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Join Date: Apr 2008
Posts: 2
Jumping Tac

87 325i - 148,000 miles - Automatic - Runs fine, but the tac jumps up and down. It will just sit there at zero, then jump up to 2,000 rpm or what ever speed I'm going, then a second later, it drops down to zero again. Sometimes it works for a while... say 15 20 minutes. It acts like it's just losing power intermittently? Before I go pulling the dash apart to pull the cluster, it would be nice to hear if somebody else has had the same problem.
Old 04-27-2008, 03:31 PM
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Sounds like you need to change batteries in your SI board.
Old 04-28-2008, 04:44 AM
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Thanks... but I plead ignorance.....SI? as in the circuit board on the back of the instrument cluster?
Old 04-28-2008, 08:05 AM
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Bingo...
Old 04-28-2008, 10:28 AM
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UH I would say its a loose connection in the cluster. All you have to do is tap the on the cluster if it jumps then its a loose connection. But it also could be a bad tachometer. Question are the lights on for oil/inspection? If so get them reset if they come back on then the si batteries are bad if not then its just a loose connection.
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Old 04-28-2008, 11:49 PM
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