2470Re: [bmw e28] obc/speedo don't work
- Jun 15, 2004Hi,
Definately check out the speed transmitter on the rear
differential as it will affect the speedometer and
ecometer guages. I had an 86 528i with the same fault
and changed the speed transmitter in the diff and
fault cleared. Hope that helps you.
--- sheetfar <sheetfar@...> wrote: > I
have a 1986 528e with a manual transmission.
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> Recently, the following things have started to
> * 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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