Strange RPM sensor issue...

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  • MidnightBlueS2
    S2Forum Extremist
    • Jul 2005
    • 1653
    • Home: United States Current: Belgium
    #1

    Strange RPM sensor issue...

    Hello everyone !

    Here's a tricky one for the experts !

    My friend Philippe has some longtime issues with his S2 and he's asked me to ask the forum about the following... Basically, his Avant boosts fine ( MTM ECU and RS2 turbo ) and perfectly till 1.3 BAR but as soon as RPM climbs higher, his boost cuts out when he should be getting about 1.8 BAR.
    He's been told that his RPM sensor is at fault and needs to be replaced...

    Any thoughts, suggestions are very welcome !

    Thanx in advance and take care all y'all !

    David
    Midnight Blue S2 - SOLD - 1993 S2 Avant
    Tags: None
    • MidnightBlueS2
      S2Forum Extremist
      • Jul 2005
      • 1653
      • Home: United States Current: Belgium
      #2
      Anyone ?
      Midnight Blue S2 - SOLD - 1993 S2 Avant

        Comment

        • porkkis
          S2Forum Extremist
          • Aug 2003
          • 1994
          • Country: Finland
          #3
          RPM sensor code is always there if the engine hasn't been started. I have a feeling...

          Boost leak check is #1. How does the "boost cut" appear? Face-to-windshield type?
          -

            Comment

            • MidnightBlueS2
              S2Forum Extremist
              • Jul 2005
              • 1653
              • Home: United States Current: Belgium
              #4
              Originally posted by porkkis
              RPM sensor code is always there if the engine hasn't been started. I have a feeling...

              Boost leak check is #1. How does the "boost cut" appear? Face-to-windshield type?

              He's got full Samco kit with new clamps so a boost leak is unlikely... The boost cut out is very subtle, more like pulling the handbrake...
              Midnight Blue S2 - SOLD - 1993 S2 Avant

                Comment

                • S2central.net
                  Retired OG Mod
                  • Jul 2003
                  • 16590
                  • Country: Northern Ireland
                  #5
                  Sounds like failing coilpacks to me - a boost leak at WOT is usually quite a brutal event. Alternately the car could just be knocking and its the knock sensors doing their job and you feel the engine 'holding back'.

                  1.8bar boost is pretty extreme for an RS2 turbo and you would need very good fuel in my opinion for healthy running at those boost levels.

                  Paul
                  Paul Nugent
                  Webmaster http://S2central.net
                  Administrator http://S2forum.com

                  1994 S2 Coupe ABY - aka Project Lazarus
                  2001 A6 allroad 2.5TDi - family tank
                  2003 S4 Avant 4.2 V8 - daily burble

                  Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)

                  There are only 10 kinds of people that understand binary - those that do, and those that don't

                    Comment

                    • MidnightBlueS2
                      S2Forum Extremist
                      • Jul 2005
                      • 1653
                      • Home: United States Current: Belgium
                      #6
                      Originally posted by S2central.net
                      Sounds like failing coilpacks to me - a boost leak at WOT is usually quite a brutal event. Alternately the car could just be knocking and its the knock sensors doing their job and you feel the engine 'holding back'.

                      1.8bar boost is pretty extreme for an RS2 turbo and you would need very good fuel in my opinion for healthy running at those boost levels.

                      Paul
                      The coilpacks are only 3 years old but I'm not sure about the coilpack connectors

                      I'll forward your suggestion about the anti-knock sensors...

                      Thanx porkkis and Paul !
                      Midnight Blue S2 - SOLD - 1993 S2 Avant

                        Comment

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