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tachometer weirdness 900

posted by  Volvo_geek on  Wed Apr 21 16:51 CST 2004
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Recently I've noticed my Tach having odd behavior on idle. After the car has warmed up and I'm at a stop light idling, sometimes the needle will drop down to zero. However, the engine feels like it's idling fine, at the same pitch and vibration as usual. Very rarely, the needle will jump rapidly around in about a 1500 RPM range from the actual value. Is this an early warning of my RPM sensor going bad? Or is it in the dash? Thanks in advace guys for any comments.
--
1994 Volvo 940 Estate








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    tachometer weirdness 900

    posted by  Park on  Thu Apr 22 00:19 CST 2004
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    last visit: Tue Apr 22 07:46 CST 2014
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    If you have not replaced the rpm sensor and it has some age on it, then replace it even if it dose not cure the tac problem, it is good PM.







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