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Heres a tach question for you (no its not the SI board)

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    Heres a tach question for you (no its not the SI board)

    Last year I had an issue with my cluster, the old style SI board had taken a crap and leaked battery acid all over everything, and the cluster just about ceased to function. I ordered a late model Si board from Jean, put it in, fixed all the broken solder joints on the board and everything worked great.

    Recently, the tach has been cutting out from time to time. I pulled the cluster back apart to see if maybe I had broken solder joint on the tach unit itself (I didnt find any but re-flowed all the joints anyway) It still acts up from time to time.

    When Im idling, it will drop to 0, slowly climb to 700, then drop again. As I increase the revs it will just plummet to 0 and stay there, and vibrate a bit. It also affects the mpg gauge as well when it does this.

    I have a late model 88 325is, and I noticed it has a lead wire coming off the #1 spark plug wire, and it goes to a connector under the diagnostic plug in the engine bay..it is frayed a little from rubbing against the engine, would this be causing the issue at all? Or is this board starting to take a dump too??

    #2
    The tach problem sounds like a problem in the tach or in the main PCB of the cluster.

    The Cylinder ID sensor on the number 6 plug wire has nothing to do with operation of the tach. That signal is used by the DME only for timing of the fuel injectors.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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      #3
      hm i will see if I can source a tach, and see if it cures the problem...

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        #4
        I resoldered a shit-ton of connections on mine: it is fine now, but had the same symptoms as yours.

        Closing SOON!
        "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

        Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

        Thanks for 10 years of fun!

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          #5
          yeah i already did that before. When I had it apart the second time i went over every joint with a magnifying glass...all are good./

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