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Erratic speedometer

posted by  chuffsy on  Sun Nov 24 14:52 CST 2002
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last visit: Tue Oct 21 18:17 CST 2014
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My 91 740 did pretty much the same as yours except mine would go to 70 mph..be erratic at times till it finally quit. If your odometer is working ok then the sending unit (called a hall sensor, located in the differential is working fine....my speedo is electronic..
yours is probably electronic too..no cable on this one! I made a post many months ago and a feasable reply I received was from a gentleman in Malysia who
claimed to have dismantled a few of these units and his findings were that the failure of the speedo is due to a fried chip located on the speedos electrical board!!! AS to why the premature failure...he didnt say...nor a source for these
chips...so like you I am driving around with a broken speedo...cost of a new one...$500!!! not for the cluster ...just the speedo!!! AS an alternative
maybe a junk yard! Incidentally and for whats it s worth the speedo unit is japanese made...yamazki or yamaki ..something like that ...Good luck






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New Erratic speedometer [700][1991]
posted by  willc  on Tue Nov 12 03:39 CST 2002 >


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