[boyt911sc]

Originally Posted by spuggy

Chap in this thread said it was pretty easy to remove CIS without even a partial drop on his '74: http://forums.pelicanparts.com/porsche-911-technical-forum/717648-finding-cis-vacuum-leaks-vacuum-cleaner-pressure-test.html

I doubt it gets easier on later cars - and no idea what year you have.

Spuggy,

You could remove the whole CIS unit in situ, or partial, or complete engine drop. There is no right or wrong procedure. It is a choice. I've done it different ways and I prefer doing with the engine out.

Read Thomas adventure trying to locate the illusive air leak/s in his engine and how long he has been battling to fix it. I like to remove the engine and run the motor before putting it back in the car. The time and effort involve is much less than doing the troubleshooting with the engine in the car.

One advantage of running the engine on a test stand is the complete access to the engine, easy to spot air, oil, and fuel leak.

Tony