Doesnt idle

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  • nip
    S2Forum Extremist
    • Apr 2006
    • 1786
    • Home: United Kingdom Current: Abu Dhabi

    #1

    Doesnt idle

    I tryed to start it yesterday it fires up then cuts straight off, if i start it and keep the revs up its fine, but if i try to start it plainly of the key it wont start.
    Any ideas im all ,
    btw ive havnt got vagcom
    cheers in advance
  • DJones
    S2Forum Fiend
    • Jun 2005
    • 2020
    • Country: United Kingdom

    #2
    Have a look at your idle stabilisation valve, check it has not come unplugged failing that remove a hose and check that the spindle inside is free, they do get sticky.

    Hope it helps..

    Comment

    • prj
      S2Forum Zealot
      • Mar 2010
      • 6308
      • Country: Estonia

      #3
      Vacuum leak.

      Pressure test + pull codes.

      And yes, sticky ISV can cause this too, as said above.
      http://tuner.ee - http://www.facebook.com/tuner.ee

      Comment

      • nip
        S2Forum Extremist
        • Apr 2006
        • 1786
        • Home: United Kingdom Current: Abu Dhabi

        #4
        Originally posted by DJones
        Have a look at your idle stabilisation valve, check it has not come unplugged failing that remove a hose and check that the spindle inside is free, they do get sticky.

        Hope it helps..
        Cheers il try that later

        Comment

        • nip
          S2Forum Extremist
          • Apr 2006
          • 1786
          • Home: United Kingdom Current: Abu Dhabi

          #5
          Originally posted by prj
          Vacuum leak.

          Pressure test + pull codes.

          And yes, sticky ISV can cause this too, as said above.
          cheers dmitri i can pressure test it but have nothing to pull codes with

          Comment

          • Thuppu
            S2Forum Freak
            • Sep 2010
            • 4115
            • Country: Finland

            #6
            ISV and afterrun pump connectors are mixed..?

            Audi UrS4 Avant 2.5 20vt - twincharged - Project
            Audi 80q B4 Sedan 2.2 20vt - Daily user
            BMW 320d Touring e91 M-Sport - Daily user
            BMW 740iA e38 - Project

            Comment

            • nip
              S2Forum Extremist
              • Apr 2006
              • 1786
              • Home: United Kingdom Current: Abu Dhabi

              #7
              Fixed!!! cheers lads it was the idle stabelizer needed cleaning

              Comment

              • UrS4boy
                S2Forum Obsessed
                • Feb 2006
                • 11859
                • Country: Canada

                #8
                N71 Idle Speed Stabilization Valve (ISV or ISS Valve) Info

                Originally posted by nip
                I tryed to start it yesterday it fires up then cuts straight off, if i start it and keep the revs up its fine, but if i try to start it plainly of the key it wont start. Any ideas?
                Sorry I missed this post yesterday. If I had I would have suggested that almost all idling problems are due to a dirty or disconnected N71 Idle Speed Stabilization Valve (ISV) and then I would have sent you to investigate this by clicking on the N71 ISV label in this diagram (all the other labels are hot links as well). Glad you found and cured your problem.

                RS2'd 93 UrS4 5 spd sedan
                94 UrS4 V8 6 spd manual avant

                Comment

                • nip
                  S2Forum Extremist
                  • Apr 2006
                  • 1786
                  • Home: United Kingdom Current: Abu Dhabi

                  #9
                  Originally posted by UrS4boy
                  Sorry I missed this post yesterday. If I had I would have suggested that almost all idling problems are due to a dirty or disconnected N71 Idle Speed Stabilization Valve (ISV) and then I would have sent you to investigate this by clicking on the N71 ISV label in this diagram (all the other labels are hot links as well). Glad you found and cured your problem.

                  http://members.shaw.ca/speedtek/UrS%...ice%20Map.html
                  cheers

                  Comment

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