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'89 B230F Tachometer "sticks' & loss of power 200

posted by  TR Conn on  Sat Sep 22 18:55 CST 2012
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last visit: Fri Oct 24 10:32 CST 2014
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Occasionally my tach stops working and sticks somewhere. This is accompanied with a loss of power, it feels as though the ignition timing isn't advancing as it should.
I've tried different power modules, I have a "newish" crank position sensor (5000 mi), which I'm not eager to change since it is very difficult to get to (the engine is in a 122s). Sometimes it starts working again on its own, other times if the engine cools its OK. I've disconnected the battery to clear the memory and it will be fine.
There are no computer codes in memory and I have a later 951 computer.
I'll put in a new crank position sensor, but if there are any other suggestions I'm all ears.
Thanks,
TR







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    '89 B230F Tachometer "sticks' & loss of power 200

    posted by  TR Conn on  Tue Sep 25 00:52 CST 2012
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    last visit: Fri Oct 24 10:32 CST 2014
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    I think I found the culprit.
    While double checking the power module (the transistor switch for the coil) I found some corrosion on the connections. After cleaning them up things seem to be back to normal.
    Thanks for the responses.







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    '89 B230F Tachometer "sticks' & loss of power 200

    posted by  boxvolvo on  Mon Sep 24 21:01 CST 2012
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    last visit: Fri Oct 24 04:28 CST 2014
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    You might want to check the integrity of the wire from the coil to the tach. An abraded spot robbing against a ground will give those symptoms.








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    '89 B230F Tachometer "sticks' & loss of power 200

    posted by  Timbo245 on  Mon Sep 24 13:23 CST 2012
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    last visit: Thu Sep 27 20:32 CST 2012
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    Have you gone after the ignition coil? You can test them with a standard multimeter and specs/directions are available on the Googles. Although, if it's an intermittent deal it might test out it it's in working mode so if yours is old, I might just drop the $30 on it in good faith.

    Disregard if that's what you mean by "power module"







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