Re[2]: ISV & lean running

[steveb@falcon.kla.com (Steven Buchholz)]

> <<<<<<<<<<<<<SNIP>>>>>>>>>>>>>
> >
> >Can a malfunctioning ISV also cause the engine to run lean? Anybody
> >know?
> >
> >Anyhow, thanks again.
> >
> >Graham
> >
> 
> Yes, if the Idle Stabilizer Valve  sticks open, excess air is admitted to the system, which 
> may exceed the FI system's limits. 
> 
> -----------------------------------
> A. D. Morris
> Phoenix, AZ
> allanm@primenet.com
> 1988 90Q
> -----------------------------------
> 
apologies if someone else has already dealt with this one ...

The real answer to the original question is *no* the ISV cannot affect 
the mixture in any way.  Since the ISV does not admit unmetered air to
the intake tract it cannot affect the mixture.  As its name would indicate
it can affect the idle speed when it screws up.

Steve Buchholz
s_buchho@kla.com
San Jose, CA (USA)