Ur quattro hot starting problem.

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  • couperr20v
    S2Forum Fanatic
    • Sep 2015
    • 62
    • Country: United Kingdom
    #1

    Ur quattro hot starting problem.

    Hopefully someone can tell me if a crank sensor off a ann engine
    Will fit on a ur rr engine as I think this is the problem on hot start.
    It won't fire until cooled down fine from cold.
    I have a spare ann engine that I can rob one off!

    Thanks👍
    Tags: None
    • quattro-nick
      S2Forum Extremist
      • Sep 2012
      • 1746
      • Country: Belgium
      #2
      it's more likely the hall sensor in your dizzy that's bad.
      ihave made a few enigne's with ignition problems with hot engine and most off the time it is the hall sensor in the dizzy that fails
      audi coupe quattro b2 2.2 20vt project (573hp-626nm)
      TWINCHARGED power,zero lag
      AEM W/M injection

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        • quattrito
          S2Forum Maniac
          • Aug 2009
          • 739
          • Country: Latvia
          #3
          Defo it's the dizzy hall sensor making problem, like Nick said.

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            • Lago Blue
              S2Forum Maniac
              • Jul 2009
              • 843
              • Country: Canada
              #4
              Why guess when you could meter the crank sensor and know...

              This (link below) is for my '90 CQ but may be applicable. I also wonder if these sensors are the same across the range?

              Good-bye to hot start issue on the CQ... - AudiWorld Forums
              https://www.audiworld.com/forums/audi-90-80-coupe-quattro-cabriolet-22/good-bye-hot-start-issue-cq-2125753/#post18586398
              Audi 90 / 80 / Coupe quattro / Cabriolet - Good-bye to hot start issue on the CQ... - ...this progressed from a long standing no start just when really hot, to no start at all, period; on an early build '90 CQ. I had no codes. Just waiting, used to work real well! When this is happening, no spark occurs (and; perhaps...



              Last edited by Lago Blue; 13 October 2025, 00:06.

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