AEL diesel purge(flushing)

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  • Joop
    S2Forum Fanatic
    • May 2015
    • 89
    • Country: Germany

    #1

    AEL diesel purge(flushing)

    Yesterday i tried to clean the fuel pump,injection noozles the fuel system with liquid molly with the method of second picture.
    I i disconnected the fuel filter,the feeding line and the returning line.
    During the flushing i was sooooo happy even at 3000 rpm there was no any smoke
    from the exhaust.

    The red line is the feeder,the green one is the returning. I also set a small spin filter to the returning line to prevent to push it back the same dirty.


    When the liquid molly was empty i load the fuel filter and the fuel pump with diesel to prevent that air goes to the system.

    I changed the fuel filter too but when i started the engine in normal mode i became upset it is still smoke in high rpm or in 2,3 shifting mode.

    I trust in i setted up the correctly the lines but there was no any dirty in the returning line the filter was almost new and clean.However the fuel filter was replaced 10 years ago.

    I don't understand why there was not any black smoke comes out when it was working from liquid molly


    Thank you for your help
    Attached Files
  • AndyP
    S2Forum Zealot
    • Feb 2004
    • 6049
    • Country: England

    #2
    It won't smoke when you're running the flush through as the engine is not under any load, plus the liquid moly will not burn like derv does.

    Whay colour is the smoke you're getting?
    sigpic
    1991 Audi S2 3B - 2.5 Stroker engine
    1997 A6 2.5TDi quattro avant - C4
    1976 RD250E / 350LC cafe racer

    Comment

    • Joop
      S2Forum Fanatic
      • May 2015
      • 89
      • Country: Germany

      #3
      Originally posted by AndyP
      It won't smoke when you're running the flush through as the engine is not under any load, plus the liquid moly will not burn like derv does.

      Whay colour is the smoke you're getting?

      Thank you for your reply.It is a black smoke.I don't know how can i reduce the smoke now.Maybe dissassebly the injector and clean the injector noozles invidually?

      Comment

      • AndyP
        S2Forum Zealot
        • Feb 2004
        • 6049
        • Country: England

        #4
        If it's black then that over fueling. I'd check the simple things first, like is your air filter clean? Do you have access to VCDS so you can check the readings off the MAF?
        sigpic
        1991 Audi S2 3B - 2.5 Stroker engine
        1997 A6 2.5TDi quattro avant - C4
        1976 RD250E / 350LC cafe racer

        Comment

        • Pauliusb2
          S2Forum Addict
          • Dec 2014
          • 361
          • Country: United Kingdom

          #5
          Does your car have a chip?

          Comment

          • Joop
            S2Forum Fanatic
            • May 2015
            • 89
            • Country: Germany

            #6
            Hello,

            thank you all your answer i am working on to get a vcds to check the parameters.
            The car has not have chip

            Comment

            • Joop
              S2Forum Fanatic
              • May 2015
              • 89
              • Country: Germany

              #7
              It took me a while to get acces to vcds but now its ready to measure the values.What group should i check and where can i find the reference values?

              Comment

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