replace all the plugs and one was faulty! Let's see next few weeks. Seems ok for now.
UPDATE.
Ok got the car back again and was a faulty plug on cylinder 5. Fancy that. Replace all the plugs and one was faulty! Let's see next few weeks. Seems ok for now.
So they are thinking that the previous replacement was defective?
This is good advice Swiss I totally forgot there was a software update for 2019 models for misfires which I should have mentioned to OP.
Also, OP's car was taken to an indy and had all plugs changed too. Could spark plug indexing play a role in causing a different cylinder to misfire? Or would that be a fault registers a misfire later on?
OP is a really good guy I'm hoping he can get his car going again.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
