WUR Porsche 911 SC 1982 USA

[Krister]

The original problem in my car is that the car jerks a lot in low gears at steady speed (eg not when applying gas). The fault is identified by a mechanic as being wrong with my WUR, we changed to a WUR with last number 033 and then the car ran significantly better but not completely well (and that WUR was also broken and lost pressure which made the car tricky to start when warm still warm but after like 10 – 15 min since the preassury issue) therefore I ordered a updated one with the same Bosch number as the one sitting on the car originaly (final number 090) but after installed this WUR the car didn't work at all so from above I can only see the options below:
1) There is something wrong with the updated WUR (090) I received and it needs to be replaced
2) I shall not have a WUR with the final number 090 but another variant. The car is a 911 SC Targa 1982 USA Spec
Any thoughts?
Could it be as simple as I need too clean my original WUR? Have not dared to open it afraid to do something wrong….
Thanks for feedback, /Kind regards Krister from Sweden

[Flat6pac]

Check with Tony here

boyt911sc boyt911sc is offline
Registered

Join Date: Mar 2002
Location: Philadelp

Bruce

[boyt911sc]

Originally Posted by Krister

The original problem in my car is that the car jerks a lot in low gears at steady speed (eg not when applying gas). The fault is identified by a mechanic as being wrong with my WUR, we changed to a WUR with last number 033 and then the car ran significantly better but not completely well (and that WUR was also broken and lost pressure which made the car tricky to start when warm still warm but after like 10 – 15 min since the preassury issue) therefore I ordered a updated one with the same Bosch number as the one sitting on the car originaly (final number 090) but after installed this WUR the car didn't work at all so from above I can only see the options below:
1) There is something wrong with the updated WUR (090) I received and it needs to be replaced
2) I shall not have a WUR with the final number 090 but another variant. The car is a 911 SC Targa 1982 USA Spec
Any thoughts?
Could it be as simple as I need too clean my original WUR? Have not dared to open it afraid to do something wrong….
Thanks for feedback, /Kind regards Krister from Sweden

Krister,

Your problem is finding someone who understands CIS. Your car/motor is a ‘82 SC USA Spec. That WUR-033 is a vacuum assisted and has no business being used in your motor. Secondly, you need to find a good working WUR-090. What variant are you talking about?

Unfortunately, you are in Europe and I am in US. I could lend you a tested, calibrated, and rebuilt WUR-090 that you could use in your motor and return it back to me if you don’t want to keep it. And there is no obligation to purchase. Just giving you the chance and opportunity to experience what a difference a good working WUR does to your CIS before committing to buy a replacement WUR.

Tony

[Krister]

Thanks Tony, whats your contact details/mail?

Kind regards Krister

[Schulisco]

Krister,
In the very first step you have to check which components on your car has been replaced and if they fit to the car/engine. Here's an overview for the technical equipment of the different US/JAP SC models:


The problem is - on a CIS car you have to make the troubleshoot step by step and logically. Most owners don't follow the logic how the CIS works and proceed criss cross and in the end they're getting frustrated because they cannot figure out the issues.
CIS cars are not that complicated, but every component works on his own and so it can disturb the rest of the system.
Additionally: Most cars do not have only a single issue, they suffer mostly on 2 or 3 issues. This makes it even more complicated for anybody who's not familiar with the CIS. Best way to sort it out is to get familiar with the CIS by yourself. Are you interested and willing to do that?

To get a very deep and substrancial introduction on how the CIS works, how to repair and adjust, watch attentive the video series from Curt's fabulous YT Channel from Klassikats.com:
https://www.youtube.com/playlist?list=PLkWFofpgz2OgF9FdliKnlzuY0pygqRkMj

Thomas

[boyt911sc]

Originally Posted by Krister

Thanks Tony, whats your contact details/mail?

Kind regards Krister

Krister,

Contact me at boytiongco@gmail.com.

Tony

[PeteKz]

Krister, although your car may be a 1982 SC model from the USA, you need to make sure that the CIS has not been changed at some point to a different system. Lots of changes happen over 40+ years, and it's possible that when the car was imported from the USA, someone got rid of the OXS. Does your car still have the OXS (oxygen sensor) system installed? If yes, then the 090 WUR is the correct part. The 033 WUR was used on mid-1970's cars without the OXS.

[Krister]

Many thanks, I think your onto something here…..the lambda is disconnected and im afraid it will cost me plenty of money to fix that so since the car did run well with the 033 i got a suggestion to try with a 089 which probably is even better than 033 to my car with the lambda disconnected.

Many thanks for advice!

Kind regards Krister

[Krister]

Originally Posted by PeteKz

Krister, although your car may be a 1982 SC model from the USA, you need to make sure that the CIS has not been changed at some point to a different system. Lots of changes happen over 40+ years, and it's possible that when the car was imported from the USA, someone got rid of the OXS. Does your car still have the OXS (oxygen sensor) system installed? If yes, then the 090 WUR is the correct part. The 033 WUR was used on mid-1970's cars without the OXS.

Thanks, yes you are probably right! I missed the information that the lambda is DISCONNECTED and I guess it will be pretty expensive to fix all that stuff, so the car drives well with the 033 and I allso got feedback that it will probably be even better with 089 i`ll try that solution.

Thanks for helping me out here!

Kind Regards Krister

[AndrewCologne]

Originally Posted by Krister

The original problem in my car is that the car jerks a lot in low gears at steady speed (eg not when applying gas). The fault is identified by a mechanic as being wrong with my WUR, we changed to a WUR with last number 033 and then the car ran significantly better but not completely well (and that WUR was also broken and lost pressure which made the car tricky to start when warm still warm but after like 10 – 15 min since the preassury issue) therefore I ordered a updated one with the same Bosch number as the one sitting on the car originaly (final number 090) but after installed this WUR the car didn't work at all so from above I can only see the options below:
1) There is something wrong with the updated WUR (090) I received and it needs to be replaced
2) I shall not have a WUR with the final number 090 but another variant. The car is a 911 SC Targa 1982 USA Spec
Any thoughts?
Could it be as simple as I need too clean my original WUR? Have not dared to open it afraid to do something wrong….
Thanks for feedback, /Kind regards Krister from Sweden

As PeteKz already mentioned, check the other CIS part numbers if they match with the units where the car left the factory in 1982.

Also the Fuel distributor if its the "0 438 100 077" one.
Cause I also have seen US SCs where a total amputation of the lambda components happened. Here people then simply do compensate that by enrichening the mixture via the CO setting screw, ... and the result is also a very jerky driving car, especially at cold starts.

Here's btw all you need to know regarding your model:
https://nineelevenheaven.wordpress.com/the-911-sc-3-0-engine-with-catalyst-and-lambda-control/

[PeteKz]

Krister, drivability problems with CIS are frequently due to air leaks in the intake side. You will want to check carefully for air leaks , preferably by using a smoke tester. Then check your operating fuel pressures.

[proporsche]

Krister..all i can say.is this..You are in the good hands with Tony..
Ivan

[Krister]

Originally Posted by proporsche

Krister..all i can say.is this..You are in the good hands with Tony..
Ivan

Yes, we have direct contact, Tony=👑