4kq IAC Sucking

[Huw Powell]

> Got a quick question about the IAC on my car.  The rubber elbow from
> the intake to the IAC is getting sucked shut during idle.

That is fairly normal, and it's also partly why that hose seems to crack
quite nicely, when old enough.

It's sucking flat because of engine vacuum - and it's a good sign you
don't have any leaks, I suppose.

Also, I think what you are referring to as the "IAC" is sorta normally
called the "ISV" (idle stabilizer valve), but I bet there is an even
more official "real" name for it... I'd be even willing to bet that
*you* are using the correct name... but it was a bit confusing for a
moment!

What percentage duty cycle is 15 degrees on the V8 setting?  Sounds like
almost nothing... 1/8 of 1/24? There might be a spec in your Bentley for
idle duty cycle - adjust your idle screw to achieve the correct setting,
it should help make cold idling, etc, more predictable.  I know on the
CIS-E3 cars (NG at least, 90Q) it is 27 degrees - which is almost the
lowest it will allow anyway.  Maybe I misunderstand or miscompute 15
degrees on a V8...

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/