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I recently had a intermittant, then no spark condition and after replacing almost everythng via swaptronics without luck, I broke down and troubleshot the problem. It turned out one of the wires (red, power) on the back of the six pin had not been crimped properly and just pulled out but was still held in by the rubber boot so it was not obvious and made some contact until it didn't.
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74 Targa 3.0, 89 Carrera, 04 Cayenne Turbo http://www.pelicanparts.com/gallery/fintstone/ "The problem with socialism is that you eventually run out of other people's money" Some are born free. Some have freedom thrust upon them. Others simply surrender |
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09-29-2014, 08:10 PM
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Eva
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Is there a website for Ingo, I G-Searched them and CDI in a number of arrangements but came up with nothing useful.
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'78 SC Targa ~Brynhild~ Insta: @911saucy "The car has been the cave wall on which Industrial Man has painted his longings and desires." -Eddie Alterman- |
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09-30-2014, 04:32 AM
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ROW '78 911 Targa
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Just PM him?
Sent from my iPhone using Tapatalk
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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09-30-2014, 07:45 AM
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Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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a bad coil should not hurt the CD since its really jsut a capacitor discharging into a coil. you can have it rebuilt jsut for reliability but i think all that is replaced is the cap and a few SCR's for some more heavy duty ones if you will.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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09-30-2014, 08:27 AM
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Join Date: Feb 2006
Location: Ontario Canada
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1976 Yamaha XS360 ( Beats Walkin') 1978 911 SC Targa ( Yamaha Support Vehicle ) 2006 Audi A4 2.0T (Porsche Support Vehicle ) 2014 Audi A4 2.0T Technik (Audi Support Vehicle) |
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09-30-2014, 09:17 AM
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RGruppe #79 '73 Carrera RS spec 2.7 MFI 00 Saab 95 Aero wagon stick 01 Saab 95 Aero wagon auto 03 Boxster 90 Chevy PU Prerunner....1990 |
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09-30-2014, 10:08 AM
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Join Date: Feb 2006
Location: Ontario Canada
Posts: 2,947
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1976 Yamaha XS360 ( Beats Walkin') 1978 911 SC Targa ( Yamaha Support Vehicle ) 2006 Audi A4 2.0T (Porsche Support Vehicle ) 2014 Audi A4 2.0T Technik (Audi Support Vehicle) |
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09-30-2014, 10:33 AM
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Eva
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Update:
With the help of Lovely Mrs Saucy, I was able to get closer to an answer last night.
First things first. In the 4 years I've had the car, I've never fiddled with the CDI box/engine compartment electronics. I unplug the 6-pin and this little 3 pin was just hangin out...not plugged into anything...what's it to? (looks to have a blue and brown wire?)  Then I was able to test the key on voltage at the 6-pin, all good at 12.24 Volts, ruling out bad ignition, wiring or fuse from battery. Then, with engine cranking (lovely assistant) I tested the VAC across the left-most pins on the connector. (dist pulse shielding and dist pulse input) I was able to get a variable reading while cranking between .900VAC and .955VAC...does this seem right? CDI testing instructions I found said that if there is no pulse the dist pulse generator is bad. If there is pulse it's likely a bad CDI or coil. Well I just replaced the coil so don't think that's it. However, the instructions kindly left out what kind of VAC reading should be expected. I believe I've narrowed to the CDI, other thoughts?
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'78 SC Targa ~Brynhild~ Insta: @911saucy "The car has been the cave wall on which Industrial Man has painted his longings and desires." -Eddie Alterman- |
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10-29-2014, 06:48 AM
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I believe the 3 prong plug is for an external voltage regulator.
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Pete 79 911SC RoW "Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey |
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10-29-2014, 07:17 AM
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Eva
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Perhaps I'm living in a fool's paradise... 
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'78 SC Targa ~Brynhild~ Insta: @911saucy "The car has been the cave wall on which Industrial Man has painted his longings and desires." -Eddie Alterman- |
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10-29-2014, 08:21 AM
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The measurements on the coil output of the Bosch CDI box are not valid without connecting the ignition coil itself. The output is one side of a capacitor and a high-impedance DVM will get confused. You need a proper load and then the output is nearly zero (unless the internal capacitor is damaged).
Be careful, with a bad internal capacitor this output can produce dangerously high voltage with enough current to hurt you. Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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10-29-2014, 09:46 AM
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1974 Porsche 911 3.0
Yellow 911
Eva
Das Eos-Gone But Not Forgotten...
Battle Wagon
Heinz
RS Homage
1979 Porsche 911SC
1974 Porsche 911 Targa 3.6
