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  • RS2 Rough idle

    Hi! My freshly rebuilt ADU engine is not idling good and when hot, 90c it stalls if I don't open the throttle.
    Cleaned the idle valve and also tested an other idle valve. No change. So after some reading I suspect the Lambda.
    When I start it cold, 20c. The idle is fine for about 30-50sec, then it's starting to be very nervous.. jumping from 400-800rpm. Could the Lambda cause this? Every hose is checked and exchanged if it was bad.
    If the idle valve was faulty it shouldn't be ok for the first 30-50sec I think?. It's always the same time until he idle goes crazy.
    TPS is checked and functioning.
    Spark plugs and ignition is new.
    ECU gives me no fault codes at all. Any one had a similar problem?

  • #2
    I had a very similar experience recently with poor idle - pretty much as you describe. It would jump about from 400-800 and stall if I didn't give a little throttle when warm.

    What fixed this for me was unplugging the MAF connector giving it a quick clean and then reconnecting. As soon as I fired it up after that the idle was perfect. Definitely something to check if you haven't already.

    Here's some more info that helped me.

    https://www.s2forum.com/forum/techni...nector?t=24544

    https://forums.quattroworld.com/s4s6/msgs/20442.phtml
    93 S2 Avant
    94 80 V6 Saloon

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    • #3
      Probably either MAF connector or an air leak.

      S2 Coupe 3B Project


      Ur quattro restoration

      S2 Avant

      Boost is the new rock and roll!
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      • #4
        Originally posted by newsh
        Probably either MAF connector or an air leak.
        That bloomin MAF connector!
        https://r.tapatalk.com/shareLink?sha...1&share_type=t

        S2 Coupe 3B Project


        Ur quattro restoration

        S2 Avant

        Boost is the new rock and roll!
        sigpic

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