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intermittent tachometer issue

Started by the_kirkwood, December 03, 2019, 03:43:20 PM

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the_kirkwood

Tachometer is bouncing erratically at idle.  When riding it normally drops to zero rpm with some random twitching from time to time.

Is this likely to be a bad tachometer, bad signal to tachometer or maybe a bad ground?

Is it common for these tachometers to go bad?

thanks in advance
1986 fj1200

FJmonkey

The ground connection is almost always the issue.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

the_kirkwood

1986 fj1200

Pat Conlon

Also to check is the grey signal wire coming off your right side #2/3 coil. Clean that connection.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3