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Registered
Join Date: Sep 2007
Location: Virginia
Posts: 24
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CDI/Ignition Help
Hello all,
I listened for the whining sound at the CDI, however, there was none. I read at www.permatune.com (this is the unit that is there) that they do not whine. I had no spark at the plug..dist...etc... The harness going to the CDI had a voltage of 7.5V. The car had 12V at the battery. (this seems like a problem but not sure) Anyways, I disconnected the tach plug by the o2 sensor....AND IT STARTED! plugged it back....and no start. (The tach is somehow part of the circuit I believe) THIS is the problem, but I am not sure from here. Is this a problem with the Tachometer itself or the wire leaving the distributor to the CDI? The car will run now but I have no tach. Is it a possible ground problem. If anyone has been there...done that... please let me know. I did not see anything with my search. Thanks. PS car is an 89 930 but I believe the SC 911s had the same set up...plus I hope you guys know more about maintaince than the 930 guys. |
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04-09-2008, 01:38 PM
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Registered
Join Date: Jul 2006
Location: Burton on Trent UK
Posts: 65
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Search on here there is a lot of info about the 6 pin CDI on the 930. In your case I guess that you have a fault with the tacho that is grounding the pulses used to fire the thyristor in the CDI unit.
Regards Steve |
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04-19-2008, 06:57 AM
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Somatic Negative Optimist
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I believe that the turbos had an 8-pin Bosch CDI module at some point?
Permatune doesn't have a good reputation for performance or durability, do a search here. Why not try and find a used 6 or 8-pin Bosch? Or replace the Permatune with MSD?
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats.  Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
Last edited by Gunter; 04-19-2008 at 08:32 AM.. Reason: When did turbos get the 8-pin? |
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04-19-2008, 07:10 AM
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Registered
Join Date: Jul 2006
Location: Burton on Trent UK
Posts: 65
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I have an 1985 930 and mine has a 6 pin unit - I have it on the bench right now.
Regards Steve |
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04-19-2008, 07:16 AM
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Somatic Negative Optimist
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That would be even better.
A 6-pin is easier to find.  I wonder if the 8-pin module came in after '89? Hmm............ Lot's of stuff here: 6-pin SC/Turbo CDI unit repair documentation
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats. Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".
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04-19-2008, 08:29 AM
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ME 262 (SOLD)
Colibri
Gas Mizer
Mileage King
Dog Bus
