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Scott R's Avatar
 
Join Date: Feb 2001
Location: Aspen CO US
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Electrical help please!

If you read my other post I managed to melt my second frequency valve, and today I have spent the day tracking down wires and connections, first the easy part, which of the plugs in this picture go to the WUR and which goes to the frequency valve?



I think I may have it backwards based on what's coming of pin #87 in OXS relay.

Also here you can see what happened to the plug itself, the damage to the frequency valve is worse.



It appears that I have a contionous circuit between the red/wht wire on each of these plugs, and the little two pin flat plug that's unused. The red/wht wire is +12 through the system. However I can't find the switched ground for the freqency valve, where does he come from?

Having inherited this car with motor out and CIS is pieces I had a very vague roadmap on where all of the plugs went.

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1980 911 SC
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Old 10-16-2005, 03:43 PM
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Monday morning bump, hoping that another 80SC owner can help me out here.
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Old 10-17-2005, 08:19 AM
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According to the Bentley Diagram:
From OXS relay pin #87B a BLK/RED wire goes to the Freq. Valve. and on to pin #15 on the OXS Control Unit.
From OXS relay pin #86 a RED/WHT wire goes to the WUR with the BRN wire to ground.
Make sure that you don't mix up the plugs for the Cold Start Valve with the Throttle Valve Switch or Airflow Sensor Contact.
CSV is RED/BLK & YEL
TVS is GRN/RED & BRN (Ground)
ASC is BRN/BLK & BRN (Ground)
Get a Bentley manual, you'll love it.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats.
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Old 10-17-2005, 11:06 AM
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Scott,

Will this help for your critical review?

The title to this excerpt is:
“Additional Current Flow Diagram,
Type 911SC USA, Model 80.
Oxygen Sensor System.”

(C) Dr. Ing. h.c. F. Porsche A.G.

Best,
Grady
Old 10-17-2005, 11:31 AM
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Grady, I have that diagram from my service manual as well. What I can't figure out is that it shows the frequency valve having a red/blck only I only have a red/wht?!?

Damn!

Well I am hoping that Orren down at Eurosport can help me out on this, he has an 80 with the engine out that we are going to try and sluth thought, damn PO's!
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Old 10-17-2005, 12:34 PM
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Dude, cut your losses...



This is a Bitz EFI setup. Very easy to install, a learning experience to tune, and a BLAST to drive...

I cut my losses on CIS at about $700. Where will you? : )
Old 10-17-2005, 12:46 PM
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LOL, I'm a purist and I love Bosch injection. I'll get it somehow.
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Old 10-17-2005, 01:06 PM
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Quote:
Originally posted by Scott R
Grady, I have that diagram from my service manual as well. What I can't figure out is that it shows the frequency valve having a red/blck only I only have a red/wht?!?

RED/WHT sounds like WUR?
Why not trace the wires from the pins individually for continuety?


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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 ".
Old 10-18-2005, 06:57 AM
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Quote:
Originally posted by Gunter
RED/WHT sounds like WUR?
Why not trace the wires from the pins individually for continuety?


That's what I am doing now, I have found that the red/wht is shared with all three of the plugs on the picture and it goes to pin #3 on the forward main harness connector, then to pin #87 on the forward relay.

I can't seem to find the wire yet that somes from 87b to the engine compartment, but I need to pull more plugs.

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Old 10-18-2005, 08:24 AM
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