RE: timing quirks; and other sundry

["Dupree, Jim" <dupree@alldata.com>]

Huw,
What year is your coupe?
Some of the Audi's had a Digital Idle Stabilizer that advances and retards
the ignition timing to control the idle speed. It has a limited range that
it can adjust with-in  (8or 9 degrees?) and if you raise  or lower the base
idle speed enough it will sit at one end or the other of its range. If your
car is equipped with one , the proper timing procedure is to disconnect and
bypass it and then adjust timing, idle speed and fuel mixture. I believe
this was eliminated with the introduction of CIS-E in 1984 but I would have
to look though my Bentley.
Jim Dupree

		-----Original Message-----
		From:	Huw Powell [mailto:human@nh.ultranet.com]
		Sent:	Monday, April 26, 1999 11:42 PM
		To:	Audi Fans
		Subject:	timing quirks; and other sundry

		I took the timing light to the sorta-tweaked cammed coupe
tonight, it
		showed I was basically at 6 deg BTDC with lots of power.
Advanced it to
		about 15 or so, remixed, it is a bit smoother but has lost a
bit of
		torque and some high end pull.  Going back tomorrow... 

		Question - when measuring it, esp. at the 6 BTDC the mark
would
		fluctuate, almost in time with the OXS cycle, to points
about another 6
		degrees or so ahead.  It didn't seem to do this at the more
advanced
		setting.  This is with the dist vac adv hose pulled.
Answers?

		Has it occurred to anyone that using the brakes on a vacuum
assist car
		will momentarily lean out the mixture as the vacuum is
replenished from
		the intake manifold?

		-- 
		Huw Powell

		http://www.thebook.com/human-speakers

		82 Audi Coupe; 85 Coupe GT
		http://www.nh.ultranet.com/~human