Need help, anyone with a CIS degree and familiar with Audi ignition systems

[Huw Powell]

> So what you are saying is that it might not rev up because the Idle
> switch is not giving the computer any kind of a signal at all?

No, what can happen is if the idle switch is not opening, the CIS-E will 
limit the revs (its a way of dropping them efficiently when you take 
your foot off the gas).  When it is closed, it tells the ECU to idle the 
engine with the ISV.  If you don't have one, you're going to have some 
issues to fight.

Also, you mentioned no WOT switch.  That switch takes the system out of 
closed loop and enriches the mixture, so it can be good to have.

> I've
> been working on the vacuum leaks and think I have that traced I think
> it is the little pipe that sticks out of the side of the head for the
> air shrouded injector thingy...hopefully but won't be able to fix it
> until later tonight..  I have an A&P test....    So possibly if I
> plug in the idle switch it may change things...  It does hesitate
> when I open the throttle  kind of a buh buh buh bruuummmm...

> One other thought is that I have a pretty long stretch of Intercooler
> piping and a rather large turbo inlet pipe fron the CIS head  is it
> possible that I have too much volume to lift the flow plate????

I wouldn't know as much about that, but I suppose the volume would 
certainly delay the plate's response a bit.

Also, with a turbo on there, and a funky cam, you probably aren't going 
to get complete "drivability" (smooth idle, smooth power curve, etc.). 
I assume that down the road you are going to throw on a more appropriate 
engine management system?  Or are you going to stay at low (5 psi or 
so?) boost and let the CIS-E keep running things?

So after you get the leaks out, let us know the ignition timing, and 
also how the CPA current looks at idle.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/