Another, whatthejeebsisthisthing thread

[paslantnose]

Hey guys, i found this thing while mucking around today.
It looks to me like there's supposed to be a vacuum line attached but no lines laying loose anywhere near it ???

Should the fitting have a vacuum line and where would said line go to?

[paslantnose]

Somebody must know what this thing is or more importantly, if there is supposed to be a hose on the fitting ???

[klaucke]

That is your warm up regulator, commonly referred to as a WUR. And yes I believe a hose does go on that, however I'm not sure where the other end goes.

[paslantnose]

As i do not yet have a repair manual, my only recourse at this point is to ask these questions and look like an idiot.

thanks klaucke

[SC-targa]

Because you have a red fan shroud, I'm assuming that you have a 930, 78-79 SC or a Carrera 3.0? My 82 US model SC doesn't have that vacuum port on the side of the WUR.

Regards,

Jerry

[paslantnose]

It's a 1980 911SC 3.0

[yelcab1]

No vac on that port. The 80SC does not even have that port. Yours must be a replacement from a different year. Just ignore it.

[Scott R]

Originally posted by paslantnose
It's a 1980 911SC 3.0

Then you have the wrong WUR on that motor. The 80' SC WUR does not have a vacuum port on the side. Look on the top there will be a Bosch number, post that up and I bet your WUR is from a 77 or 78.

[javadog]

Okay,

I have forgotten which car you have but I'm going to assume it's a '78 or '79 SC. The hose goes to the "thermo valve" as our buddies at Porsche call it.

Look for a round thing under the blower for the heating system. It'll have a couple of hoses plugged into one side.

JR

Edit; While I was (slowly) typing, I see that you posted that you have an '80 SC. I second the notion that the WUR is the wrong one.

[paslantnose]

Hmmm, the plot thickens.
Will having the wromg WUR cause any problems?

[Scott R]

Originally posted by paslantnose
Hmmm, the plot thickens.
Will having the wromg WUR cause any problems?

It did for me, I had the same issue on my 80' the WUR the PO had installed was a from a 77' My cold control pressure off and caused me some some rough startups, of course that's a small issue when you consider that he had it plugged into the wrong plug as well.

[Ads912]

It depends on which version of the WUR that you have.
Some have the connection to the atmosphere on top and vacuum connection on bottom, others have it reversed.
Your lower unconnected port may just be a vent to the atmosphere, with no hose required.

[cmonref]

That WUR is what came on a EURO 1980 SC.

pslantnose: does your VIN start with 91A0 ... ? If so, it is a Euro.

If you have a Euro, a vacuum hose goes from that port you pictured up to the thermovalve, (above and behind your WUR and under the heater blower). A vacuum line from the other port on the thermovalve goes to a port below the throttle plate on the throttle body.

[paslantnose]

The VIN does indeed start with 91A0.
I tried to do a VIN search before but never got any results because of it being 10 digits.
I'll have to check into this thermovalve and see if that is there.
Brian, I believe what you're saying as it being euro, is there any way for me to confirm this?

Thanks to all who have been babysitting me through my problems, you have eased my worries on this first p-car venture of mine !

[javadog]

Any 1980 SC serial number should start with 91A0. Take a look at the following table and compare to your car:

serial number range engine type number
ROW SC 91A0130001-4831 930/09
USA SC 91A0140001-4272 930/07
JAP SC 91A0130001-4831 930/08

Let's figure out what car you have, then we'll get back to figuring out what you should have on your engine.

JR

[paslantnose]

The VIN is 91A0143230
Guess it's USA after all, thanks for clearing this up JR.

[javadog]

Okay,

Now that you know what your car is, let's figure out if your engine is the correct type for a US SC from 1980. The type number should be 930/07 and the serial number range should be 6400001 or higher.

The WUR that should be on your car is part number 911.606.105.07 or 911.606.105.10. It might have a Bosch number of 0438.140.072. It will look like this:



The WUR for the '78 and '79 SC was 911.606.105.05 or 911.606.105.06 which superceded to 911.606.105.09. Bosch numbers might be either 0438.140.045 or 0438.140.069 or 0438.140.089. It will look look this:



I'd suggest you figure out what you have and then we'll decide what you ought to do next. Have you had you fuel pressures checked lately?

JR

[Jadams1]

Here's a picture that shows were the hose is connected. It engine is a 1980 ROW SC, #6300427, type 930/09.

[Paulporsche]

Are you running the O2 sensor/DME? If so, they control the WUR functions that the vacuum did on previous versions, so that's why there isn't the same hookup on the 80 and later WURs.

You can check WUR function by checking your control pressures w/ a fuel pressure gauge. A search will yield a huge amount of info on the WUR. There are also a couple of system schematics in the tech area.

Or, if your car is starting, warming up, idling and running correctly, with no pinging under acceleration, then all is probably OK.

I have no emission control/DMD/O2 sensor on my car w/ an 80 engine, so I use the earlier type, which mainly allows for greater enrichment under acceleration provided by the vacuum.

[paslantnose]

The only thing I see wrong with the way the car runs (bear in mind, i have no comparison), is on cold start up it will "fast idle" to 2500 rpm for about 10-12 minutes or so.
I know this rpm is too high and from what i've read, the AAV is the probable cause.

I have not done any pressure checks (no gauge yet).
A pressure gauge and repair manual are next on the list.

This car does have the lambda system (unplugged).
I will check the WUR pn asap.

Muchos Gracias to all for the help !