C43 misfire nightmare (eurocharged)
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Joined: May 2024
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2018 C43
C43 misfire nightmare (eurocharged)
Car: 18’ C43 (Eurocharged stage 1)
Codes: p0300-p0306 (and all in between)
When?: Only with pedal to floor/full throttle. Drives %100 fine when just cruising even for long distance.
Repairs: replaced all plugs 3 times, all coils twice, all fuel injectors, maf and cps sensor
Story:
Drove my c43 for 10-12,000 miles after buying it, drove beautiful %100 perfect. Brought it into Eurocharged to get tuned and new spark plugs and within the hour after tuning it misfired. Owner of the shop said it was normal, but it kept persisting so I brought it in, they said my brand new plugs needed cleaned?. Few weeks down the road I get all new coils, maf sensor, cps sensor, and it’s still doing it. I bring it in and they say it’s the learning computer, reset it, and it does it again after I leave shop. Brought it in yet another time for diagnostic ($180 an hour) and say I need new fuel injectors (quoted at 4k). Get them, and still is misfiring! I bring it to another ec location 5hrs away, they say the first ec shop never installed proper oem plugs or coils, so they did that ($1,100) and it misfired on my way home. I’ve had it diagnosed by Eurocharged 6+ times and I just get parts thrown at my face I’m sick of it. Help what do you guys think, Eurocharged is sending me a new check valve to try.
its mind blowing how many times Eurocharged has handed me my car back and it’s been “perfectly fine” just to misfire always almost immediately after leaving shop, I’ve begged them to do a proper diagnosis especially with how much money they’ve made me literally waste, and every time it’s the most basic repair to not fix it, I’ve spent well over 5 grand because of misdiagnosis now.
Codes: p0300-p0306 (and all in between)
When?: Only with pedal to floor/full throttle. Drives %100 fine when just cruising even for long distance.
Repairs: replaced all plugs 3 times, all coils twice, all fuel injectors, maf and cps sensor
Story:
Drove my c43 for 10-12,000 miles after buying it, drove beautiful %100 perfect. Brought it into Eurocharged to get tuned and new spark plugs and within the hour after tuning it misfired. Owner of the shop said it was normal, but it kept persisting so I brought it in, they said my brand new plugs needed cleaned?. Few weeks down the road I get all new coils, maf sensor, cps sensor, and it’s still doing it. I bring it in and they say it’s the learning computer, reset it, and it does it again after I leave shop. Brought it in yet another time for diagnostic ($180 an hour) and say I need new fuel injectors (quoted at 4k). Get them, and still is misfiring! I bring it to another ec location 5hrs away, they say the first ec shop never installed proper oem plugs or coils, so they did that ($1,100) and it misfired on my way home. I’ve had it diagnosed by Eurocharged 6+ times and I just get parts thrown at my face I’m sick of it. Help what do you guys think, Eurocharged is sending me a new check valve to try.
its mind blowing how many times Eurocharged has handed me my car back and it’s been “perfectly fine” just to misfire always almost immediately after leaving shop, I’ve begged them to do a proper diagnosis especially with how much money they’ve made me literally waste, and every time it’s the most basic repair to not fix it, I’ve spent well over 5 grand because of misdiagnosis now.
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Posts: 342
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2015 C400 4MATIC Palladium Silver Metallic
Car: 18’ C43 (Eurocharged stage 1)
Codes: p0300-p0306 (and all in between)
When?: Only with pedal to floor/full throttle. Drives %100 fine when just cruising even for long distance.
Repairs: replaced all plugs 3 times, all coils twice, all fuel injectors, maf and cps sensor
Story:
Drove my c43 for 10-12,000 miles after buying it, drove beautiful %100 perfect. Brought it into Eurocharged to get tuned and new spark plugs and within the hour after tuning it misfired. Owner of the shop said it was normal, but it kept persisting so I brought it in, they said my brand new plugs needed cleaned?. Few weeks down the road I get all new coils, maf sensor, cps sensor, and it’s still doing it. I bring it in and they say it’s the learning computer, reset it, and it does it again after I leave shop. Brought it in yet another time for diagnostic ($180 an hour) and say I need new fuel injectors (quoted at 4k). Get them, and still is misfiring! I bring it to another ec location 5hrs away, they say the first ec shop never installed proper oem plugs or coils, so they did that ($1,100) and it misfired on my way home. I’ve had it diagnosed by Eurocharged 6+ times and I just get parts thrown at my face I’m sick of it. Help what do you guys think, Eurocharged is sending me a new check valve to try.
its mind blowing how many times Eurocharged has handed me my car back and it’s been “perfectly fine” just to misfire always almost immediately after leaving shop, I’ve begged them to do a proper diagnosis especially with how much money they’ve made me literally waste, and every time it’s the most basic repair to not fix it, I’ve spent well over 5 grand because of misdiagnosis now.
Codes: p0300-p0306 (and all in between)
When?: Only with pedal to floor/full throttle. Drives %100 fine when just cruising even for long distance.
Repairs: replaced all plugs 3 times, all coils twice, all fuel injectors, maf and cps sensor
Story:
Drove my c43 for 10-12,000 miles after buying it, drove beautiful %100 perfect. Brought it into Eurocharged to get tuned and new spark plugs and within the hour after tuning it misfired. Owner of the shop said it was normal, but it kept persisting so I brought it in, they said my brand new plugs needed cleaned?. Few weeks down the road I get all new coils, maf sensor, cps sensor, and it’s still doing it. I bring it in and they say it’s the learning computer, reset it, and it does it again after I leave shop. Brought it in yet another time for diagnostic ($180 an hour) and say I need new fuel injectors (quoted at 4k). Get them, and still is misfiring! I bring it to another ec location 5hrs away, they say the first ec shop never installed proper oem plugs or coils, so they did that ($1,100) and it misfired on my way home. I’ve had it diagnosed by Eurocharged 6+ times and I just get parts thrown at my face I’m sick of it. Help what do you guys think, Eurocharged is sending me a new check valve to try.
its mind blowing how many times Eurocharged has handed me my car back and it’s been “perfectly fine” just to misfire always almost immediately after leaving shop, I’ve begged them to do a proper diagnosis especially with how much money they’ve made me literally waste, and every time it’s the most basic repair to not fix it, I’ve spent well over 5 grand because of misdiagnosis now.
I got lucky and my first tune from EC Houston was pretty good, I did a bunch of 1/4 mile data logging and sent them back the data just to be sure everything was kosher.
They were very nice to offer me an enhanced tune (I guess because I gave them so much real world data), but the instant I loaded the second tune I had massive issues, misfires, hiccups, transmission codes.
I just flashed it back to the first tune that was pretty good, and am using a JB4 on top for additional boost on the top end.
Thread Starter
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Joined: May 2024
Posts: 20
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2018 C43
It's the tune. Ask them to flash it back and get a JB4 if you want more power.
I got lucky and my first tune from EC Houston was pretty good, I did a bunch of 1/4 mile data logging and sent them back the data just to be sure everything was kosher.
They were very nice to offer me an enhanced tune (I guess because I gave them so much real world data), but the instant I loaded the second tune I had massive issues, misfires, hiccups, transmission codes.
I just flashed it back to the first tune that was pretty good, and am using a JB4 on top for additional boost on the top end.
I got lucky and my first tune from EC Houston was pretty good, I did a bunch of 1/4 mile data logging and sent them back the data just to be sure everything was kosher.
They were very nice to offer me an enhanced tune (I guess because I gave them so much real world data), but the instant I loaded the second tune I had massive issues, misfires, hiccups, transmission codes.
I just flashed it back to the first tune that was pretty good, and am using a JB4 on top for additional boost on the top end.
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 4
2018 C43
Last edited by Rickcross; Jun 3, 2024 at 05:39 PM.
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2015 C400 4MATIC Palladium Silver Metallic
Senior Member
Joined: Mar 2022
Posts: 342
Likes: 112
2015 C400 4MATIC Palladium Silver Metallic
One additional thing I want you to try before you lose all hope is maybe find and E85 fuel pump and put 2 gallons in on an empty tank and then fill up.
Or you can try a quality Octane booster like VP Racing Madditive Octanium.
Especially since you are only having the problem at WOT.
Or you can try a quality Octane booster like VP Racing Madditive Octanium.
Especially since you are only having the problem at WOT.
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MBWorld Fanatic!
Joined: May 2021
Posts: 1,317
Likes: 200
From: Plainfield IL
Amg C43
Eurocharged was the way I was thinking I might go, but hate what I’m hearing. Issues can arise obvi, but that customer service SUCKS
where r u located at?
where r u located at?
Last edited by MaverickC43; Jun 3, 2024 at 11:09 PM. Reason: Forgot
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Thread Starter
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Joined: May 2024
Posts: 20
Likes: 4
2018 C43
Midwest, just take into consideration I had purchased the c43 with a perfect service record at 47k miles. Drove the car myself for 10-12k miles then got it ec stage 1 tuned, and within the first hour it misfired.
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 4
2018 C43
One additional thing I want you to try before you lose all hope is maybe find and E85 fuel pump and put 2 gallons in on an empty tank and then fill up.
Or you can try a quality Octane booster like VP Racing Madditive Octanium.
Especially since you are only having the problem at WOT.
Or you can try a quality Octane booster like VP Racing Madditive Octanium.
Especially since you are only having the problem at WOT.
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Joined: Feb 2007
Posts: 613
Likes: 294
From: Republic of Texas
W203 W212 W211 R53MCS
One thing you guys have to understand, is that most of these tuning locations are franchises. So tunes get passed around and copied over and over. I have been a Mercedes Benz specialist for 18 years and I deal with these all the time. So here is what I think is happening, your car is running super rich. So every time they change plugs, it runs good until they get full of carbon due to running too rich. So even if you go back to stock, make sure you check, clean or replace your plugs. I have also ran into internal ecu damage and have replaced ECU's after it gets tuned. If you need advise or assistance, send me a PM.
Senior Member
Joined: Mar 2022
Posts: 342
Likes: 112
2015 C400 4MATIC Palladium Silver Metallic
One thing you guys have to understand, is that most of these tuning locations are franchises. So tunes get passed around and copied over and over. I have been a Mercedes Benz specialist for 18 years and I deal with these all the time. So here is what I think is happening, your car is running super rich. So every time they change plugs, it runs good until they get full of carbon due to running too rich. So even if you go back to stock, make sure you check, clean or replace your plugs. I have also ran into internal ecu damage and have replaced ECU's after it gets tuned. If you need advise or assistance, send me a PM.
Is it rich? Is it lean? Is the timing too retarded or advanced?
No way to know without data logs.
Thread Starter
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Joined: May 2024
Posts: 20
Likes: 4
2018 C43
I totally agree with your take on all the different "tuners" out there who are really just flashing a file they did zero development on, in this particular case the plugs have been done three times and it misfires within hours, sometimes minutes of the new plugs being installed.
Is it rich? Is it lean? Is the timing too retarded or advanced?
No way to know without data logs.
Is it rich? Is it lean? Is the timing too retarded or advanced?
No way to know without data logs.
Last edited by Rickcross; Jun 5, 2024 at 11:01 AM.
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 4
2018 C43
One thing you guys have to understand, is that most of these tuning locations are franchises. So tunes get passed around and copied over and over. I have been a Mercedes Benz specialist for 18 years and I deal with these all the time. So here is what I think is happening, your car is running super rich. So every time they change plugs, it runs good until they get full of carbon due to running too rich. So even if you go back to stock, make sure you check, clean or replace your plugs. I have also ran into internal ecu damage and have replaced ECU's after it gets tuned. If you need advise or assistance, send me a PM.
Last edited by Rickcross; Jun 5, 2024 at 11:01 AM.
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From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
That the shop did not flash it back in the diagnostic process is a problem to read. Unfortunately many tuners standing beliefs are that tunes expose weakness so its normal to have some slight issues or to have to replace some sensors after a tune. Generally codes are very specific and you dont have to change "all" of the coil packs, spark plugs, both turbos, etc. That is a shotgun approach and not appropriate for what you say is happening.
There is only one variable you mentioned that is causing the problem yet the tuner is having you chase your tail. You had no problems or latent pending codes, installed a tune and it all went downhill. Its a bad tune, dont mess up a bunch of other parts or spend more money or time diagnosing the obvious. No need to protect a tuner by not doing proper diagnostics first (meaning reflash to reg tune before one penny was spent).
Sure its true that thousands of these "same" tunes are on cars all across the world and the fact is, it does not work 100% for all of them the same (due to differences in temperature and humidity, and running parameters defined by region) and revisions need to be made.
This is a situation where I really advocate that people have xentry personally and dont waste thousands chasing a shops poor but very expensive diagnostic procedures. Has a TPS or gas pedal been diagnosed? Has a rich or lean condition been diagnosed per MBenztech? Are the plugs fouling if the car is not taken to the misfire range at WOT?
Good Luck
There is only one variable you mentioned that is causing the problem yet the tuner is having you chase your tail. You had no problems or latent pending codes, installed a tune and it all went downhill. Its a bad tune, dont mess up a bunch of other parts or spend more money or time diagnosing the obvious. No need to protect a tuner by not doing proper diagnostics first (meaning reflash to reg tune before one penny was spent).
Sure its true that thousands of these "same" tunes are on cars all across the world and the fact is, it does not work 100% for all of them the same (due to differences in temperature and humidity, and running parameters defined by region) and revisions need to be made.
This is a situation where I really advocate that people have xentry personally and dont waste thousands chasing a shops poor but very expensive diagnostic procedures. Has a TPS or gas pedal been diagnosed? Has a rich or lean condition been diagnosed per MBenztech? Are the plugs fouling if the car is not taken to the misfire range at WOT?
Good Luck
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 4
2018 C43
That the shop did not flash it back in the diagnostic process is a problem to read. Unfortunately many tuners standing beliefs are that tunes expose weakness so its normal to have some slight issues or to have to replace some sensors after a tune. Generally codes are very specific and you dont have to change "all" of the coil packs, spark plugs, both turbos, etc. That is a shotgun approach and not appropriate for what you say is happening.
There is only one variable you mentioned that is causing the problem yet the tuner is having you chase your tail. You had no problems or latent pending codes, installed a tune and it all went downhill. Its a bad tune, dont mess up a bunch of other parts or spend more money or time diagnosing the obvious. No need to protect a tuner by not doing proper diagnostics first (meaning reflash to reg tune before one penny was spent).
Sure its true that thousands of these "same" tunes are on cars all across the world and the fact is, it does not work 100% for all of them the same (due to differences in temperature and humidity, and running parameters defined by region) and revisions need to be made.
This is a situation where I really advocate that people have xentry personally and dont waste thousands chasing a shops poor but very expensive diagnostic procedures. Has a TPS or gas pedal been diagnosed? Has a rich or lean condition been diagnosed per MBenztech? Are the plugs fouling if the car is not taken to the misfire range at WOT?
Good Luck
There is only one variable you mentioned that is causing the problem yet the tuner is having you chase your tail. You had no problems or latent pending codes, installed a tune and it all went downhill. Its a bad tune, dont mess up a bunch of other parts or spend more money or time diagnosing the obvious. No need to protect a tuner by not doing proper diagnostics first (meaning reflash to reg tune before one penny was spent).
Sure its true that thousands of these "same" tunes are on cars all across the world and the fact is, it does not work 100% for all of them the same (due to differences in temperature and humidity, and running parameters defined by region) and revisions need to be made.
This is a situation where I really advocate that people have xentry personally and dont waste thousands chasing a shops poor but very expensive diagnostic procedures. Has a TPS or gas pedal been diagnosed? Has a rich or lean condition been diagnosed per MBenztech? Are the plugs fouling if the car is not taken to the misfire range at WOT?
Good Luck
Last edited by Rickcross; Jun 5, 2024 at 01:02 PM.
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 4
2018 C43
That the shop did not flash it back in the diagnostic process is a problem to read. Unfortunately many tuners standing beliefs are that tunes expose weakness so its normal to have some slight issues or to have to replace some sensors after a tune. Generally codes are very specific and you dont have to change "all" of the coil packs, spark plugs, both turbos, etc. That is a shotgun approach and not appropriate for what you say is happening.
There is only one variable you mentioned that is causing the problem yet the tuner is having you chase your tail. You had no problems or latent pending codes, installed a tune and it all went downhill. Its a bad tune, dont mess up a bunch of other parts or spend more money or time diagnosing the obvious. No need to protect a tuner by not doing proper diagnostics first (meaning reflash to reg tune before one penny was spent).
Sure its true that thousands of these "same" tunes are on cars all across the world and the fact is, it does not work 100% for all of them the same (due to differences in temperature and humidity, and running parameters defined by region) and revisions need to be made.
This is a situation where I really advocate that people have xentry personally and dont waste thousands chasing a shops poor but very expensive diagnostic procedures. Has a TPS or gas pedal been diagnosed? Has a rich or lean condition been diagnosed per MBenztech? Are the plugs fouling if the car is not taken to the misfire range at WOT?
Good Luck
There is only one variable you mentioned that is causing the problem yet the tuner is having you chase your tail. You had no problems or latent pending codes, installed a tune and it all went downhill. Its a bad tune, dont mess up a bunch of other parts or spend more money or time diagnosing the obvious. No need to protect a tuner by not doing proper diagnostics first (meaning reflash to reg tune before one penny was spent).
Sure its true that thousands of these "same" tunes are on cars all across the world and the fact is, it does not work 100% for all of them the same (due to differences in temperature and humidity, and running parameters defined by region) and revisions need to be made.
This is a situation where I really advocate that people have xentry personally and dont waste thousands chasing a shops poor but very expensive diagnostic procedures. Has a TPS or gas pedal been diagnosed? Has a rich or lean condition been diagnosed per MBenztech? Are the plugs fouling if the car is not taken to the misfire range at WOT?
Good Luck
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 4
2018 C43
I totally agree with your take on all the different "tuners" out there who are really just flashing a file they did zero development on, in this particular case the plugs have been done three times and it misfires within hours, sometimes minutes of the new plugs being installed.
Is it rich? Is it lean? Is the timing too retarded or advanced?
No way to know without data logs.
Is it rich? Is it lean? Is the timing too retarded or advanced?
No way to know without data logs.
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 4
2018 C43
One thing you guys have to understand, is that most of these tuning locations are franchises. So tunes get passed around and copied over and over. I have been a Mercedes Benz specialist for 18 years and I deal with these all the time. So here is what I think is happening, your car is running super rich. So every time they change plugs, it runs good until they get full of carbon due to running too rich. So even if you go back to stock, make sure you check, clean or replace your plugs. I have also ran into internal ecu damage and have replaced ECU's after it gets tuned. If you need advise or assistance, send me a PM.
Thread Starter
Junior Member
Joined: May 2024
Posts: 20
Likes: 4
2018 C43
went back to stock today, drove 4+ hrs as aggressive as possible through the southern Missouri mountains, haven’t been able to make it misfire once and I’ve been trying my hardest
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C43
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Joined: Feb 2024
Posts: 41
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C43
I totally agree with your take on all the different "tuners" out there who are really just flashing a file they did zero development on, in this particular case the plugs have been done three times and it misfires within hours, sometimes minutes of the new plugs being installed.
Is it rich? Is it lean? Is the timing too retarded or advanced?
No way to know without data logs.
Is it rich? Is it lean? Is the timing too retarded or advanced?
No way to know without data logs.
