Engine drops power, hard acceleration between 30-45 mph
#1
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Engine drops power, hard acceleration between 30-45 mph
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?
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?
#2
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
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?
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?
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
#3
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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
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
Should it not register some codes on the computer?
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#8
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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.
Upon hard acceleration power drops momentarily around 30 mph. Said it could be the turbos.
#9
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LOL it is not the turbos as they are not speed dependent.....Something is happening and triggering electrical nannies most likely...
#11
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Happens in seconds
#12
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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
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Ds2016E63s (08-06-2019)
#13
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
but if the OP's rpms are dropping then yes .. engine is cutting power and I'm curious to know why
#15
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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
#16
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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)....
#17
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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.
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.
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Siegmann (08-06-2019)
#18
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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.
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.
#19
Member
Thread Starter
#20
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
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
#21
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Thread Starter
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.
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.
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maddrgee (04-25-2023)
#22
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I
Similar issues c63S and e63S w213 Guys had, glad it is better!! Told ya it was a simple fix
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.
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.
#24
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Thread Starter
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.
#25
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
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.
https://mbworld.org/forums/w212-amg/...-annoying.html