Ds2016E63s

Lately upon medium to hard acceleration the car drops power between 30 to 45 mph but I think the RPM seem to spike.

It creates a safety issue when hitting the gas to accelerate to pass a vehicle and all of a sudden the car loses power but than resumes acceleration. Happens in seconds but is very noticeable at least to me.

Any ideas on what I should zero-in on prior to contacting the dealership?

PeterUbers

Have you tested hard acceleration when in manual to see if it's the trans vs the engine?

this initially strikes me as a trans slip from 2-3 ... could be a valve body issue or clutch pack problem

if you lose power in the rpm band while fixed in a gear then you have some engine problem

Ds2016E63s

Thanks. Will try in manual mode.

Should it not register some codes on the computer?

PeterUbers

Not necessarily

have you scanned for codes?

Ds2016E63s

Nope. Do not have the equipment to do so

PeterUbers

$40 on amazon

http://OBD2 Scanner Bluetooth 4.0 OB..._J2WrDbV75JVJK

e65

Take a video of the tachometer and speedometer when this happens. The cell phone mount or passenger.

Ds2016E63s

Took to local MB dealership and Shop Foreman and I went for a drive. He was able to replicate the problem repeatedly.

Upon hard acceleration power drops momentarily around 30 mph. Said it could be the turbos.

cij911

LOL it is not the turbos as they are not speed dependent.....Something is happening and triggering electrical nannies most likely...

e65

Taking a video of the speedometer and tachometer will reveal if the clutches are slipping or not.

Ds2016E63s

I should have taken the videos while the dealer was driving but did not. The engine drops power, the tach drops to zero than bounces back as engine power is restored.

Happens in seconds

cij911

It sure sounds like you are seeing some sort of ECU power kill....If your transmission were slipping the tach would not drop to zero....Tach dropping to zero basically means the engine cut-off (almost like in eco mode at a stop)....very odd....most likely some stupid sensor and nothing huge

PeterUbers

This similar issues happened with the c63S crowd and some e63S w213 guys and it turned out to be drop in turbo boost ... and a fairly simple fix

but if the OP's rpms are dropping then yes .. engine is cutting power and I'm curious to know why

e65

if the car is in gear the RPM should not drop.

Ds2016E63s

car is in gear, comfort mode (might happen in other modes as well) doing approximately 30 mph, when upon hard acceleration, power drops, tach bounces to zero and back, then power is restored. all of this happens in less than 1 second

cij911

try turning off eco start in comfort mode and see if that solves the issue....sure sounds like the eco is turning the car off (the only way tach would go to 0)....

Ds2016E63s

Just heard back from the dealership, but have not picked up the car yet.

They traced the issue to a wiring harness that is connected to the turbos. Apparently it had developed a short circuit due to heat & vibration which caused an electrical short and grounding issue effecting the turbos to not engage. The fix was electrical tape and silicone. They say it has solved both the lack of power from the start and momentary engine shut off at 30 mph.

They indicated this is not the main wiring harness for the car, but a wiring harness that connects to the turbos. Apparently MB would not authorize a replacement of the wiring harness, only a repair.

Believe the damage to the wiring harness may have been heat related causing some of the wiring to be exposed. When accelerating wires touched causing a grounding issue. So I guess this would be called an Electrical Issue.

And the winner is: cij911

"LOL it is not the turbos as they are not speed dependent.....Something is happening and triggering electrical nannies most likely..."



Hopefully this fixes it.

cij911

Sorry the dealer explanation is ridiculous. The turbos are spun by exhaust gases, so and there is nothing electrical that controls them. Ask them which wire loom was damaged....Thanks

Ds2016E63s

is the Wastegate electrically powered?

kponti

The turbos are controlled electrically via the solenoid and wastegates controlling how much boost the car can make and when (another tool in torque management arsenal for the ecu/tcu).
That is why you can have the ecu "request" a certain amount of boost at any given throttle position and rpm, also how tuners get more boost

Long story short, the turbos are electrically controlled

Ds2016E63s

I have the work order in front of me now. DTC stored codes P06DB00 - the actuation of the valve of the oil pump in the combustion engine has a short circuit to ground. Code P06DA00 - the actuation of the valve of the oil pump in the combustion engine has an electrical fault or open circuit

Performed electrical test check integrity of wiring connector (M) PIN 81 AT (ME) Control Module to Y130 Pump upon wiggling harness there is short circuit in the harness control wire indicates resistance to ground .10 OHMS very intermittently

Engine wiring harness found 130 Oil Pump Harness was touching harmonic balancer hair line short

Rerouted harness and repaired

Reset codes. Drove 20 miles, no codes. Engine performance and power back to normal.

PeterUbers

ISimilar issues c63S and e63S w213 Guys had, glad it is better!! Told ya it was a simple fix

Ds2016E63s

What does the Y130 directional valve send oil to?

Ds2016E63s

I have only driven the car a few miles since getting it back from the shop. So far unable to reproduce the same problem at hard acceleration between 30-35 mph, but it seems there is still some hesitation when accelerating from 0 mph. Car is in comfort mode, but just not sure it is normal or is it something I should be concerned about.

PeterUbers

likely normal, my tune solved this for me more than the sprintbooster

https://mbworld.org/forums/w212-amg/...-annoying.html