Sudden surging

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  • mjposner
    Advanced Member
    • Aug 2015
    • 169

    #1

    Sudden surging

    Thursday I replaced air filter and spark plugs, drove 50 miles on friday, no issues. This a.m. I go to drive and I am getting a small 200 rpm idle surge. No loose hoses, any ideas?
  • MrBurgundy
    R3V Elite
    • Mar 2012
    • 5301

    #2
    You may have cracked the intake boot while taking off the filter. Get some brake cleaner and spray around the intake to see if a vacuum leak is the cause.
    Current Collection: 1990 325is // 1987 325i Vert // 2003 525i 5spd // 1985 380SL // 1992 Ranger 5spd // 2005 Avalanche // 2024 Honda Grom SP // 2024 Yamaha XSR700 // 2024 Jeep Gladiator Rubicon

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    • mjposner
      Advanced Member
      • Aug 2015
      • 169

      #3
      good thought, it was very stiff and hard to reattach.

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      • mjposner
        Advanced Member
        • Aug 2015
        • 169

        #4
        Also, no clamp between intake tube and suction tube.

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        • mjposner
          Advanced Member
          • Aug 2015
          • 169

          #5
          Took air box out and then added a rubber boot/clamp between suction tube and intake boot. Still seems to surge 3 or 4 times between 600-800 rpm then settles down at about 700.

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          • 7pilot
            E30 Addict
            • Feb 2009
            • 475

            #6
            The ICV may need a cleaning and some lubricant e.g., Triflow.

            m

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