Cold weather driveability issue
 

Hello all, I have posted this question on the Rennlist site but the issue is not resolved and I thought I'd try here. I have a 1983 911SC ROW which I purchased in August of this year. The engine runs strong and up until the temps in central Ohio have fallen I didn't realize that the enrichment and elevated idle speed systems were not working. The car starts fine, but idle is low and sputters till it gets warmed up (usually within a few minutes). I have ordered a fuel pressure test gauge to access static, cold and operating temperature fuel pressures, but I thought I would post what I know so far and get your advise on how to proceed. First, I have confirmed that I have 12VDC at the WUR and at the AAR. I have also measured the resistance at both components. The WUR is 27ohms and the AAR is 21ohms. I pulled the AAR and observed that the valve is about 50% open when cold. I connected 12VDC to it an observed that it would fully close in approximately 2 minutes. I then put it in the freezer for 20 minutes to reset it back to its initial state. I have attached a picture of the WUR which I have a few questions about. First, I see a yellow electrical connector on the one fuel (return line?) coming off the WUR. Any idea what this is for and why it isn't connected to anything? Second, I ran accross a post from 05.15.2012 on this site from Vereeken in Belgium with a hand drawn picture of his enrichment circuit and see that there is a thermo valve in series from the WUR to the Decel valve. I don't have a thermo valve on my car, but I do have a tee coming off the decel valve with a 2nd piece of vacuum hose coming off it that is plugged at its end. If I had to take a guess I'm thinking that somewhere in the past the valve had been removed and the line plugged. Does this seem like a reasonable assumption? If so, do I need the valve and where does it mount? I'll have the fuel tester next Monday so I can speak about fuel pressures then. Any advise would be appreciated. Thanks, Warren http://forums.pelicanparts.com/uploa...1349880422.jpghttp://forums.pelicanparts.com/uploa...1349880863.jpg

Do you realize you posted this in the Engine Rebuilding forum (as opposed to the 911 forum)?

Any chance you could post the part number on that WUR?

Sorry about that. I moved this post to the correct forum.