boost problems

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  • rxl
    S2Forum Extremist
    • May 2012
    • 1913
    • Country: Germany

    #16
    Originally posted by bartolomeus
    Sure but it will take some time

    no prob i got time.. and in my city no one can do a leek test... no audi or vw center does that... so the best thing would be to have this tool for myself... the hoses are not geting newer with the time..

    today cleand maf and other contacts but no use... stil 0,5-0,6 bar...

    Comment

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

      #17
      Originally posted by rxl
      ...today cleand maf and other contacts but no use... stil 0,5-0,6 bar...
      Boost leak testing is something that you can do yourself (maybe with the help of a friend with a compressor).

      As for the 0.5 to 0.6 Bar boost, that is just wastegate spring-based mechanic boost pressure which sounds suspiciously like the ECU is not getting the boost pressure signal at the MAP sensor in the ECU and therefore is not controlling the wastegate frequency valve. My suggestion is to check the lime green plastic line from the back of the intake manifold to the ECU. In addition, there is likely a "T" near the intake manifold and if it is broken, you might not be getting the proper pressure/vacuum at the fuel pressure regulator.

      Moisture Trap info:
      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


      MAP sensor info:
      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


      Wastegate Frequency Valve info:
      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


      Fuel Pressure Regulator info:


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

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      • rxl
        S2Forum Extremist
        • May 2012
        • 1913
        • Country: Germany

        #18
        today disconected the mfts and drove a little.. is it normal that i get fuel cut at 0,3 bar boost?

        Comment

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

          #19
          Originally posted by rxl
          today disconected the mfts and drove a little.. is it normal that i get fuel cut at 0,3 bar boost?
          Follow the ABY/ADU hyperlinks in this F76 MFTS info post:

          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

          • rxl
            S2Forum Extremist
            • May 2012
            • 1913
            • Country: Germany

            #20
            today i was at audi... and wanted to buy a few parst for my s2... and asked what would a hose from n75 to wastgate would cost... WTF??? 70euros.... cant believe it myself ...

            Comment

            • rxl
              S2Forum Extremist
              • May 2012
              • 1913
              • Country: Germany

              #21
              today sprayed all the contacts with contact cleaner, changed the n75 to a new one, changed the moisture trap and yeaehhhhh got 0,7 bar boost with standard ecu and with chiped one 0,9 bar boost... i think there is a boost leek somethere thow..

              Comment

              • bartolomeus
                S2Forum Extremist
                • Jan 2009
                • 1475
                • Country: Romania

                #22
                Originally posted by rxl
                today sprayed all the contacts with contact cleaner, changed the n75 to a new one, changed the moisture trap and yeaehhhhh got 0,7 bar boost with standard ecu and with chiped one 0,9 bar boost... i think there is a boost leek somethere thow..
                You will find out soon if you have a boost leak

                Comment

                • rxl
                  S2Forum Extremist
                  • May 2012
                  • 1913
                  • Country: Germany

                  #23
                  Originally posted by bartolomeus
                  You will find out soon if you have a boost leak
                  cant wait to test it

                  Comment

                  • rxl
                    S2Forum Extremist
                    • May 2012
                    • 1913
                    • Country: Germany

                    #24
                    today is my wifes birthday but why im geting all the present????
                    and special thanks to forum member bartolomeus its always a pleasure doing business with u
                    Attached Files

                    Comment

                    • bartolomeus
                      S2Forum Extremist
                      • Jan 2009
                      • 1475
                      • Country: Romania

                      #25

                      I hope you'll fix your problem soon.

                      Comment

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