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Registered
Join Date: Oct 2002
Posts: 31
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Tach help
I have the 3.0 SC engine installed in the 84 Carrera. Everything seems to work except the tach. Violet/black is attached to violet black. Should it work or is the 3.2 tach actually digital rather than analog.
Thanks in advance Bryan |
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02-23-2006, 05:22 AM
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Longhoods Unite!
Join Date: Mar 2005
Location: Bloomington, MN
Posts: 311
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search for tach threads, there have been like 4 with lots of good info on it within the last 2 weeks or so, and there is alot of other info and threads with wiring diagrams and other good help at the click of the search button
phatty
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1970 911T -- Neglected, oil burning problem, batman smoke 1974 914 2.0 Weber'd -- new project!! **My Wife and I bought our first house in August of 2009, the footprint of the house is just over 1100 sq. ft...my garage is just over 1000 sq. ft. We compromise well  **
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02-23-2006, 05:46 AM
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Join Date: Nov 2004
Location: Greater Metropolitan Nimrod, Oregun
Posts: 10,040
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narrow the search by putting Sherwood or Warren in the search box - not sure which, I think the latter.
you might compile the good posts here as a public service to the next guy...
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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02-23-2006, 10:28 AM
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Join Date: Jan 2003
Location: the beach
Posts: 5,149
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When I put my '78 3.0 in my 1970 E, I had to replace the tach with one that is compatible with the different ingition system. I don't know about the 3.2 engine, but you may need to get a different tach also. It think it depends on the year of the 3.0, as the distributer changed at some point.
My tach still does not work, but I think it's because of a faulty Bosch ignition.
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Charlie 1966 912 Polo Red 1950 VW Bug 1983 VW Westfalia; 1989 VW Syncro Tristar Doka |
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02-23-2006, 10:46 AM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Bryan,
Have you verified [with oscilloscope, CMOS logic probe, or Noid] that there is a pulse train at the Black/Violet wire going into the tach??? The 'TD' signal from the SC Bosch CDI unit should drive the 3.2 tach just fine, but something may have caused a problem with the TD signal from the CDI, such as D8 being blown. There must be continuity from CDI unit to the input lead into the tach when checking for a signal, that is, the connection must be normal, not disconnected when checking for the pulses! There is documentation on the SC CDI unit in this thread: 6-pin SC/Turbo CDI unit repair documentation
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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02-23-2006, 10:51 AM
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