Fw: Justa O2 Note

[Terry]

EFISYSTEMS at aol.com wrote:
> 
>  This is very true,,,I just spent the last six days datalogging a 99 chev
> truck and have seen the AFR vary from 14 - 15:1 while in closed loop and is
> intentional to reoxygenate the exhaust stream to further burn HC's since air
> pumps would mess up the O2 sensors.....
> -Carl Summers

Interesting... My cat is a 3-way type cat and I would assume that 
they would have just triggered the AIR relay to inject more air 
directly into the cat...   It bypasses the O2 sensor in this
case....

T.