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Re: 318is tach/speedo gremlin! (archive)
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Posted by Automan on December 12, 2000 at 11:23:06:

In Reply to: 318is tach/speedo gremlin! posted by Thomas Dallal on December 10, 2000 at 22:59:41:


Until my 318is reaches operating temp. here in wintry NYC speedo & tach do not work at all. As it reaches operating temp. speedo resumes perfect function, then after 20 minutes or half an hour tach very gradually starts registering, at first only when I rev it hard - and at this point it is reading inaccurately and erratically, then, finally, after 45 minutes or so tach resumes nearly normal operation - though I suspect it shows idle speed as at least 500 rpm lower than it really is. Anyone ever seen these problems or have a good ideas how to remedy? Thanks and cheers, TOM

I have an '89 325i and my problem was the tach and econometer worked when really cold but as it hit op. temperature, they'd crap out. I found it was the rechargible ni-cad batteries in the Service Indicator board that the altinator recharges finally had it. The board is located in the bottom of the instrument cluster and is somewhat a pain to get at. (Watch for Static!!!) So go to radio shack and pick up a pair of AA rechargible nicad batteries. They are soldered in so be careful! I'm pretty sure it will solve your problem.


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