Noob CIS question
 

Could someone please identify the fuel injection component located directly in front of the #5 injector? WUR?

The subject is a newly purchased 80 SC, 87K miles. Car has been garaged and driven only 9000 miles in 14 years, I'm sure the lack of use is half the issue. Trying to track down the cause of general poor running/miss. Passed leak down with flying colors. New NGK plugs. Distrubutor cap and rotor pretty crusty, new ones on the way from our host. Magnecor plug wires are likely 20 years old. Didn't see any arcing, new plug wires on the way anyway. Pulled the injectors today to check pattern and really expected the problem there, but flow and pattern look good. They were pretty loose, so new O-rings for the injectors tomorrow.

The device in my initial inquiry had a fairly loose vacuum hose coming into it on its left side, which I'm sure doesn't help.

The WUR is bolted to the runner on #2.

Some SC WURs have a vacuum line, some don't.

Vacuum leaks are a good bet, if you have access to a fuel pressure test kit, that is the main job of your WUR. If your cold and warm pressures all look good then your WUR is probably ok.

#5 is the . . . . decel valve? Can't remember. Someone will chime in.

Many folks unhook the vacuum line to decel valve because it's not necessary unless you want the car to be 'stock.'

the AAR is on the right side (from the back of car) bolted to runner #5. No Vacuum line, just a 1/2 hose going in and out supplying cold start air.
WUR is on left (drivers side) bolted to runner #2, has a vacuum line on top and going into the base on the left.
Cylinders are numbered from back of car, 1,2,3 on left, 4,5,6 on right.

911 CIS Primer - Index
Take a good read of this site. It is invaluable for CIS cars.

I know L-Jet inside out, and K-Jet not at all. On an L-Jetronic car, a leak at the auxiliary air regulator will prevent the flap in the airflow meter from opening properly under load, creating a lean mixture. Would the same not hold true here?

Great primer. I'll study. Thanks!

Timmy2 has given you the information you need.

Since you are trying to get a long idle, poorly running car back into shape, I'd suggest you get the ignition system taken care of before tackling the CIS. Do your CIS research, but wait until your new ignition components are installed and you are certain that system is up to specs. Then, if the problems persist, trouble shoot the CIS. Be sure you have a fuel gauge set that will work with the CIS as a basic tool. Whatever you do, keep your diagnoses and testing orderly and methodical and report your results to us. Feedback is your best friend.

Good luck.