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Bouncing tach and stuck MPG gauge

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    Bouncing tach and stuck MPG gauge

    Replaced my alternator with a reman from Autozone and now I'm experiencing some problems with my tach. While driving at a steady speed (~2500 rpms) the tach would up to 3000 rpms+ periodically then back down.

    Also, at times the MPG gauge would not work. Sometimes it stays all the way left, all the way right or around 10-15 mpg. It'll stay that way until I shut the engine off and restart the car.

    Thinking perhaps i got a bad alternator. Never had an issue with my tach until the alternator replacement.

    Thoughts?

    Thanks for your inputs...
    - 90 325is, 5 spd

    #2
    doubt it. Your tach is electronically controlled. Alt just has to do with the voltage and charging system - nothing to do with your tach or gauge underneath. I would swap another cluster in and see if anything changes. If so, then you have a problem with your circuit (SI board batteries) or a shorting tach.
    sigpic

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      #3
      That would make me think first of a bad SI board in the cluster and second of a bad tach/mpg unit.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

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