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Early 325e ICV (Two-Prong) Question

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    #1

    Early 325e ICV (Two-Prong) Question

    Hi Guys,

    I've been trying to diagnose an idle problem in my '85 325e that started last week. I have been going through jlevie's excellent write up of potential problems (http://forums.bimmerforums.com/forum...rging-idle-e30) in order to diagnose the issue.

    Having checked for intake leaks and cleaned the ICV to no avail, I'm trying to check the resistance of the ICV. However, I have an old two-prong ICV (I believe only the '84-'85's had these), and I can't figure out what resistance these two-prongers are supposed to have. Mine seems to be 10-12 Ohms with ignition off (jumps around when ignition on) - anyone know if this falls into spec? Penguin has a good breakdown of this, but it's for three-prong valves, it seems.

    Thanks!
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    #2
    Bentley states 9-10 Ohms at 73 deg F. Have you followed the test procedure for the valve in there?

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      #3
      Bentley states that, but I've heard it's different for the earlier ICVs (40 Ohms), as stated in this thread: http://www.bimmerwerkz.com/forum/3-s...ems-57198.html

      I'm working my way through the Bentley test.

      -Step 1 was unplugging ICV connector, observing if idle increases to 2000 rpm (it did).
      -Step 2 is measuring the resistance, like I'm trying to do.
      -Step 3 is hitting it with some voltage to see if it opens. I haven't done that yet. I have a trunk-mounted battery, so need to remove the ICV to hit it with some voltage; it got dark tonight before I could.

      Comment

        #4
        Measure resistance with the ICV unplugged. measuring with it plugged in will add in the resistance of the DME.

        I would use a low amperage 12v supply, not a car battery.
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          #5
          I found this extremely useful when diagnosing idle problems on my 325e
          Mesa Performance Parts...Idle FAQ
          http://www.mesaperformance.com/faqs/idle.html
          We specialize in parts and accessories for BMW and Porsche, and have items for Mercedes and Audi available.We offer monthly specials for our net customers, and feature online catalogs with secure online ordering. We have real time chat, an interactive bulletin board and BMW service FAQS.

          Comment

            #6
            You could always delete the icv system and leave the icv itself as a vacuum modifier to still have it idle under it's own power without adjusting the throttle plate. I've had to do it to every one of my early cars.
            sigpic
            85 swartz/metallic 325E
            84 alpine 325E
            85 zinnoberot 318i/R.I.P
            84 Bronzit 318i/sold
            purchase feed back here=http://www.r3vlimited.com/board/show...82#post3535282

            Comment

              #7
              we are so bad at reporting fixes...
              /______\_o_/______\
              l{(OO)=[//][\\]=(OO)}|
              \ #___======___# /
              |__/-------------\__|

              "Took me an hour to do this..."

              took me like three seconds to copy/paste it- FOR SCIENCE!!


              Barney Fucking Rubble

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