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The car seems to have like a pulse only in comfort mode and only when the cars cold or warming up the pulses only last like 2 seconds multiple times till the cars warm,
Sounds like misfires, although that usually results in a flashing CEL, but first thing would be to hook up a diagnostics tool and read out the codes to see if any errors are being logged.
Sounds like misfires, although that usually results in a flashing CEL, but first thing would be to hook up a diagnostics tool and read out the codes to see if any errors are being logged.
yes I plugged one in, there are no codes
it’s wouldn’t be a vacuum like or a boost leak right??
:spark plugs and coil packs were recently done also
Last edited by stock_c63s; Nov 4, 2023 at 05:53 PM.
Vacuum leak can cause rough idle, but would also likely cause error codes. If the spark plugs and coils were replaced recently, that's where I'd start. My understanding is the M177 is somewhat sensitive to proper spark plug gap. Are you tuned?
Vacuum leak can cause rough idle, but would also likely cause error codes. If the spark plugs and coils were replaced recently, that's where I'd start. My understanding is the M177 is somewhat sensitive to proper spark plug gap. Are you tuned?
Right now I have a stage 2 tune but no cat delete, the only thing I find strange is that it’s only in comfort mode or when the cars cold that’s the only time it does it
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Originally Posted by stock_c63s
Right now I have a stage 2 tune but no cat delete, the only thing I find strange is that it’s only in comfort mode or when the cars cold that’s the only time it does it
No need to post two topics but yep my car will do this too (2017 Coupe) but I have noticed it usually only happens:
COMFORT or SPORT mode (when the idle is lower)
Fuel tank us under half
I haven't driven it for 2 or more days
Does this sound familiar to you? Or does yours just "skip" all the time, every time?
No need to post two topics but yep my car will do this too (2017 Coupe) but I have noticed it usually only happens:
COMFORT or SPORT mode (when the idle is lower)
Fuel tank us under half
I haven't driven it for 2 or more days
Does this sound familiar to you? Or does yours just "skip" all the time, every time?
sounds similar to what mine is doing, it doesn’t do it every time but often, do u have any videos of it happening? Sounds like we might have the same problem tho
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Originally Posted by stock_c63s
sounds similar to what mine is doing, it doesn’t do it every time but often, do u have any videos of it happening? Sounds like we might have the same problem tho
I don't have a video because I can't get it to happen. It's just totally random.
To explain it, if I'm stopped at the lights and in COMFORT mode or SPORT, i'll feel this quick pulse through my foot as I'm resting my foot on the accelerator (I use the brake HOLD) often.
The sound basically goes "TUG" and you can feel it through the pedal. Then driving the car it'll be perfect and not happen again for a while. But sort of makes you wary of it until it happens again.
No CEL or errors so far.
Is that it?
Only when the idle is like this
Last edited by Jimmy_c63s; Nov 4, 2023 at 08:04 PM.
I don't have a video because I can't get it to happen. It's just totally random.
To explain it, if I'm stopped at the lights and in COMFORT mode or SPORT, i'll feel this quick pulse through my foot as I'm resting my foot on the accelerator (I use the brake HOLD) often.
The sound basically goes "TUG" and you can feel it through the pedal. Then driving the car it'll be perfect and not happen again for a while. But sort of makes you wary of it until it happens again.
No CEL or errors so far.
Is that it?
Only when the idle is like this
yup, that’s my exact problem. The car has no codes or nothing it just does that randomly. Don’t know what it could be, any ideas?
yup, that’s my exact problem. The car has no codes or nothing it just does that randomly. Don’t know what it could be, any ideas?
Could possibly be as simple as fuel quality or some sludge in the tank that gets sucked in periodically. Comfort and Sport have a lower idle rpm which isn't quite as stable as the higher idle rpm in S+ and RACE.
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Originally Posted by stock_c63s
yup, that’s my exact problem. The car has no codes or nothing it just does that randomly. Don’t know what it could be, any ideas?
It's got to be one of the following:
Coil
Vacuum leak
Injector
Bad/stagnant fuel
But a bad injector will have a CEL and a telltale sign it's an injector is keep an eye on your ECO START/STOP button on the console. If it fails to light up and won't work, the injector is on it's way out and it's time to get it tested or change it.
So I'm kind of stumped at the moment 🙁
Last edited by Jimmy_c63s; Nov 4, 2023 at 08:31 PM.
A telltale sign it's an injector is keep an eye on your ECO START/STOP button on the console. If it fails to light up and won't work, the injector is on it's way out and it's time to get it tested or change it.
going to try that out tomorrow, does the light always have to be on?
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Originally Posted by stock_c63s
going to try that out tomorrow, does the light always have to be on?
how can I check for a vacuum leak tho?
I doubt it's your injector though because you'd be getting a CEL. When was the last time you filled up gas? Do you notice this happens when you don't drive your car for a few days?
I doubt it's your injector though because you'd be getting a CEL. When was the last time you filled up gas? Do you notice this happens when you don't drive your car for a few days?
it’s been happening for a while I’ve been through like 4 tanks of gas since it started I think, not sure if it happeneds when I don’t drive the car for a while, but yesterday I started the car and it didn’t do the pulse like it normally would do, then I started it today and it did the pulsing again
have you took ur car to a mechanic or dealer to get it looked at for the problem?
Last edited by stock_c63s; Nov 4, 2023 at 08:42 PM.
But a bad injector will have a CEL and a telltale sign it's an injector is keep an eye on your ECO START/STOP button on the console. If it fails to light up and won't work, the injector is on it's way out and it's time to get it tested or change it.
So I'm kind of stumped at the moment 🙁
tried it out today and the start/stop button works
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