C63/C63S AMG
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Loss of power

Old Jul 1, 2025 | 12:01 AM
  #1  
kwonnycash's Avatar
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2016 c63 wagon
Loss of power

So got my downpipes changed for the stock cats and now got my downpipes back on the car.
car ran fine like it was before performance wise for a short time ,now i see the boost on my dash sometimes halfway of full when im standing still or driving very slow.
when i put my foot down the car does not perform like it normally does.
my car has the pure 900 and black boost intakes.
What could it be?
Was thinking maybe boostleak or turbo acuators?
what do you guys think it might be?
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Old Jul 1, 2025 | 12:27 PM
  #2  
C63_boo's Avatar
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From: Tigard, Oregon
2019 W205 C63 AMG
check out your exhaust flaps in the rear. Shine a light into it and have someone open and close the valves. If one is stuck, that's the issue. That happen to mine. Loss of power was due to exhaust flaps, one was stuck closed and threw a soft limp where you see boost level build and quickly decrease.
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Old Jul 1, 2025 | 01:40 PM
  #3  
kwonnycash's Avatar
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2016 c63 wagon
I parked it at work and when driving back home the car was fine again.
these soft limp and limp modes dont make sense
had a check engine light with limp mode that came once in a while for some time,had it cleared and once it did not work disconnected the battery for a bit and that also fixed it.
anyway thx and i hope it stays away
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Old Jul 4, 2025 | 11:48 AM
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kwonnycash's Avatar
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2016 c63 wagon
Drove it a few times all good now i parked the car went to the store and it came back
Made a quick vid and want to place it here but it wont let me it says your file ...mp4 cant be uploaded or something
How do i add a vid from my phone?
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