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Old Jul 11, 2018 | 04:12 PM
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Engine Knock????

I have 40k miles, Dp and tune, i put some fuel system cleaner this fill up. Could that be the cause?
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Old Jul 11, 2018 | 08:12 PM
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Mercedes specially warns about using any kind of fuel system cleaner in the manual. Why did you do it again? Just curious.
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Old Jul 11, 2018 | 08:59 PM
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Just to "clean" the injectors and fuel system a bit
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Old Jul 11, 2018 | 09:00 PM
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How did you know they were dirty? Did you take gas from a bad pump? Premium gas most of the time will never foul up your fuel system if you get them from any of the top tiered pumps.
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Old Jul 11, 2018 | 09:01 PM
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Chevron Techron is one of the MB approved fuel cleaners btw
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Old Jul 11, 2018 | 09:02 PM
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just to keep them maintained
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Old Jul 11, 2018 | 09:03 PM
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Well I am sure the manual said not to use any. Anyhoo, my suggestion would be to slowly drive and empty this tank. And then get a clean tank of good gas in, and hammer the car. Like absolutely hammer the **** out it. Do multiple 0 to 200kmph runs if possible. Should resolve itself.
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Old Jul 12, 2018 | 03:59 AM
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W212E63s[rwd sold]W211E63[sold] 645ci [sold]2018 C63s Estate[sold], 2017 gla 45 [Sold] E46m3 [sold]
if your tune is one that can be easily unplugged then do that for now.while you empty the tank out
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Old Jul 12, 2018 | 10:38 AM
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Should i try putting a gallon or 2 of E85?
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Old Jul 12, 2018 | 11:00 AM
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Originally Posted by milan25
Should i try putting a gallon or 2 of E85?
Octane isn’t your problem. If anything, just keep topping off with more gas as you drive to dilute the fuel cleaner. I would not take the advice of beating the hell out of the car, in fact, I’d do the opposite. Drive like a grandma and stay out of boost until the fuel is out.

Also, don’t use that stuff in the future. The last thing you want are issues with our direct injection fuel system. Just one injector costs a small fortune.
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Old Jul 12, 2018 | 11:03 AM
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Originally Posted by AlexZTuned


Octane isn’t your problem. If anything, just keep topping off with more gas as you drive to dilute the fuel cleaner. I would not take the advice of beating the hell out of the car, in fact, I’d do the opposite. Drive like a grandma and stay out of boost until the fuel is out.

Also, don’t use that stuff in the future. The last thing you want are issues with our direct injection fuel system. Just one injector costs a small fortune.
That is why I suggested emptying the current tank by driving slowly first. But your way is better. My suggestion to hammer the car was after you are certain you have clean fuel in the car.
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Old Jul 12, 2018 | 02:56 PM
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What tune do you have and when was it tuned?
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Old Jul 12, 2018 | 03:08 PM
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I have a dyno tune from a local shop and have had it for a year and about 17k miles
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Old Jul 12, 2018 | 03:10 PM
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Could it be spark plugs or the Ignition Coils? Haven't changed plugs yet and the dealership said they fixed the coil recall, but I don't go to that dealer anymore. They are pretty bad. So again could it be the coils
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Old Jul 12, 2018 | 03:13 PM
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Originally Posted by milan25
Should i try putting a gallon or 2 of E85?
no thats not going to fix that. and as a general rule, dont put E85 in anything that isnt tuned for it. it sounds like its got a fouled plug or a bad coil. but in my 2015 E63, it would have a flashing CEL and would run like **** when it would burn up a plug.
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Old Jul 12, 2018 | 03:14 PM
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It can be the coils. I have seen coil packs getting busted for tuned cars a lot more often than the stock cars. EC told me the same thing. But you will get misfiring codes 99 percent of the time if that was the case. I would put clean gas in first and driving first before you troubleshoot it further.
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Old Jul 12, 2018 | 03:19 PM
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I really appreciate all your help guys. I'll wait and see i guess. Hope it fixes itself.
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Old Jul 12, 2018 | 03:23 PM
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Originally Posted by milan25
I really appreciate all your help guys. I'll wait and see i guess. Hope it fixes itself.
dude its not going to fix itself. id run the gas down, fill it up, then disconnect the battery, reset the parameters in the ECU, if it keeps doing it, throw a set of plugs in it.
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Old Jul 12, 2018 | 03:38 PM
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Originally Posted by C63SVERT
dude its not going to fix itself. id run the gas down, fill it up, then disconnect the battery, reset the parameters in the ECU, if it keeps doing it, throw a set of plugs in it.
Disconnecting the battery resets the ECU? I heard it doesn't for these newer cars as they have an auxilary battery for back up. You need Xentry to reset adaptations.
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Old Jul 12, 2018 | 04:41 PM
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Originally Posted by munis
Disconnecting the battery resets the ECU? I heard it doesn't for these newer cars as they have an auxilary battery for back up. You need Xentry to reset adaptations.
you may be right. i haven't had to do it on any of my Mercedes. I'm only used to having to do it in any of my past american cars. im also not sure how similar the systems are in your C43 vs a C63.
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Old Jul 12, 2018 | 04:51 PM
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Originally Posted by C63SVERT
you may be right. i haven't had to do it on any of my Mercedes. I'm only used to having to do it in any of my past american cars. im also not sure how similar the systems are in your C43 vs a C63.
There aren't a lot of similarities. But certain things may be common to platforms. I am not sure either, so do not take my word for it. I had some rough shifting problems after an accident. I know for sure that disconnecting the battery, did not reset any of my adaptations. A Xentry TCU reset fixed the problem for me and the tech told me these new cars have an auxiliary battery, so just simply disconnecting the battery would not help reset adaptations.
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Old Aug 4, 2018 | 03:36 PM
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Sorry for a late update, but Cylinder 5 spark plug went out. When is everyone changing their spark plugs? I have 41k miles with stage 2 haven't changed them yet.
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Old Aug 5, 2018 | 01:13 PM
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Went out?
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Old Aug 5, 2018 | 06:02 PM
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Probably means the plug fouled out from running rich.
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Old Aug 6, 2018 | 12:52 AM
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The dealer replaced under warranty, and they said the ceramic part of the spark plug was cracked
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