'83 CIS WUR Schematic?

[Jerry Endler]

One frustrated Slvrbk:

My problem child is a '69 911T restomod: Looong term retirement project - Bare metal restomod with a cen sensor and controller, added a cabin center console, '83 3.0 SC with 915 5 Spd, new custom wiring harness, deleted O2 sensor and controller and Catalytic Converter ... Kept everything else.

Not able to get engine running past the first two 'hiccups' ... engine cranks easily, great spark from grounded spark plug, excellent flow of fuel to all six injectors, timing spot on, but don't have the equipment to do fuel pressure tests. Have hopefully tracked the issue to the CSV and/or the WUR. I'm loath to remove the CSV, but will, since it's buried at the back (front) of the engine and will be a pain to remove and reinstall.

My question for this Thread is to ask the community if anyone has a schematic of the '83 WUR connections? There are five connections to the existing WUR (two gas, one electrical, one vacuum, and one mystery connection). The diagram that I have from the Porsche Service Manual (pic attached) shows the WUR but only two fuel connections. My other references (Bentley, Hayes, Porsche schematics, You Tube, random passerby's, etc) shed no help. One of the posts on You Tube mentions the same page from the Service Manual and the fact that it only shows up to the '80 model 911SC . Am most interested in the copper/brass connection that's mounted in the base of the WUR and what's its purpose and where it goes to when connected. The connector isn't shown in the attached schematic.

I'm thinking that it's the CSV but want to eliminate the WUR since it's easier to get at.

Any help would be appreciated.

[PeteKz]

Do the basic stuff first: Compression, fuel, spark. If yo the engine was recently rebuilt, or you did a compression check already, then rule out #1.

Does it fire if you spray starting fluid into the intake horn? If so, then you have spark and are lacking fuel.

Then check to make damn sure that you connected all the hoses. On the top of the WUR is a part number. It consists of 6 or seven digits die cast plus three digits stamped. What is that number?

That's the first step, but before spinning out all the possibilities, do that and tell us what you find. Also, look in past threads and read up about peolple with the same problems as you.

Reference for all things CIS: https://cis911primer.com/home.html

[RarlyL8]

You're really not going to get very far without a fuel pressure tester. They run around $100 on eBay and a really easy to use. Will save you a bunch of time swapping parts and guessing.

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2499334.m570.l1313&_nkw=CIS+PressurTest+Kit&_sacat=0

[Jerry Endler]

Many thanks to PeteKz and COB/RarlyL8 for your quick responses - much appreciated.

The WUR USA Bosch #0438140 045. Compression good, spark & fuel as mentioned previously. Starting fluid try gave a large ‘pop’ a couple of hiccups but no continuous injection. Fuel pressure tester kit will be ordered tomorrow. So am still thinking CSV issues.

Although I appreciate your links I still don’t have an answer to my question - does anyone have a connection schematic for the ‘83 WUR?

Will be on a business trip starting Tuesday for a couple of weeks so my responses may be a little slow.

Thanks again for your responses … TBC

[boyt911sc]

Jerry,

Is your ‘83 SC motor a US or ROW model? If you have a US version, then you have the wrong WUR. Keep us posted.

Tony

[Schulisco]

Electric schematics can be found here:
https://classickabelboomcompany.com/wiring-diagram-porsche/

To get familiar with CIS I recommend to watch the video series from KlassikATS:
https://www.youtube.com/playlist?list=PLkWFofpgz2OgF9FdliKnlzuY0pygqRkMj

Thomas

[Jerry Endler]

In response to boyt911sc & Schulisco questions and responses I've got the following:

boyt911sc:

Tony, good question, but I really don't have an answer, nor would I know how to find out if it's a US or ROW model ... I doubt the engine is a ROW as I originally purchased the '83 3.0 SC engine and 915 5 spd xmission from the aase bros. when they were still in Anaheim, CA back in Dec of 1994. Engine #=64D1095 (code #930.16), xmission #=17 6843. Both supposedly came from the same 1983 SC Chassis #= 119122752. Aase inspected the lower end of the engine - blessed it, and only performed a valve job and seals replacement ,and refreshened the xmsn syncros back when I originally purchased them. I question the 'same car' statement since the xmsn seems to be a '79. If the existing WUR is not correct, how does that mess things up?

However, work and life got in the way of my dream restoration and I mothballed the engine/xmsn and had the '69 911T (a rust bucket in 52 boxes - not kidding - which I was able to purchase for $550 as it was a real mess) stored as I traveled the world fixing things and making them work. When the boss 'finally' allowed me to retire back in 2013 I had everything shipped back to CA where I was finally able to start the restoration. Again, life and family has a tendency to get in the way of the best of plans and slowed things down a lot and am just now ready to finish the restoration journey and cruise the highways with my Better Half in the Freeway Queen - Project 911T SC.

I had Wayne Baker and his pals at Personalized ******** bless the engine and xmsn out of storage and I learned how to stuff them into the '69 911T. Needless to say I'm frustrated by all the stuff Porsche attached to the engine back in '83 to get it to pass the smog stuff - I'm ready to take Aztim's 10/13/24 advice to mhackney's posts and rip the bandaid off the CIS system.

Schulisco:

Thomas, thank you for the electric schematics link, but I already have those which I referenced heavily as I designed and fabricated my new harnesses. Great reference to anyone who would need these.

I also know about, and watched throughout, the You Tube series from KlassikATS. Very interesting character.

To All:

Am still looking for an installation schematic for the '83 WUR that would show the fuel and vacuum line connections to and from the engine - especially that copper/brass fitting at it's base.

Thanks again to all who've responded ...

[PeteKz]

I have an 089 WUR on my 1980 SC ROW engine. I don't have a picture handy so here's the word explanation:
--The brass nipple that sticks out to the left side of the engine is the vacuum connection to the Thermo Valve. Look for the loose hose from the thermo valve and plug it in there.
--The black plastic or metal line that comes from the FD to the WUR screws onto the top of the WUR at the rear (of the engine) side of the disc on top of the WUR. That is the Control Pressure line. The forward connection to that disc is the return line that goes to the return hard line at the front of the engine on the left side.
--The nipple on top of the WUR goes to the vent nipple on the throttle body. That is the topmost, rearmost nipple on the throttle body, up against the plastic air cleaner cover.

[Schulisco]

Originally Posted by Jerry Endler

To All:

Am still looking for an installation schematic for the '83 WUR that would show the fuel and vacuum line connections to and from the engine - especially that copper/brass fitting at it's base.

https://cis911primer.com/pages/descr_lambda.html

From the 911 workshop manual:
https://forums.pelicanparts.com/porsche-911-technical-forum/883042-air-leakage-intake-manifold-sleeves-7.html#post8845961

Try to get the Porsche 911 workshop manual, it's urgently required when working on these cars.

Thomas

[boyt911sc]

Jerry,

You need to identify your motor. Do you have a picture of your motor? I like to see side view of the motor (cylinder 1-2-3) including the throttle body. Same with side 4-5-6. Posting the engine type 930/xy is imperative.Where are you located?

Tony

[917_Langheck]

64Dxxxx is an 83 North American engine and the 930/16 specifies for an SC.

https://www.stuttcars.com/porsche-911-engine-numbers-1965-1989/

[Jerry Endler]

Finally have a few minutes to reply to you all ...

PeteKz: Thanks for the verbal explanation of the WUR connections and will apply them when I get back in town late this week.

Thomas: Thanks for the link to the CIS schematic and I do have the 911 workshop manual but neither shows the connection that I was looking for that PeteKz verbally described.

boyt911sc: The engine/xmsn are currently installed so it would be nearly impossible to take any meaningful pics. The engine # was listed in my 10/21/24 posting as a 930.16.

917_Lanheck: Thank you for the numbers confirmations.

I hope to be back late this week to continue the journey of getting this project humming down the street. Will keep you all posted.

My personal location is Carlsbad, CA ... You all have a safe Halloween ...

[Schulisco]

Jerry,

then these links may help you a step ahead:
https://nineelevenheaven.wordpress.com/vacuum-connections-on-the-k-jetronic-for-the-911-sc/
https://nineelevenheaven.wordpress.com/adjusting-the-warm-up-regulator/

Better explanations not available iirc.

Happy Halloween!