High Idle with slight misfire

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  • newsh
    S2Forum Obsessed
    • Aug 2003
    • 16226
    • Country: United Kingdom

    #76
    Really high exhaust temps are usually caused by a lean condition. Is it possible you have a blocked fuel filter and or a bad fuel pump? (I had terrible fueling probs on my ur till I finally replaced filter and pump)

    Check for a leak between Maf and turbo. (unmetered air being drawn in)

    Check the vacuum pipe to the Fuel Pressure Regulator

    IIRC Graham on this forum had the glowing turbo syndrome when he fitted an RS2 turbo without a remap.

    S2 Coupe 3B Project


    Ur quattro restoration

    S2 Avant

    Boost is the new rock and roll!
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    • newsh
      S2Forum Obsessed
      • Aug 2003
      • 16226
      • Country: United Kingdom

      #77
      Oh, just read back a bit up the thread, the idle I believe , is stabilised when the tps closes the idle swittch, by retarding the ignition, this will make the car run even hotter and very sluggish if left shorted while driving. Did you ditch the cats yet BTW?

      S2 Coupe 3B Project


      Ur quattro restoration

      S2 Avant

      Boost is the new rock and roll!
      sigpic

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      • 220bhp
        S2Forum Fiend
        • Nov 2004
        • 2578
        • Home: United Kingdom

        #78
        The cats have been taken of and replaced with straight pipes been running that way for a couple of years. The turbo runs freely at the moment. I am waiting for another TPS to arrive. M any thanks for your help Lou

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        • 220bhp
          S2Forum Fiend
          • Nov 2004
          • 2578
          • Home: United Kingdom

          #79
          Fitted a used TPS today and gess what no red turbo ,no idel problem car dos'nt over heat, still a misfire now and again, but I think its a boost leak, I am waiting for a set of samcos so they could fix that.
          The car runs better now than its ever done, but it still feals like there is very little turbo the speedo says you are going fast but there seems to be very little thrust unlike the accel'eration in my s6 which by compar'ison quite aggressive, not sure if a 3b should feal the same.Anyway I can use the car at last. Now I must take this oppertunity to thank every one on this forum for all the help and advise I have received thank you so much. Lou l

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          • audimaniac
            S2Forum Enthusiast
            • Feb 2007
            • 152
            • Country: United Kingdom

            #80
            Check the 10amp fuse to the left of the Orange Moteur Ecu Reset fuses , i had this and it was that fuse causing my higher idle problem

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