surging idle

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  • R&D man
    Member
    • Mar 2010
    • 79
    #1

    surging idle

    I now have a surging idle .Th car starts fine whe it is cold.....after a few minutes it starts to surge from 500 to 1200 rpm .the car is a m50 transplanted in a e30.
    I replace the idle control vale and it seems to still do it.I had the idle set perfect after it warmed up but now this morning it is back surging ...Any thoughts

    Thanks
    Tags: None
    • 7pilot
      E30 Addict
      • Feb 2009
      • 475
      #2
      Air leak between the MAF and the intake ports.

      m

        Comment

        • nrubenstein
          No R3VLimiter
          • Feb 2009
          • 3148
          #3
          Yes, a vacuum leak is likely. Also pull codes and see if there are any other issues - like, say, knock sensors.
          2006 GMC Sierra 2500HD 4WD LBZ/Allison
          2002 BMW M3 Alpinweiß/Black
          1999 323i GTS2 Alpinweiß
          1995 M3 Dakargelb/Black           - S50B32/S6S420G/3.91
          1990 325is Brilliantrot/Tan
          1989 M3 Alpinweiß/Black

          Hers: 1996 Porsche 911 Turbo Black/Black
          Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd

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            Comment

            • R&D man
              Member
              • Mar 2010
              • 79
              #4
              codes

              I have no way of pulling codes I have the early 1986 instrument cluster as well no stmp test.

                Comment

                • Adrian_Visser
                  R3VLimited
                  • Jun 2006
                  • 2823
                  #5
                  I you wired power to pin 16 of the diagnostic connector you could hook up a peake scanner to it and pull the codes that way.

                  '89 Alpine S52 with goodies

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