A shop that worked on my very straight '82 SC told me that they couldn't get the CIS to adjust because it has vacuum leaks. Before I take the injection system all apart, I figure that I should have everything I need to repair it. I don't believe any of the parts that would contribute to this problem have ever been replaced so I'm planning to replace everything. Here's my part list so far:

6 - Rubber intake sleeves
6 - Injector O-Rings
6 - Injector Sleeve O-Rings
6 - Injector Sleeves
6 - Intake manifold gaskets
1 - Throttle body mounting O-Ring
1 - Airbox to sensor housing gasket

Can you fellow Rennlisters think of anything I may have missed?

 

Got some good ideas from the Pelican boys. How 'bout it Rennlisters? Help a guy out?

 

I would add a couple of meters of the proper size vacuum hose and the airflow sensor boot. I'm accumulating the same pile of stuff for my 81 Zinc Metallic Targa.

 

If so, it maybe leaking:

- at the installation joint (Most installers use an epoxy that is not compatible with the air box platic, so it lifts and creates a leak)
- at the big O-ring

Make sure this is not the culprit before you look at the other stuff. Ask me how I know.

 

This appears to be pretty common issue. Reinstalled the pop-off valve with JB Weld after I ground down the fins around it so the base could be epoxied to the airbox and now it seems to be very solid. Got tons of help on Pelican as well. Man, I've got my work cut out for me if I'm going to keep CIS.

 

All of the suggestions so far have been good, but before taking it all apart, figure out whether vacuum leaks are the source of the problem at all, and if so, where are they? It is definitely worth pitching a shop a few bucks to smoke test the intake system to find out exactly where any leaks may be. The smoke machine at my shop is perhaps the biggest timesaving tool we have, I use it almost every day. I am young, so these have been around since I started working on cars; I don't know how the oldtimers did without em! Carb cleaner is great for simple intake systems where you can see everything, but you can't spray it everywhere on a 911SC CIS system. Have someone smoke test it before you start taking things apart; replacing all that stuff may be a good idea anyway, but perhaps not entirely necessary.