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Audi S8 D3

Rémon Sep 12, 2020

  1. Rémon

    Rémon Registered User

    9
    3
    3
    Hi,

    My S8 is due for new spark plugs. The engine is standard, except for an ECU tune/REMAP.
    Which plugs are best to use?

    Furthermore, I keep getting these annoying codes after about 150-200 km: P0171 & P0174

    Changed the fuel filter, that didn't help. Engine idle's rough when cold.

    Would be very grateful for a some advice.
     
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  3. Homer Simpson

    Homer Simpson Tiptronic

    54
    10
    8
    I would use plugs from Audi/TPS or the OEM equivalent.

    The codes refer to a lean mixture. Have you checked the the vent hose that runs across the top-rear of the engine?

    Incidentally, what gains did you get from the remap? Was it after manifold flap removal?
     
  4. Homer Simpson

    Homer Simpson Tiptronic

    54
    10
    8
    I would use plugs from Audi/TPS or the OEM equivalent.

    The codes refer to a lean mixture. Have you checked the the vent hose that runs across the top-rear of the engine?

    Incidentally, what gains did you get from the remap? Was it after manifold flap removal?
     
  5. Rémon

    Rémon Registered User

    9
    3
    3
    Thank you for your response!
    I found that the NGK Laser Platinum Resistor PFR6WTG/5547, should be the original plugs.
    I'll order these.

    I'll check the vent hose tomorrow in daylight.

    The remap was done before I owned the car. The precious owner commented that the response became better.
    The flaps are still in there actually. I cleaned them this summer after cleaning the ports.
    It is better to remove the flaps?
     

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