RS2 Hesitation

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  • herald
    S2Forum Fanatic
    • Apr 2011
    • 76
    • Country: United Kingdom

    #1

    RS2 Hesitation

    My RS2 that I bought in April suffers from a persistent hesitation and I still can't cure it. So far we have replaced in the last 6 months the air mass meter, the spark plugs, the cam belt and fuel filter. We have also checked and cleaned several earthing points and sorted a host of electrical issues. The entire inlet tract and throttle body has been cleaned. It's had a whole heap of unrelated parts replaced too.

    The hesitation occurs at low revs, light throttle and is mostly there but not always. At full chat it behaves like I think it should ie it goes like hell. It runs super unleaded and has done 4000 miles since April with no real change in symptoms. We are now simply guessing what to replace next. Any further suggestions for how to diagnose would be very very welcome. No faults show on diagnostics.
  • Ross
    S2Forum Possessed
    • Aug 2005
    • 3399
    • Country: England

    #2
    Have you boost leak checked it and pulled fault codes? That should be your next step.
    AUDI - saving Dad's from minivans since 1994

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    • herald
      S2Forum Fanatic
      • Apr 2011
      • 76
      • Country: United Kingdom

      #3
      Thanks for the reply. We have checked the fault codes, several times, and none are there. We haven't boost leak checked it, mainly because it is a low revs issue. It happens at around the 1500-2500 revs.

      How do we check please?

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      • steverrquattro
        S2Forum Maniac
        • Oct 2006
        • 787
        • Country: England

        #4
        I've had a similar issue and mine turned out to be the ISV valve.
        Steve

        1990 RR 20V
        1982 SWB UR - RS2 Engine

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        • Al Wyn
          S2Forum Possessed
          • Nov 2006
          • 3746
          • Country: United Kingdom

          #5
          With all the other bits you mentioned done id put my money on the ISV
          S2 + RS2 yep ive had a few love em... Laser red S2 avant... Brilliant black lhd RS2... Polar silver RS2... RS blau RS2... CheeRS Al

          Comment

          • herald
            S2Forum Fanatic
            • Apr 2011
            • 76
            • Country: United Kingdom

            #6
            Yeah! Found it. Lambda Probe. ISV disconnected altered it, but didn't cure it. Changed the lambda and bingo, near perfect as it will ever be. Thanks for every suggestion as they all made me think and try things.

            Comment

            • macspring
              S2Forum Zealot
              • Mar 2005
              • 6371
              • Home: Ireland Current: Wallis & Futuna

              #7
              Thanks for posting the cure to round off the thread, for info now and the future reference of others.


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