AAN Stumble at 23lbs

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  • S6Sputnik
    S2Forum Buff
    • Nov 2006
    • 37
    • Home: Denmark Current: United States
    #1

    AAN Stumble at 23lbs

    I cannot find a boost leak and we have used the smoke method. So now I am looking for most likely other suspects...
    It is not random so I feel like I am missing something...boost builds without a stumble until 23ish lbs and then it stumbles, and the gauge is fluttering ...to me it would seem like a ripped hose but they are all samco silicone hoses and the clamps are on tight.
    Could it be the O2 sensor that is bad, bad plug or bad ignition wires?

    Any thoughts?
    Last edited by S6Sputnik; 28 March 2011, 15:47.
    Shawn Olsen Austin TX ACNA#1616
    //95 S6 RS2// 13 A6 3.0 // 12 S4 MT // 12 GTI apr
    Tags: None
    • UrS4boy
      S2Forum Obsessed
      • Feb 2006
      • 11859
      • Country: Canada
      #2
      AAN Missing and Hesitation Diagnostic link

      Originally posted by S6Sputnik
      I cannot find a boost leak and we have used the smoke method. So now I am looking for most likely other suspects...
      It is not random so I feel like I am missing something...boost builds without a stumble until 23ish lbs and then it stumbles, and the gauge is fluttering ...to mee it would seem like a ripped hose but they are all samco silicone hoses and the clamps ar on tight. Could it be the O2 sensor that is bad, bad plug or bad ignition wires?
      Any thoughts?
      Weak coil or bad plug or bad plug boot. (There are no "wires" unless you are running an aftermarket system). Have a look at this missing and hesitation diagnostic post:

      quattroworld.com Forums: One missing and hestitation diagnostic procedure
      http://forums.quattroworld.com/s4s6/msgs/22611.phtml
      The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums


      Part of a more comprehensive AAN ignition post:

      quattroworld.com Forums: AAN ignition coil info including POS and Cam Sensor info and Diagnostics
      http://forums.quattroworld.com/s4s6/msgs/4088.phtml
      The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
      RS2'd 93 UrS4 5 spd sedan
      94 UrS4 V8 6 spd manual avant

        Comment

        • S6Sputnik
          S2Forum Buff
          • Nov 2006
          • 37
          • Home: Denmark Current: United States
          #3
          Great info, I did get code for an injector two weeks ago! And yes it has coils not ignition wires... I was for a brief second back in my 3B 200q20v avant where I had a similar problem caused by a bad wire
          Last edited by S6Sputnik; 28 March 2011, 15:50.
          Shawn Olsen Austin TX ACNA#1616
          //95 S6 RS2// 13 A6 3.0 // 12 S4 MT // 12 GTI apr

            Comment

            • UrS4boy
              S2Forum Obsessed
              • Feb 2006
              • 11859
              • Country: Canada
              #4
              Originally posted by S6Sputnik
              Great info, I did get code for an injector two weeks ago! And yes it has coils not ignition wires... I was for a brief second back in my 3B 200q20v avant where I had a similar problem caused by a bad wire
              Well, if you got an injector code previously, the answer is "It could be an injector", in which case you might want to have your injectors cleaned and "blueprinted" professionally.

              Here is some 20VT fuel injector info (might or might not help):

              quattroworld.com Forums: OE 20VT Fuel Injector Info (with link to Fuel Pressure Regulator info)
              http://forums.quattroworld.com/s4s6/msgs/20441.phtml
              The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
              RS2'd 93 UrS4 5 spd sedan
              94 UrS4 V8 6 spd manual avant

                Comment

                • DamianURS4
                  S2Forum Addict
                  • May 2010
                  • 406
                  • Country: United Kingdom
                  #5
                  sounds coil-ish....

                    Comment

                    • S6Sputnik
                      S2Forum Buff
                      • Nov 2006
                      • 37
                      • Home: Denmark Current: United States
                      #6
                      Originally posted by DamianURS4
                      sounds coil-ish....
                      Wouldn't I feel that all the time though ?
                      Shawn Olsen Austin TX ACNA#1616
                      //95 S6 RS2// 13 A6 3.0 // 12 S4 MT // 12 GTI apr

                        Comment

                        • prj
                          S2Forum Zealot
                          • Mar 2010
                          • 6308
                          • Country: Estonia
                          #7
                          23 psi?
                          What are you running?
                          http://tuner.ee - http://www.facebook.com/tuner.ee

                            Comment

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