air pumps

[Scott Shotton]

bruce plecan wrote:
> 
> ref: Carl Summers   7730 Air Pump
> Last material I had was that during warm up the air pumps
> "air" was injected at the exhaust manifolds to help with
> "afterburning" the rich cold start mixture, this was to quicken
> the heating of the O2 sensor.  Once "warm" (coolant temp)
> the ecm would switch the air valve so that the air pump
> discharge was diverted to the center section of a monolithic
> converter, or upstream on a pellet type converter.
>   With the O2 cold there would be no "readable difference"
> in O2v..  When warm it would be downstream, again no
> O2 difference.
>   The only connection my diagram shows is F2 for grounding the
> air select solenoid, so I'd venture a quess of 200 ohm resistor to
> 12v would solve that.   Might double check the OEM solenoid's
> tend to be 90 ohm.   Generally doubling the resistance has worked
> for me, on other items, to turn off diagnostics when code not
> available.
>   Any one else's input?.
> HTH Bruce            Flu season warning: cone shaped hats
>                               do not resist virus or bacterial transferrs


The other air pump "mode" (if you will) is to dump.  Especially during
cold decel.  Lots of HC mixed with air (O2) in an exhaust manifold
starting to get hot=  exhaust manifolds blowin off the sides of the
block.

What Fun!