Cutting out but not all the time?

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  • Knight Rider S4
    S2Forum Possessed
    • Mar 2005
    • 3541
    • Country: Scotland

    #1

    Cutting out but not all the time?

    Little trivia guys ..After fitting new lambda, Samco pipes and timing belt to dm80 car it has developed a problem with cutting out (when slowing down for junctions or coming off the throttle to stop)..It does not happen all the time as the past few days it has not reappeared …very strange ?....I have had a look over it and when I last checked it ,one of the hose clips had come loose slightly beside the DV so tighten this up and took for a run to try and create the same thing but was all fine

    As in general I would say it is running fecking great it goes like a scalded cat ,It hits 1.3bar no problem now as before it did not (boost leak)..The drive is smooth ..no faults there at all

    The car is a S2 3B with a MRC remap

    When it starts up it idles fine from cold straight threw to hot ….

    When I first went to see the car, the first thing that was in my mind was boost leek as it sounded like it was drawing air when shutting off the throttle and fuel mixture was weak and making it cut out …but all hoses new and tight seal now

    So what is your thoughts guys ..quite a hard one to pin down as it is not happening all the time ..The ISV is the first thing to check I suppose but since this has only occurred after fitting the above, and find it hard to think this would affect it only at this point(when shutting off throttle when underload) as it works all the other times

    Would a faulty Lambda probe cause this?

    Another thing as the car was not running to its full potential before do think this has created this problem when operating at its best ?


    Any other ideas greatly recieved

    Cheers

    Steve
    Last edited by Knight Rider S4; 21 July 2008, 13:12.
    93 S2 Avant Parting
    91 URQ RR
    02 A4 tdi Avant
  • s2avant
    S2Forum Fiend
    • Jul 2003
    • 2426

    #2
    My ABY Avant did exactly the same thing up until last week. It would sporadically decide it wasn't going to idle.

    I cleared the fault codes and worked the throttle back and forth a few times to make sure it was hitting the correct idle switch position etc and touch wood it hasn't cut out since.

    Ben
    the best intentions are fraught with disappointment - gil grissom

    sigpic
    1994 ABY Avant - it's getting there

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    • Knight Rider S4
      S2Forum Possessed
      • Mar 2005
      • 3541
      • Country: Scotland

      #3
      Oh and there is no fault codes coming up via vag.com
      93 S2 Avant Parting
      91 URQ RR
      02 A4 tdi Avant

      Comment

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

        #4
        You did remember to plug the ISV back in, right?
        RS2'd 93 UrS4 5 spd sedan
        94 UrS4 V8 6 spd manual avant

        Comment

        • Knight Rider S4
          S2Forum Possessed
          • Mar 2005
          • 3541
          • Country: Scotland

          #5
          ISV has not been touched
          93 S2 Avant Parting
          91 URQ RR
          02 A4 tdi Avant

          Comment

          • sjw185
            S2Forum Extremist
            • Jun 2007
            • 1175
            • Country: Scotland

            #6
            My 3b did the same thing
            Got new samcos on and cleaned out the ISV
            Sure there was a thread that said cone filters caused it so fitted a air box and it seems to have cured it?
            What about the vac lines?

            Cheers

            Comment

            • Knight Rider S4
              S2Forum Possessed
              • Mar 2005
              • 3541
              • Country: Scotland

              #7
              Have checked the vac lines they are ok ...has a standard airbox on .....will take off the ISV and give it a clean out and see if that helps...just very strange as it only happens now and again by the looks of it (intermittent fault )
              93 S2 Avant Parting
              91 URQ RR
              02 A4 tdi Avant

              Comment

              • quattro20v
                S2Forum Enthusiast
                • Jul 2007
                • 173
                • Country: Finland

                #8
                Bypass?
                Now quattro less, my urs4 stolen 13.8

                Comment

                • Knight Rider S4
                  S2Forum Possessed
                  • Mar 2005
                  • 3541
                  • Country: Scotland

                  #9
                  Originally posted by quattro20v
                  Bypass?
                  Do you mean Diverter Valve?
                  93 S2 Avant Parting
                  91 URQ RR
                  02 A4 tdi Avant

                  Comment

                  • A80Avant
                    S2Forum Obsessed
                    • Sep 2005
                    • 10873
                    • Country: Greece

                    #10
                    could this be a timing problem?

                    Comment

                    • K7ERG
                      S2Forum Extremist
                      • Mar 2004
                      • 1711
                      • Country: Scotland

                      #11
                      ICV i would say get this on the Vauxhalls with the similar ICV. Clean it out see if it helps.

                      I have 2 if you need to replace to rule out ICV.

                      Also you have changed the pipe work to Samco. Could there have been some oil/dirt in there which has been disturbed and pushed into the ICV???

                      Just a idea.
                      Audi A6 AEL 5cyl Quattro breaking.
                      Audi A5 3.0tdi Quattro Stage 2
                      07947385043

                      Comment

                      • Knight Rider S4
                        S2Forum Possessed
                        • Mar 2005
                        • 3541
                        • Country: Scotland

                        #12
                        Originally posted by K7ERG
                        ICV i would say get this on the Vauxhalls with the similar ICV. Clean it out see if it helps.

                        I have 2 if you need to replace to rule out ICV.

                        Also you have changed the pipe work to Samco. Could there have been some oil/dirt in there which has been disturbed and pushed into the ICV???

                        Just a idea.

                        Yeah might pop up and get one of you Craig..That is my next bet


                        Originally posted by PapVas
                        could this be a timing problem?
                        No as this was spot on before i put back together..(triple checked)
                        93 S2 Avant Parting
                        91 URQ RR
                        02 A4 tdi Avant

                        Comment

                        • K7ERG
                          S2Forum Extremist
                          • Mar 2004
                          • 1711
                          • Country: Scotland

                          #13
                          No probs steve i am off to Friday night.

                          Audi A6 AEL 5cyl Quattro breaking.
                          Audi A5 3.0tdi Quattro Stage 2
                          07947385043

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