[Schulisco]

Originally Posted by 801coppertop

Thanks for the well thought out response Thomas.
1) Yes, I have verified mixture while driving. I have a wideband o2 I use for tracking AFR.
2) I have an Autel Smoke testing machine, I have pinpointed quite a few leaks in the past with the machine. Works quite well.
And I agree, my symptoms are consistent with a vacuum leak. Which has led me to check multiple times, I suppose the good is I have gotten pretty quick at the process.

I will try resetting the adjustments to baseline following your instruction and report back.

Curt from klassikats.com has released some very interesting videos on aircooled Porsches, esp. also to the CIS on a 2,7 on which the CIS is basically the same as on the later 3,0l SC models:
https://www.youtube.com/playlist?list=PLkWFofpgz2OgF9FdliKnlzuY0pygqRkMj

The whole series is very informative, but I want to point you on this one, at the very end of it he also explains the procedure of the basic setting the CIS with a little difference - he opens a supplier line to one cylinder instead of hearing the injection begin with all connected lines. I don't agree to that because you change all other cylinders pressure conditions...but he won't show it this way if he won't succeed that way too:

https://www.youtube.com/watch?v=K-OvjlkrgNo&list=PLkWFofpgz2OgF9FdliKnlzuY0pygqRkMj&index=4

The sensor plate height setting always has to be seen in conjunction with the injection begin of the CIS!

Concerning vacuum leaks - also be aware about the airbox itself - it can be the source for vacuum leaks too...if in question replace it with a new one, they're available from Porsche again...

https://www.youtube.com/watch?v=H_SAcKXJlL0

Oh, BTW sb reported this year a vacuum leak on the oil filler cap....there's rubber seal which also may fail over the decades...also not to forget both rubber diaphragm valves (deacceleration and start valve)...

Thomas