Re: O2 sensor readings

["Graydon D. Stuckey" <graydon@apollo.kettering.edu>]

On Tue, 17 Aug 1999, Brian Devlin wrote:

> >except for those two middle readings all seems ok.  How do you get 1-2k
> >and > 2k rpm with the "throttle closed", btw?
> Thats decelerating (Graydon-I usually idle at 700-800). I'm thinking 

That makes sense.

> the change in mixture at 2000 rpm has something to do with the 
> jerking, but what could be the cause?

If your O2 sensor is in good shape, it shouldn't cause jerking.  I can 
get it to do that with user programmable EFI, but that's only if I get 
the O2 feedback parameters screwed up royally.

> BTW, I thought oxygen made voltage, so 0.7 would be lean?

No, low voltage is lean, 0.5 v = 14.7:1, and high voltage is rich.  BTW, 
on the I-5 turbo engine, about .8 is good for max HP.  If you start to go 
to .9v, that gets too rich and torque drops off.

Later,
Graydon D. Stuckey
'91 V8 Quattro 5-speed		'86 Mazda RX7 TII+2
I have a new exhaust systems webpage - check it out at...
http://www.geocities.com/MotorCity/Factory/8023/index.html