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Tach sometimes slightly high 900

posted by jerryc on Fri Jul 13 10:09 CST 2012
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last visit: Wed Oct 8 21:28 CST 2014

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Once in a while, with no apparent related event, the tach in my 93 940T reads about 300 rpm high. I notice this on the highway/overdrive, have not noticed it in other gears. It's not high enough to reflect what revs would be if not in od, and I have shifted out of od to test that. It then goes right back to the high reading when od is engaged again. When this happens it's steady, no jumping, goes up and down with revs and speed, just is 'off' a bit.
Then it just stops and goes to a normal reading, which is 3k/73mph.
This has happened randomly for over 2 years, 2 coils, several power stages, plugs/wires/caps/rotors.
Any ideas?

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Tach sometimes slightly high [900]
posted by jerryc on Fri Jul 13 10:09 CST 2012 >

Tach sometimes slightly high [900]
posted by spook on Fri Jul 13 14:50 CST 2012 > V

Tach sometimes slightly high [900]
posted by hardknocks! subscriber on Fri Jul 13 16:04 CST 2012 > V
- Tach sometimes slightly high [900]
  posted by jwalker on Fri Jul 13 16:28 CST 2012 > V
  - Tach sometimes slightly high [900]
    posted by spook on Fri Jul 13 19:09 CST 2012 > V
    - Tach sometimes slightly high [900]
      posted by jwalker on Fri Jul 13 20:02 CST 2012 > V
      - Tach sometimes slightly high [900]
        posted by spook on Fri Jul 13 20:52 CST 2012 > V
- Tach sometimes slightly high [900]
  posted by jerryc on Sat Jul 14 12:12 CST 2012 > V
  - Tach sometimes slightly high (Jerry and Spook) [900]
    posted by jd620 on Mon Jul 16 07:57 CST 2012 > V

Tach sometimes slightly high [900]
posted by jerryc on Sun Oct 14 14:14 CST 2012 > V
- Tach sometimes slightly high [900]
  posted by jerryc on Tue Oct 16 22:50 CST 2012 > V
  - Tach sometimes slightly high [900]
    posted by Gus123 on Wed Oct 17 14:51 CST 2012 > V
    - Tach sometimes slightly high [900]
      posted by javalion subscriber on Wed Oct 17 20:40 CST 2012 > V
  - Tach sometimes slightly high [900]
    posted by hardknocks! subscriber on Wed Oct 17 16:28 CST 2012 > V
    - Tach sometimes slightly high [900]
      posted by jerryc on Thu Oct 18 11:10 CST 2012 > V
  - Tach sometimes slightly high [900]
    posted by javalion subscriber on Wed Oct 17 22:39 CST 2012 > V
    - Not such a tangled web [900][1993]
      posted by lucid subscriber on Thu Oct 18 13:45 CST 2012 > V
      - Not such a tangled web [900][1993]
        posted by Art Benstein subscriber on Fri Oct 19 04:43 CST 2012 > V
        
        Not such a tangled web [900][1993]
        posted by jerryc on Fri Oct 19 11:49 CST 2012 > V
        
        Not such a tangled web [900][1993]
        posted by Art Benstein subscriber on Fri Oct 19 12:05 CST 2012 > V
        
        Not such a tangled web [900][1993]
        posted by spook on Fri Oct 19 12:36 CST 2012 > V

Are you absolutely, positively sure that the tach is malfunctioning? [900]
posted by someone claiming to be John McPhail on Fri Oct 19 06:42 CST 2012 > V
- Are you absolutely, positively sure that the tach is malfunctioning? [900]
  posted by jerryc on Fri Oct 19 11:46 CST 2012 > V
  - Are you absolutely, positively sure that the tach is malfunctioning? [900]
    posted by spook on Fri Oct 19 12:41 CST 2012 > V
    - Are you absolutely, positively sure that the tach is malfunctioning? [900]
      posted by hardknocks! subscriber on Sat Oct 20 06:30 CST 2012 > V
    - Are you absolutely, positively sure that the tach is malfunctioning? [900]
      posted by hardknocks! subscriber on Sat Oct 20 06:30 CST 2012 > V

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Tach sometimes slightly high 900