Trouble with 3B S2

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  • S2Race
    S2Forum Buff
    • Apr 2008
    • 25
    • Country: Iceland
    #1

    Trouble with 3B S2

    Hello there!

    My name is Simon and I live in Iceland, this would be my first post on this forum

    I have a 1991 S2 coupe, I have been tuning it and got it up and running but shortly after I started it (drove about 400 km) the car started to act weird!
    I was overtaking a car, geared down to 3rd gear and went to about 7000 rpm, right after that the car seemed to go to limp mode, decided to stop by the side of the road but there the car died and wouldn't start again...
    Got it home and now it is like that that it doesn't start but it is possible to tow it and get it running, but it only runs when I keep it over 1000 rpm
    I have tried to put in a hall sender from another car and also tried my ECU in the other car, everything is timed right in and works OVER 1000 rpm, except that it is in limp mode
    I also tried to replace G4 and G28 (sensors on flywheel) but didn't work.
    When the ECU is plugged to a diagnostic computer it brings up G4 or G28 when I just try to start it up but if I tow it and it is running it shows G40 (hall sender)

    I somehow feel like I have tried everything!! Any new ideas??

    Thanks, Simon...
    Audi S2 ArcticTuning
    11,800 @ 115mph @ 1,8bar
    Tags: None
    • 4WheelDrifter
      S2Forum Zealot
      • Oct 2004
      • 5773
      • Country: Devon
      #2
      Check the basic timing marks on the engine. The cambelt may have jumped.
      SS

        Comment

        • S2Race
          S2Forum Buff
          • Apr 2008
          • 25
          • Country: Iceland
          #3
          @4WheelDrifter

          Have already done that, everything is on time, camshafts, damper-wheel and flywheel...
          Audi S2 ArcticTuning
          11,800 @ 115mph @ 1,8bar

            Comment

            • ifa
              S2Forum Fanatic
              • Apr 2005
              • 57
              • Country: Finland
              #4
              Distributor gear damaged or its basic setting is wrong.

                Comment

                • S2central.net
                  Retired OG Mod
                  • Jul 2003
                  • 16590
                  • Country: Northern Ireland
                  #5
                  Check the reference timing pin is still in the flywheel... And if you have access to a scope that you see a pulse from that pin every crank rotation at 62 deg BTDC... On every other rotation, the crank reference pulse must arrive within the camshaft (hall sensor) pulse.
                  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

                    • S2Race
                      S2Forum Buff
                      • Apr 2008
                      • 25
                      • Country: Iceland
                      #6
                      I putted a metal distributor gear in and it's timed right in.

                      I thought of the pin this weekend but didn't have time to check it out, so I will do it next weekend...
                      I just don't have a scope

                      Has anyone else had it it like that the car only runs over 1000 rpm? Is there a sensor or something that keeps the car running at idle and under 1000 rpm but isn't doing anything over 1000 rpm!?
                      Audi S2 ArcticTuning
                      11,800 @ 115mph @ 1,8bar

                        Comment

                        • Markarina
                          S2Forum Maniac
                          • Mar 2006
                          • 511
                          • Home: United Kingdom Current: Switzerland
                          #7
                          could it be anything to do with the ISV, if that's not working then when you lift off the rpm just falls down to zero, I've had a similar issue with my 3B

                            Comment

                            • S2Race
                              S2Forum Buff
                              • Apr 2008
                              • 25
                              • Country: Iceland
                              #8
                              Tried to put in a ISV from another car, didn't change anything...
                              Audi S2 ArcticTuning
                              11,800 @ 115mph @ 1,8bar

                                Comment

                                • S2Race
                                  S2Forum Buff
                                  • Apr 2008
                                  • 25
                                  • Country: Iceland
                                  #9
                                  Up and running again

                                  The pin in the flywheel was broken! We had some guys resurfacing the flywheel when we replaced the clutch, and to do that they had to take out all the pins on the clutch side, the long pins (which don't have any obvious purpose to me ) broke so they had to put in new ones, one of them had fallen out and managed to break the pin for the sensor

                                  Should have checked that earlier...

                                  Thanks for the comments

                                  Best regards...
                                  Audi S2 ArcticTuning
                                  11,800 @ 115mph @ 1,8bar

                                    Comment

                                    • Fat Audi 80
                                      Super Moderator
                                      • Jan 2004
                                      • 10547
                                      • Country: England
                                      #10
                                      Glad you have sorted it out!

                                      to the Forum!

                                      Cheers,

                                      Steve.
                                      The Perfectionist
                                      sigpic
                                      Audi Class Concours winner Stoner Park 2014, ADI Concours D'Elegance Class Winner 2008, Runner up 2014. Winner, S2Forum Show'n'Shine Billing 2006 & 2008.

                                        Comment

                                        • S2central.net
                                          Retired OG Mod
                                          • Jul 2003
                                          • 16590
                                          • Country: Northern Ireland
                                          #11
                                          I love it when I'm right 1st time ... Not easy in the world of remote S2 diagnostics

                                          Good to hear its sorted though...
                                          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

                                            • S2Race
                                              S2Forum Buff
                                              • Apr 2008
                                              • 25
                                              • Country: Iceland
                                              #12
                                              But can someone tell me why the two long pins are on the clutch side? Do they have a purpose in some other cars with same flywheel or something?
                                              Audi S2 ArcticTuning
                                              11,800 @ 115mph @ 1,8bar

                                                Comment

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