palolo6.2

Wondering if anyone else experienced this...

I have a 2015 507 coupe, about 3500 miles.

Car is in sport mode and completely warmed up after driving about 45 minutes. I came to a complete stop, then started rolling very slowly waiting for opening in traffic. Road has a very slight incline. Weather has been both hot and cool so does not seem to be related to air temp.

I hit the accelerator and nothing happens or engine revs ever so slightly. After about 5-10 seconds and repeated pumping of accelerator pedal or just letting the car roll a bit, the engine suddenly responds and all is well again.

It's happened about 3-4 times over past few months, always only in same spot on the road, never anywhere else--even if situationally I'm doing the same things (sport mode, rolling slightly, car warmed up). I've tried to intentionally replicate it by doing the same thing in the same spot on the road but I cannot make it happen. It happens randomly--pretty damn scary.

Last episode it felt like the transmission kicked down then the engine responded. When it happens I'm caught off guard and had other cars behind me honking so I'm not paying attention to whether I car was still in 1st gear though it should have been. Did not recall seeing any codes either.

Probably need to take it to the dealership but I worry that they cannot replicate the problem because I've tried and cannot.

Hoping this problem sounds familiar to someone else.

8o8is

ESP kicking in? Engine output limited to control wheelspin. BTW, you located in Hawaii?

betrezra

my wife ran a tank of cheap grocery store gas in her c63 2 wks ago and it was a dog...., i suspect the ecu was det knock and pulled timing to keep eng safe.

a possibility for you..

gl

betrezra

dbl post. please delete.....

palolo6.2

Thought about that but I am not hitting the accelerator hard, sometimes just enough to merge into traffic and everything goes limp. You think ESP is confused and kicking in?

BTW--I grew up in Hawaii, Palolo Valley.

palolo6.2

I would think if it was bad gas it would happen in more often and not always in the same place, same street. And the car performs well all other situations.

Surge

Transmission clutch not engaging?
Try being in manual at the same spot. (Note that owners manual says you should be stopped before switching to Manual mode).

betrezra

re-reading your issue, I did have a problem like this on my clk55 W209 car. The throttle body connectors would get loose and get oxidized resulting in a dead pedal situation randomly.

This can also be caused by a bad throttle pedal.

I would see the dealer for any codes.

GL.

palolo6.2

If this were the case wouldn't the engine still rev? Sometimes absolutely nothing happens, or I might get a really slight rev.

BTW I have tried this but I can't seem to make it happen when I want to, always catches me by surprise.

palolo6.2

This seems to be the possibility that makes the most sense, although the whole thing is strange and unnerving in terms of when it does or does not occur. I just hope the dealership can find a bad throttle body connector if the symptom doesn't occur when they have the car.

AMGMD

iTrader: (1)

Do you have an LSD? My Quaife LSD made a huge difference in merging situations. No more power cuts. Have you tried the ECU/TCU reset? You can try this and see if it helps also.

https://mbworld.org/forums/c63-amg-w...et-my-ecu.html

palolo6.2

Just tried this, how do you know if it reset?