Rough/Misfire when warm

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  • BrianSmith_S2
    S2Forum Extremist
    • Jun 2005
    • 1342
    • Home: Northern Ireland Current: British Antarctic Territory

    #1

    Rough/Misfire when warm

    As title says my S2 Aby runs as if on 4 cylinders when warmed up.
    During warm up cycle she runs smooth and holds boost and pulls strong, but after reaching temperature for the cooling fan to cut in she sometimes begins to run rough as if on 4 cylinders.
    Ive searched the forum and the usual culprits are coilpacks, pos, connectors and injectors.
    I recently renewed the coilpacks, and plugs. The plug on cyclinder 4 was very wet with fuel. Going to check out the pos connections tomorrow and fault codes.
    Is there anyone in the hampshire area that might have a spare POS i could try out?

    Brian
  • UrS4boy
    S2Forum Obsessed
    • Feb 2006
    • 11859
    • Country: Canada

    #2
    Improved POS diagnostic and fix info

    I think you will want to read and act on the info in this post (linked below). If it is POS channel 4 (and it sounds like it is), you might be able to use the spare channel on that 4-5 POS.

    The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums


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

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    • BrianSmith_S2
      S2Forum Extremist
      • Jun 2005
      • 1342
      • Home: Northern Ireland Current: British Antarctic Territory

      #3
      Just an update - 2 new POS units and shes all sorted now.

      Had borrowed a POS unit from bertman to fault find and discovered one of the units had failed from old age.

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