Originally Posted by Dave Kost (Post 11111977)

Did you ever set the CO to spec?

Did you test the throttle switch?

Sorry I'm too lazy to re read the entire post.

Originally Posted by timmy2 (Post 11085175)

Plug for ROW vacuum time delay pod. Not used on US Lambda cars

Originally Posted by Dave Kost (Post 11113396)

Hi Mike.

You have two separate issues without taking into consideration the CO setting.

Overheating.- Check you trombone cooler in the front fender? Is it hot after the engine is warm? Lean running could cause the overheating too.

Intermittent shutting off. Most likely electrical. Again clean all connections, paying attention to the fuel pump relay and ground on the CDI box. I would send the CDI and ECU to Systems Consultating in La. for testing- if the stalling continues. Going over a bump could cause a loose connection.

Look at #20 & 21 in this thread about throttle switch (s) operation.

http://forums.pelicanparts.com/porsche-911-technical-forum/956477-cold-start-issue-my-newly-refreshed-cis.html

Hang in there.

PS- How about a picture

Originally Posted by pmax (Post 11113441)

Is there a mix of US and ROW components here ?

What's the history of the car and engine ?

Originally Posted by pmax (Post 11113474)

What are the component numbers ?

"3. WUR model number: 0438140"

All WURs start with those, you need the 3 digits following which identifies the model in your engine.
Fuel distributor has the component numbers on a plaque 0438100xxx.
Post the model of the lambda controller under the passenger seat 0280800xxx.

Hopefully you have a matching system.

Originally Posted by mike621 (Post 11113510)

http://forums.pelicanparts.com/uploa...1606084974.jpg
http://forums.pelicanparts.com/uploa...1606084974.jpg

Originally Posted by mike621 (Post 11083512)

Thanks to everyone on this forum and the CIS Dummies thread for the helpful information to help troublshoot my new-to-me SC. I'm posting a thread relating to my own vehicle hoping to get some perspective from experienced owners, as this is my first Porsche. I am pretty confident at DIY, have a decent set of tools, and a Bentley Manual.

The main symptoms I am attempting to solve for: 1) poor idle when cold, including intake backfire when I attempt throttle. Levels out eventually, but my other symptom presents itself once warmed up and driving. 2) Randomly loses power completely, and if I attempt to add throttle in response, will backfire out the exhaust and stall. Will start right back up and keep driving.

Here's my current data based on the CIS Dummies thread format, checked with CIS gauges:

1. Year of engine: 1982
2. US or RoW (Rest of World): US
3. WUR model number: 0438140
4. Ambient temperature at time of test (in degrees C): 19*
5. WUR Resistance (in Ohms): 9.5
6. System Pressure (in bars): 4.9
7. Cold Control Pressure (in bars): 2.1
8. Warm Control Pressure (in bars): 3.5
9. Time delta for Cold -> Warm Control Pressure (in minutes & seconds): 2 min
10. Residual Pressure @ 5 min (in bars): 1.4
11. Residual Pressure @ 15 min (in bars):1
12. Residual Pressure @ 30 min (in bars):0
13. Residual Pressure @ 60 min (in bars):0

My main concern among this data is the loss in residual pressure, though I am not sure my main conditions I am experiencing relate to this. Entirely possible I have multiple problems. I bought the car AS IS with issues.

There is a receipt from several years back stating the car was sitting and had the fuel filter done, mixture adjusted and pop-off valve added.

I've had the car two months and have done some work so that it will pass smog and complete the ownership transfer to me:

-Oil Service (Cooling Lines, Hoses, Feed Lines over cams)
-Valve Adjustment
-Ignition Service: Plugs, Wires, Cap, Rotor
-Vacuum lines Replaced off the throttle body, distributor
-Smoke Test (Airbox OK)
-New Catalytic Converter
-New Oxygen Sensor
-New Oxygen Sensor Relay
-New Ignition Switch
-Cleaned and replaced most fuses in the front fusebox
-R&I'd fan and replaced alternator ground
-Replaced Battery Terminals
-Set timing 5*, Z1, vac lines on (now seeing conflicting info to disconnect one or both vac lines, so some clarity here would be great!)

I am considering the following as next steps:
-Compression Check
-Fuel Injector check (will order new o rings and anything else necessary to reinstall)
-Swapping Fuel Filter (Last done in 2017)


I'd appreciate any advice or thoughts on where to turn my attention to next. I don't want to throw any unnecessary parts at it in lieu of solid troubleshooting.

Originally Posted by boyt911sc (Post 11113550)

Mike,

The FD is -077.

The number for the WUR is to the right of 086 or to the left of 980. You could see the numbers from your picture but hard to read.

Tony

Originally Posted by Dave Kost (Post 11113778)

Mike,
1 checked my Spec Book (Dempesy) It simply says 19-25 degrees BTDC at 6000 rpm with vacuum lines disconnected then let the idle ignition timing fall where it falls with vacuum lines connected. (I believe I plugged my retard vacuum line.)

So, check and see where your timing is at 5-6000 rpm?

Let us know.

Originally Posted by Dave Kost (Post 11113907)

OK.

What coil are you running?
Get a voltage meter that plugs into the cigarette lighter plug to monitor running voltage. Maybe their is a correlation of the shut downs.

Originally Posted by Dave Kost (Post 11113913)

With advance Vacuum line connected to ignition distributor total should be around 30*. Right? We are checking that the advance is working on the distributor. At 250K who knows.

Just thinking out loud from far away.

Originally Posted by boyt911sc (Post 11113945)

Mike,

“481” is not the WUR ID # (0-438-140-481). That is probably the serial number. Take a picture and post it. The numbers should read like 0 438 140 xyz. XYZ would be the last digits.

Tony

Originally Posted by boyt911sc (Post 11114075)

Mike,

If you want to find out the culprit of your cold idle problem, take a short video after sitting over night. Show how the engine does its warm up cycle for the first 3 mins. Attach the pressure gauge and monitor the control pressures versus time. Based from the information in post #1, the engine will experience a cold erratic idle specially at this time of the year when it is colder.

Once the engine has warmed up, everything would be normal. And that’s what your video showed up. Thanks.

Tony