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Tachometer jumps 700 1989

posted by  Brick Skinner on  Thu Nov 12 11:19 CST 2009
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last visit: Fri Jun 13 13:31 CST 2014
[RELATED]

1989 740 Turbo,

While in park, engine warm, and idling normally. The RPM's are steady but the tachometer jumps every few seconds.

My daughter said it hiccoughed on her today while driving through town. She said the tach was jumping too.

So, what's the most probable cause of this?
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