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?
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1991 745 & 1993 965 /// RIP: 86 764T; 79 262C
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