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I think it is most likely the guage because... (archive)
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Posted by Rob Anderson on September 21, 2001 at 00:20:42:

In Reply to: Faulty Tach. Reading posted by jim on September 20, 2001 at 09:23:27:

The tach is driven off of the ECU. I doubt the ECU is giving a faulty signal because then the car wouldn't be running correctly, so my thought would first be the tach.

Rob A
M535i SIG Chief Technical Advisor
www.m535i.org


))
I have a 1985 535i and the tach has been giving incorrect readings. Sometimes it reads the correct rpm and sometimes it doesn't. For example, idle rpm is around 700. When it malfunctions, it reads about 200. At faster speeds when the rpm should read around 2000, it reads around 1000. It doesn't affect the driving, it must just be a bad gauge or linkage, or something else. Any suggestions? Cost of repairing? Thanks,Jim




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