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S2 3b engine problem - when cold

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  • S2 3b engine problem - when cold

    There is malfunction in my S2 3B - it has an REV cut out when cold - the symptops are like this - when engine is cold it starts good, but when adding throttle it CUTS OUT the ignition at 1500 RPM - and don't let engine to rev higher than this. When engine getting warmer and warmer - it cut out in every minute a little bit higher - at 1600, 1800, 2000, and so, and finally when engine reaches higher temperature - about 60-70 degree C , it stops cutting at about 2500-2800 rpm, then ocassionally cuts out at about 3000 rpm, not every time ! - and when engine is hot, it never cuts out, except 7000 rpm ofcourse.
    The problem is VERY anoying - it's winter now, I got to first warm up the engine, before I can take a trip.

    VAG reports no errors... What could it be ? I only use Shell Vpower Racing fuel.
    Any suggestions are welcome!

    OOOO

    www.AudiKlub.org - the oldest and biggest Audi Club in Poland :thumbs:

  • #2
    Hello!

    It's me, again Back to this - same car, same old problems
    What i've done in meantime AAN conversion, with new program. Problem seems to be the same...
    Any suggestions?

    Thanks!
    OOOO

    www.AudiKlub.org - the oldest and biggest Audi Club in Poland :thumbs:

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    • #3
      There is a sensor on the rear of the head, forget the number but i seem to remember these go out of tolerance and then you get issues with cold starting. It sits directly below the small bore pipe from the rocker cover and has a two pin plug that pushes on.
      sigpic

      1992 3b S2 Coupe

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      • #4
        http://www.s2central.com/ds_G62.html this one!
        sigpic

        1992 3b S2 Coupe

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        • #5
          Did you change the loom to AAN or do the pin swap on the 3B loom?

          S2 Coupe 3B Project


          Ur quattro restoration

          S2 Avant

          Boost is the new rock and roll!
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