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  • rs2 cold start trouble

    hi ,
    first, i apologize for my poor english ;-)
    here is my problem :
    since a few weeks , at cold start , my engine tumble ant stops , and when i WOT it stays at low revs , and some exhaust and intake explosions occur .....
    at iddle it seems to run on 4 cylinders ..
    and after a few time (5 minutes) it sudenly run fine.
    the are 5 new plugs on it .

    thanks for your help

  • #2
    Has it been sat for a long time? Any signs of damp in connectors and sensors? Have you pulled fault codes?
    Greg

    S2Forum.com Administrator & Webmaster

    '93 Coupe with a few tweeks

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    • #3
      i' haven't a diag system .
      The car is runing every week or starting at least every month on cold season

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      • #4
        Check the wiring plug to the white sensor on the back of the cylinder head. The ECU uses this sensor for coolant temp. Maybe it gives a false reading during warm up.

        S2 Coupe 3B Project


        Ur quattro restoration

        S2 Avant

        Boost is the new rock and roll!
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        • #5
          I had similar symptoms with my S2 ABY and it turned out to be this.
          1996 S2 ABY Coupe silver
          2003 S3 8L dolphin grey
          2014 RS4 B8 prism silver

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          • #6
            the wiring seems to be ok , so i disconnect the sensor , and it runs fine....
            So , is this critical to run without this, sensor , while i will found a new one ?

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            • #7
              thanks for the help guys !!!

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              • #8
                I offer you the following:

                Missing and Hesitation diagnostics:

                http://forums.quattroworld.com/s4s6/msgs/22611.phtml

                Power Output Stage Diagnostics:

                http://forums.quattroworld.com/s4s6/msgs/153152.phtml

                G62 Coolant Temp Sender used by the ECU to control fuelling:

                http://forums.quattroworld.com/s4s6/msgs/20985.phtml

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

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                • #9
                  I dont want to make new topic. My car makes also same but has 3B engine. What sensor it can be. If engine is gold then rpm goes between 400-1000rpm. About a minute it will be steady.
                  What would be normal rpm with cold engine? Mines always been 800rpm. Cold or warm.
                  Also RPM-s will go crasy if i will stop before stop sine and then it will also do like it was gold engine. But after 20 minutes of ride, everything goes ok.

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                  • #10
                    Check out your idle stabilizer valve to make sure it’s moving freely. You can run output tests with a simple blink code lead yourself. If not check the temp sensors as listed above
                    Greg

                    S2Forum.com Administrator & Webmaster

                    '93 Coupe with a few tweeks

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                    • #11
                      Originally posted by Greg_S View Post
                      Check out your idle stabilizer valve to make sure it’s moving freely. You can run output tests with a simple blink code lead yourself. If not check the temp sensors as listed above
                      Does those things you mentioned also make engine stutter? I today started car and it looks like only 3-4 cylinders work. revs jumped 300-1000rpm. After 10 minutes of ride and car was perfect again.

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                      • #12
                        finaly that wasn't the temp sensor ... i disconnect the blue connector on the bipass on the oil gaz recirculating circuit ... this is located near the ECU temp sensor ...

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                        • #13
                          Originally posted by ristokru View Post

                          Does those things you mentioned also make engine stutter? I today started car and it looks like only 3-4 cylinders work. revs jumped 300-1000rpm. After 10 minutes of ride and car was perfect again.
                          Anyone?

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                          • #14
                            this symptoms are nearly the same as mine, disconnect the blue connector on the oil vapor recyrculating circuit, under the throtle bodie .
                            just for test , if its this your engine may run fine just when you disconnect this

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                            • #15
                              Originally posted by bout1977 View Post
                              this symptoms are nearly the same as mine, disconnect the blue connector on the oil vapor recyrculating circuit, under the throtle bodie .
                              just for test , if its this your engine may run fine just when you disconnect this
                              I have 3B engine. Its little different.

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