[Normy]

Dangler- I have an '85 "Euro" [I prefer the term "S2"] and you can set the CO via a pot on the side of the MAF, but to do it correctly you need a sniffer in the tail-pipe.

[Correctly: EPA emissions correct...that is~]

The manuals detail a procedure where you use a multitester set to ohms to position the pot correctly. 0-1000 ohms; zero is totally rich, 1000 is lean. I have mine set at 900, and my PLX mixture display says that in normal running, I am about 15.0 or so mixture ratio. It varies between 14.0 and about 16.0, so I guess I have it about right. I have a rising-rate fuel pressure regulator [the one from 928 Specialists], and I have it set for a rich mixture. During normal driving, the car runs a bit lean; with full throttle it sits around 12:1, and the performance is perfect.

"Seat of the pants" tuning...

These cars do have an idle stabilizer. It often sticks- pull it off, squirt some WD-40 into it, and put it back in place. The real reason that S2's and other 928's idle funny is either because the Nology plug wires are interfering with the throttle cable...or there are a bunch of vacuum leaks.

N!