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Tachometer jumping around in 960 900 1997

posted by  ChrisS on  Wed Sep 29 03:15 CST 2010
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last visit: Thu Oct 10 21:18 CST 2013
[RELATED]

I think this is the first time it's happened in the year+ that I have owned the car. The needle jumps at idle from 500 rpm to about 1000 rpm, the engine does not change idle speed. There is a click sound from the engine bay that I have wanted to diagnose; it sound almost like a relay opening and closing. it's a metallic sound.

No engine work has been done, just suspension. The Neutral Safety Switch was replaced recently, although with an aftermarket version but I may install the factory Volvo version.

What could cause the tach needle to jump?
--
1991 745 & 1993 965 /// RIP: 86 764T; 79 262C






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