4kq IAC Sucking

[griz]

I just went out to check mine and it does it quite nicely,
being cracked that is. Put a few wraps of electrical tape
and it then sucked closed. ( Tape is tempoary, btw. )  
I was thinking about putting a short piece of pipe/tube 
inside to keep it open, or is it supposed to close like that?
Dennis
86 4kq

Huw Powell wrote:
> 
> > 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/