[Diy_efi] IAC whistles at idle

[Torbjörn Forsman]

Is it a GM (Rochester) TBI unit you are using? On those, the IAC usually 
  is flange mounted to the TBI housing and secured by two torx screws.
Don't try to disassemble the IAC unless you have plenty of them laying 
around and can sacrifice one or another.

Best regards

Torbj?rn Forsman


Stew Pididiot wrote:
> I have a new TBI application on an old bronco with a 302 in it.  The 
> vehicle
> runs well most of the time, but sometimes will stall at idle.  The stalling
> seems to occur after periods of start & stop street driving involving low
> (<50 mph) speeds. It runs well at highway speeds, and idles nicely after
> freeway runs.
> 
> I've noticed that the engine has a high pitched whistling sound at idle.  I
> say "whistling" because it sounds like air, not a mechancal sound.  The
> whistle will go away if I jsut rest my foot on the gas.
> 
> I'm guessing that there is some carbon or other debris in the IAC such that
> in certain modes (e.g. closed) its motion blocked by the debris.  Could 
> this
> be the source of both the stalling and the whistling?  If so, what is the
> best method for cleaning it?  It looks like it requires a specialized 
> too to
> remove it, is there another way to safely remove it for cleaning?
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