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Join Date: Feb 2003
Posts: 48
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wacky tack
My tach on a 84 911 seems to be eratic sometimes, others just fine. Any ideas where to look? maybe clean all the connedtions?
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Steve Larson Dana Point, Ca 84 Cab, lots of TLC |
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06-17-2009, 06:59 PM
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How is your alternator?
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A nose heavy airplane flies poorly, a tail heavy plane flies once. |
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06-17-2009, 07:02 PM
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Join Date: Feb 2003
Posts: 48
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fine I think
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Steve Larson Dana Point, Ca 84 Cab, lots of TLC |
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06-17-2009, 07:05 PM
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That engine has points, right? What is their condition? I'd try a brand new set just purchased.
HTH. John.
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John Original Owner 1973 911T. Webers, SSI, SAW & Polybronze, Carrera chain tensioners, 'A' calipers |
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06-18-2009, 02:50 AM
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No points in an '84.
If the tach is bouncing all over the place check your alternator output (multimeter on the battery terminals), if the output exceeds 14.5-15 volts (13.2-14.2 is considered normal) you probably have a bad voltage regulator. High alternator output will cause a bouncing tach (and other problems, not the least of which is cooking the battery). If your tach just drops to zero occasionally (like mine) there's probably some interference in the signal to the tach from the CD unit (partially broken or abraded wire, intermittent connector, etc.). Start by checking/cleaning the connections at each end (I've still got to check the tach connections on mine). Jerry M '78 SC |
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06-18-2009, 06:02 AM
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1979 Porsche 911SC
1978 Porsche 911 SC 3.0
