81 SC Cold Idle Issue (as in will not idle)

[Kool-aid-82]

Researching same issue.

Tony, is it posible to repair these WUR ourself?
I also have a WUR-090 our of a 81 SC US Spec. reading 9 ohms.
Original to car and never been touched





I read that it is possible to crack these and make them adjustable, do you recommend that?

[boyt911sc]

Originally Posted by Kool-aid-82

Researching same issue.

Tony, is it posible to repair these WUR ourself?
I also have a WUR-090 our of a 81 SC US Spec. reading 9 ohms.
Original to car and never been touched





I read that it is possible to crack these and make them adjustable, do you recommend that?

Billy,

Contact the OP about his problem with his WUR-090. He sent the WUR back to the original WUR rebuilder and came back in worse condition. The cold and warm control fuel pressures were way off from spec and resistance reading was 9 Ohms. The rebuilder insisted there was nothing wrong with it. PM 'Mike in FL' for more details.

A good and properly calibrated WUR does not need to be adjusted seasonally. Making it adjustable makes it only convenient to change or alter the cold control pressure but this is a band-aid remedy to compensate for an existing unknown problem.

Rebuilding WUR's is easy and simple. It is the calibration that takes a lot of time and effort specially if you are working on a WUR for an lambda system.

Tony

[Mike in FL]

Latest update. Recently shipped out and just received back my now "calibrated" wur. Put it back in the car. 25.5 ohms resistance when cold with about 27-30 psi fuel pressure. 9-10 ohms resistance and 51 psi fuel pressure. Car starts right up and idles well cold or hot. Do have some minor idling issues but not related to fuel pressure. Bottom line is that the problem was a non-functioning wur. The supplier in Texas supplied me, one at a time, two rebuilt wur's, none of which were calibrated. In fact, when I questioned them, they advised that calibration was not necessary. WRONG! Sooo, if you happen to purchase a wur from any distributor, make sure to ask if it has been calibrated. An expensive lesson, as is a lot of things with these otherwise super cars... Many thanks to Tony for all of his assistance in this matter.

[Bob Kontak]

Tony,

Do you see wide variations in the WUR resistance for the 090? I do seem to remember 8-9 ohms is a common resistance point for 090 WUR's that are not correct.

Any idea what causes the reduction in resistance?

BTW, I have an old beat up 089 that you are welcome to if you wist to add to you collection.

[boyt911sc]

Originally Posted by Bob Kontak

Tony,

Do you see wide variations in the WUR resistance for the 090? I do seem to remember 8-9 ohms is a common resistance point for 090 WUR's that are not correct.

Any idea what causes the reduction in resistance?

BTW, I have an old beat up 089 that you are welcome to if you wist to add to you collection.

Bob,

Interested in your WUR-089. PM sent.

Tony