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Discussion Starter · #1 ·
hi all i have S63 AMG and have misfire detected on 5 6 7 8
spark plugs new
coils news
timing chain checked with tools
ecu tested with other
O2 sensor brand news
car checked and good ( both )
i dont know on how to resolve it

i bank is white and one is black ( color en spark )


thanks if you have idea
 

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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG. 2011 BMW 335d
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6,226 Posts
Take out o2 sensor and start car.
 

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Discussion Starter · #6 ·
cld start i have 8 ok for 10 15sec 1100rpm and after 4 cyl and 750rmp
 

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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG. 2011 BMW 335d
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6,226 Posts
Did you take out the O2 sensor before cat and started car?

Any codes beside the misfire?
 

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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG. 2011 BMW 335d
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6,226 Posts
Not unplug. Physically remove the sensor from the exhaust.
 

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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG. 2011 BMW 335d
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6,226 Posts
Then it's either ECU or bad catalyst converter.
 

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Discussion Starter · #14 ·
l'ecu n'est pas possible car le démarrage à froid j'ai 8 cylindres pendant 10 secondes et après cela seulement 4
une rangée de bougies blanches et l'autre noire, pas d'étincelle
i will try to make CAT off with my KESS
 

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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG. 2011 BMW 335d
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English please. I can't read french.
 

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Discussion Starter · #17 ·
ecu is not possible because during 10sec at cold start i have 8 cyl
one range is white and on i white ( spark plugs )

i will try to make CAT off with my KESS
 

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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG. 2011 BMW 335d
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6,226 Posts
That is not conclusive. Could still be bad ECU, just because the car runs good for 10 sec doesn't mean it's good ECU.
 

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'71 Pinto
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Suggestions:

If are not already doing so use Xentry (MB diagnostics). You have done several already here is a basic list of steps to consider. In addition, attached bulletin containing additional procedures although it was released for different engine apply same suggested remedies for your vehicle.

  • check for signs of external oil loss
  • check exhaust gases (blue smoke)
  • perform short test with freeze frame data
  • perform compression and leak-down tests
  • check spark plugs
  • bore scope cylinders
  • check O2 sensors, turbos, cats, exhaust components
 

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