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  • #1

    EVAP, is this normal?

    I have been looking at most of the engine functions in my quest to sort out all of the small niggles before mapping it.

    Noticed that the car is running rich, "long time" lambda adaption (field 9) was at 135 in Group 000 in VCDS (should be close to 128).
    Cleared that (pulled ECU fuses) and fuel consumption went down as of now.

    However, the Group 009 field 3 seemed a bit weird being steady at 0 when car was at hot idle.
    I believe this is the measurement of the solenoid on PCV system.

    Should I troubleshoot this and how in that case?
    I've done output tests and the solenoid clicks.
    Not sure how else to test it?
    I tried searching the forums and most posts was about how to remove it.


    I attached a picture from S2Central that I think is telling me that something is wrong.
    You do not have permission to view this gallery.
    This gallery has 1 photos.
    Audi S2 -1994 | 480 Hp 650 Nm | FlexFuel | MaxxECU | 3" Stainless | Porsche GT3 Front Brakes
    http://www.garaget.org/?car=52877
    Tags: None
  • #2
    I am under the impression that the evap valve is not meant to operate during idle when mixture needs to be perfect, but in situations such as overrun. Maybe that's when you are meant to see that fluctuation ? Not sure

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    • #3
      That could be the case Vas.
      It doesn't throw a fault code for me.
      When I put my hand on it I thought I could feel it operate but that might just as well be some other vibration transfered to it.

      I've tried to Google the N80 valve and also looked at Daves summary at quattroworld(?) and I still don't understand how it is meant to operate.

      Could be that I'm chasing a red herring.

      Skickat från min Nexus 6P via Tapatalk

      Audi S2 -1994 | 480 Hp 650 Nm | FlexFuel | MaxxECU | 3" Stainless | Porsche GT3 Front Brakes
      http://www.garaget.org/?car=52877

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      • #4
        In vems I had this operate from 7000rpm down to 1500 on overrun only. That was the most ideal situation it could act when I discussed it with Marc at efiexpress

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        • #5

          That is a good tip for when I go with a standalone ECU, will keep that in mind.


          Found some information on S2Central.com, quoted below.
          I need to do a new VCDS session and make sure that I have not entered Group 000 & Group 001 when looking at the EVAP I guess and see if it makes any difference.
          I don't have a MIL bulb unfortunately.


          Originally posted by S2Central.com
          Talking of 'basic settings'... It took a while to discover some subtle yet important difference with respect to monitoring basic settings as opposed to measuring blocks which looks the same at first sight. Basic settings are used at warm-idle as a template for the overall health of the engine - as per the table below. Obviously the 3B only supports Group 000, but Group 001 is also provided on the basic settings screen with the ABY engine (also true for AAN & ADU). Importantly, in basic settings mode, the ECU disables the activated charcoal filter solenoid (EVAP) to ensure that mixture readings are not influenced by it's operation. Another little known fact is that the MIL bulb is illuminated whilst the basic settings mode is engaged.

          The MIL bulb remains off and the EVAP solenoid is active when in the measuring blocks screen. Trivial but important when trying to fault-find...
          Audi S2 -1994 | 480 Hp 650 Nm | FlexFuel | MaxxECU | 3" Stainless | Porsche GT3 Front Brakes
          http://www.garaget.org/?car=52877

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          • #6
            If you need a new valve they are NLA from Audi but priced at approx £140 better find second hand anyway

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            • #7
              Thanks for the tip Rikki.
              If the valve is shot I'll try to source a new one if possible at all.
              Bigger cost now but hopefully trouble free for a long time.... with emphasis on hopefully.
              Audi S2 -1994 | 480 Hp 650 Nm | FlexFuel | MaxxECU | 3" Stainless | Porsche GT3 Front Brakes
              http://www.garaget.org/?car=52877

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              • #8
                Originally posted by Rikki Kitto View Post
                If you need a new valve they are NLA from Audi but priced at approx £140 better find second hand anyway
                Just use a newer style valve & change the electrical connector.
                "Nulla tenaci invia est via"

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                • #9
                  Do you have any part number for new type of valve and connector?
                  Or a model/engine series it is used on?
                  Audi S2 -1994 | 480 Hp 650 Nm | FlexFuel | MaxxECU | 3" Stainless | Porsche GT3 Front Brakes
                  http://www.garaget.org/?car=52877

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                  • #10
                    Did another scan yesterday.

                    Now I saw some values after a while.
                    Started at 0 and then changed after ~1 min, not a rapid fluctuation but maybe changed value every 30th-60th second.
                    So I guess it is OK.

                    All other values seems to be within spec except Engine Load which is hovering at ~40% [should be 26-35% at idle] and Injector on TIme at 1.5 ms [should be 1 - 1.3 at idle].

                    Is it any reason for concern?



                    Here's Group 9, field 3 shows N80.


                    You do not have permission to view this gallery.
                    This gallery has 1 photos.
                    Audi S2 -1994 | 480 Hp 650 Nm | FlexFuel | MaxxECU | 3" Stainless | Porsche GT3 Front Brakes
                    http://www.garaget.org/?car=52877

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                    • #11
                      Originally posted by k.alle View Post
                      I've tried to Google the N80 valve and also looked at Daves summary at quattroworld(?) and I still don't understand how it is meant to operate.
                      Gee, I thought the N80 information that I consolidated was very clear.

                      REF: http://forums.quattroworld.com/s4s6/msgs/21014.phtml



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

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