Hard start & rough idle when cold

[Bill Green]

Thanks I'll check that valve out. How did you check yours? The only way I
can see would be to pinch off the line to intake boot and see if it makes a
difference. Is there another way? 

As for the frequency valve (potentiometer?) I disconnected the wires and it
did make a difference (for the worse) in how the engine ran and started.
I'll check Bentley for the way to check that and see if I can do it. 
 
Thanks again.

-----Original Message-----
From: Kunz, Bob [mailto:bob.kunz at hp.com] 
Sent: Tuesday, February 09, 2010 5:59 PM
To: Bill Green; quattro at audifans.com
Subject: RE: Hard start & rough idle when cold

Not mentioned yet is the canister purge valve which looks like a vacuum leak
sometimes. I had similar issues and found mine was stuck open. Also, when I
was working this issue ('86 5ks KZ motor) I cleaned the metering plate in
the horn which was causing unmetered air to bypass. Also, did you check out
the frequency valve for function?

--bob
'86 5Ks Avant