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Re: speedometer acting like tach........ (archive)

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Posted by E30 parts galore on May 14, 2001 at 20:23:41:

In Reply to: Re: speedometer acting like tach........ posted by Sung-Tae Kim on May 14, 2001 at 19:34:12:

Check following site.
I think this guy had same problem as you.

this after noon i was crusing in forth downshifted to third to come up to a light and noticed my speedo jumped up and went to 0 while i was still moving. then it stopped working totally until i tapped on the dash. i didnt notice any other problems but i havent drove her just yet. anybody else expierence similar abnormalities? other than that i cant express my love for the///M enough!!!
89 ///M r.i.p.
88 ///M running strong

I would say the main circuit boards has cracks in it and this is why,when you smack it,it works,for a little while....This comes from the heat and extreme cold....the solder welds become brittle and crack....causing it to short itself out...which can result in your si board failing and sometimes become totally inoperative...hope this helps...I've pulled many of these apart and this is most of the time the problem...

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