need help piecing together my CIS - 1981

[Kemo]

I am currently refeshing the CIS on my 81. The parts pretty much came in a box. My big questions are concerning the connectors that go to the cold start valve and the plate sensor and what not. it seems that they can be easily cross connected.

also, is there a diagram that shows the proper vacum line routing?

I have a 78 and a 76 motor as a reference, but the 81 has alot more "stuff" to connect it seems.

any links are super helpful

[lsf911]

One of my favorite CIS links:

911 CIS Primer - Vacuum Lines

[Bob Kontak]

I will PM you my phone number. I have a "stock" 81 twenty feet away that is doing just fine - on the engine side - a few minutes on the phone can save a lot of time typing.

[boyt911sc]

Kemo,

The '81 SC CIS has a different aluminum vacuum tubes (4) than the early CIS like the '77 or '78 CIS. They ('77 & '78) have three (3) tubes. I am not home right now and if you need some pictures of the back side of the engine where all these vacuum and fuel lines are located let us know.

There is actually an '83 SC CIS unit sitting in my garage that you might like to see. I'll post the pictures after I get home tonight.

Tony

[Kemo]

scouring the CIS Vacuum link above...part of my problem is I can't spell vacuum. two U's looks funny Hopefully it wont come to a phone call, but I appreciate the offer Bob!

[Cdnone1]

This might help. This system is off an 82.
The red arrow should be a black connector that fits the sensor plate. The yellow arrow is a larger connection that will only fit the throttle. The blue arrow is a blue connector that fits the cold start valve and the green arrow is a green connector that fits the frequency valve.
Hope it helps

[Kemo]

Cdnone1,

thanks for that snapshot! That looks a lot like what I had in a box about 2 weeks ago. Ill be out in the garage later on today and will add some pictures to try and give you guys an idea of what im fumbling with. After looking at the CIS Vacuum diagrams (911 CIS Primer - Vacuum Lines) it appears that I am missing #9 which is the vacuum control but I always thought that was a deceleration valve. I have one of these on my 78 but I don't see one in the picture you just posted. From the CIS primer link, it seems the Deceleration valve and the Vacuum control unit are the same. In 80, the design appears to have changed to the round puck style and is located over near the FD as opposed to the one that hangs off the Throttle body in 78. I might end up trying to call Bob if I have to punt

[Cdnone1]

I just replaced my air box and had everything apart so let me know if you need anything
Steve

[lsf911]

Kemo,

Look at the bottom diagram on that page. That is for the 81-83 model years.

[boyt911sc]

Originally Posted by Kemo

Cdnone1,

thanks for that snapshot! That looks a lot like what I had in a box about 2 weeks ago. Ill be out in the garage later on today and will add some pictures to try and give you guys an idea of what im fumbling with. After looking at the CIS Vacuum diagrams (911 CIS Primer - Vacuum Lines) it appears that I am missing #9 which is the vacuum control but I always thought that was a deceleration valve. I have one of these on my 78 but I don't see one in the picture you just posted. From the CIS primer link, it seems the Deceleration valve and the Vacuum control unit are the same. In 80, the design appears to have changed to the round puck style and is located over near the FD as opposed to the one that hangs off the Throttle body in 78. I might end up trying to call Bob if I have to punt

Kemo,

Part #9 is the vacuum control (limiter) commonly referred as the decel valve in this forum. You don't need that for your new set up. The SC's ('80 - '83) has a different looking decel valve. It looks exactly like an AAV (auxiliary air valve) but has a nipple connected to a vacuum. It was so cold last night when I got home and failed to take pictures. Steve has one already for you.

Are you missing some parts? Please post a picture of your new CIS unit. Thanks.

Tony

[Kemo]

ok...the black connector was plugged into where the green arrow above is pointing. This particular black connector is not part of the main wire harness and is on its own separate loom that has its own 12 pin connector similar to the one on the main engine harness. Plugging them in now and will take a snapshot.

[Kemo]

alright. got the connectors in the right spot...check the pics and the customary shots of the cars and the garage

last question...where does the vacuum line go that's just dangling there. it starts at the decel valve, goes to a 3way splitter and then goes to throttle body and ??

thanks for the help on this one!

[Speed Buggy]

Subbed,I'm in the same spot.

[boyt911sc]

Kemo,

In reference to Steve's attached picture showing the different colored arrows, follow this:

Engine wire harness:
Blue = CSV
Red = AFS switch
The WUR and AAR are with the above engine harness.

A separate 12-pin connector from ECU:
Green = FV
Yellow = 15 degree TPS (throttle position switch)

Note: Above color code refers to the arrows (pic) and not to the electrical plug's color.

Tony

[timmy2]

OK guys, too many incorrect wiring connection directions so far...

For the engine harness connectors:

Blue -Cold start Valve -Has yellow and red black wires to it.
Green - Air flow Switch - Has brown and Brown/Red wires to it
Black - AAR - Has red/white and brown wire to it.
Grey - WUR - Has red/white and brown wires to it.

Peel back the boot and confirm the colors as someone may have made changes over the years.

My information is based on the brand new, never used '81-'83 engine harness I have and use to create new ones from.

The Lambda harness has other connectors that are different.

[Kemo]

Ok...ill be back at it sunday afternoon. Ill peel back some connectors and verify the wires and report back. Thanks for all the info

[Pazuzu]

Originally Posted by Kemo

ok...the black connector was plugged into where the green arrow above is pointing. This particular black connector is not part of the main wire harness and is on its own separate loom that has its own 12 pin connector similar to the one on the main engine harness. Plugging them in now and will take a snapshot.

Originally Posted by timmy2

The Lambda harness has other connectors that are different.

The connector you are referencing above Kemo is the Lambda harness mentioned. It's a separate wiring harness, and connects to the throttle body, and frequency valve. It ends with the 12 pin connector that is mounted on the back edge of the engine bay near the firewall. That feeds the computer under the passenger seat.

[Kemo]

ok...I peeled back the hoods on the connectors and here is what I came up with.

the Black connector: Black/Red Stripe and Black/Red Stripe with a yellow mark

Green connector: Brown and Brown/Red Stripe

Blue connector: Limey Yellow and Limey/blue stripe and red/black stripe (3 wires)

after reading thru this...

I pulled the connectors to the AAR and WUR and they have the Red/white stripe and brown wires.

[Kemo]

so...100% agreement on AAR and WUR and they are connected

from the above info, 100% on the Cold Start Valve

that leaves the green and the black

[Kemo]

and the green connector is now connected to the Air Flow Sensor

which leaves the black connector that is part of the separate harness. I have that connected to the Frequency Valve

Sound about right?