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2462Re: [bmw e28] obc/speedo don't work

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  • Joel Trevino Gonzalez
    Jun 14, 2004
      Most definitely check out the area where work was done as your speedometer doesn't work correctly. Check and make sure everything is tighten up correctly and that the wires are connected back correctly to the correct screw towers/connection points.
      How long has your speedometer not been working? Did it happen right after that work on the car? Did you go over some debris on the road that might have put it out of order?

      I hope this helps somewhat,

      Joel Gonzalez

      sheetfar <sheetfar@...> wrote:
      I have a 1986 528e with a manual transmission.

      Recently, the following things have started to malfunction:

      * Speedometer doesn't work.

      * White-needle vacuum gage (located just below tach) doesn't work.

      * On Board Computer OBC works except for the fuel consumption &
      driving speed (MPG & MPH buttons).

      After driving the car for 20 minutes or so, the vacuum gage starts
      cycling on/off every 2 seconds. Eventually, the speedometer might
      work after the vac gage starts working properly.

      I replaced the expansion valve on the A/C evaporator last month.
      However, everything (all instruments were checked) worked fine after

      The most recent work was done several days ago on the rear axle
      portion of the car. If the differential transducer has a bad
      connection or has malfunctioned, could it cause any of the
      speedo/vac gage/OBC problems?

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