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  • Boost leak test

    Hi
    i need a pointer on where the bungs go so I can test the car I haven’t done it in a few years so forgotten I’ve looked for a thread but alas no luck anyone help please.

  • #2
    <3 <3
    Last edited by larsaskogstad; 1 March 2021, 21:40.
    https://www.s2forum.com/forum/member...-3b-1991-coupe

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    • #3
      Just plug the Maf hose and test from there, it will test everything then, including the PCV system. You will need to check the Diverter valve diaphragm though as you’ll be pressurising it from both sides.
      If you want to separate the PCV system then disconnect the hose in the side of the maf hose and plug the hole. If you get air coming out the cam cover pipe (or the black tube on the 3B) then your PCV valve under the IM is broken or stuck open.

      S2 Coupe 3B Project


      Ur quattro restoration

      S2 Avant

      Boost is the new rock and roll!
      sigpic

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      • #4

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        • #5
          Originally posted by newsh View Post
          Just plug the Maf hose and test from there, it will test everything then, including the PCV system. You will need to check the Diverter valve diaphragm though as you’ll be pressurising it from both sides.
          If you want to separate the PCV system then disconnect the hose in the side of the maf hose and plug the hole. If you get air coming out the cam cover pipe (or the black tube on the 3B) then your PCV valve under the IM is broken or stuck open.
          What size is the MAF hose again?

          https://www.s2forum.com/forum/member...-3b-1991-coupe

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          • #6
            Originally posted by larsaskogstad View Post

            What size is the MAF hose again?
            80mm




            S2 Coupe 3B Project


            Ur quattro restoration

            S2 Avant

            Boost is the new rock and roll!
            sigpic

            Comment


            • #7
              Thanks man
              https://www.s2forum.com/forum/member...-3b-1991-coupe

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              • #8
                Originally posted by larsaskogstad View Post
                Thanks man

                S2 Coupe 3B Project


                Ur quattro restoration

                S2 Avant

                Boost is the new rock and roll!
                sigpic

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                • #9
                  Originally posted by newsh View Post

                  And send me that white thingy no problem Ill take it.
                  https://www.s2forum.com/forum/member...-3b-1991-coupe

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                  • #10
                    Originally posted by larsaskogstad View Post

                    And send me that white thingy no problem Ill take it.
                    I may be able to get one. A forum member who lives near me had some made. I will see if he has a spare.
                    Nothelle S2 Avant
                    Black Ur project
                    Ocianic Ur project gone
                    S2 Coupe project gone
                    Urs6 plus project gone

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                    • #11
                      Would be very very nice I can send Gudbrandsdalost as payment <3
                      https://www.s2forum.com/forum/member...-3b-1991-coupe

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                      • #12
                        Originally posted by larsaskogstad View Post
                        Would be very very nice I can send Gudbrandsdalost as payment <3
                        Yum yum. I've sent him a message and he is looking
                        Nothelle S2 Avant
                        Black Ur project
                        Ocianic Ur project gone
                        S2 Coupe project gone
                        Urs6 plus project gone

                        Comment


                        • #13
                          The cheeese is good..
                          Hmm think my system should be airtight only thing im wondering about is the pcv pvc hose in the rear of the engine.
                          Rest of the system is brand new silicon hoses
                          https://www.s2forum.com/forum/member...-3b-1991-coupe

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                          • #14
                            Beware the 3B PCV hose, it will split when you pressure test (IRL it only sees vacuum)

                            It’s the hose which is a short 30-20mm ? With a long 8mm T up to the back of the cam cover. You can replace this with a silicon reducer and a T, a joiner and some hose.
                            I did make some alloy 30-20-8 adapters ages ago but all gone now.

                            S2 Coupe 3B Project


                            Ur quattro restoration

                            S2 Avant

                            Boost is the new rock and roll!
                            sigpic

                            Comment


                            • #15
                              You mean it will split because of bad quality or?

                              https://www.s2forum.com/forum/member...-3b-1991-coupe

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