Had my digital a/f gauge hooked up through the rear o2 sensor and was working fine. Bought a new computer installed evoscan using the same formula and it will only log a flat 10afr through out the entire rpm range.

Any ideas? Have to do with a newer version of evoscan?

 

what formula are you using?

 

0.03913*x+10.3

 

Are you using 3C for the request ID?

 

and pin 73 for an evo9 and 75 for an evo8

 

i was never able to log my uego through the ADC for whatever reason...made a sserial cable for like 7 bucks, and have had great success with keyspan serial to usb adapter and windows 7. data resolution is very good.

 

From what I gathered from the OP, the only thing that has changed seems to be the installation of EVOscan. Are you sure you installed it correctly? Is everything else logging the correctly?

---Make sure your AEM wideband gauge display isn't really showing 10:1 afr (ie dont just look at the logs) ! then you actually have an issue..

Also did you change any of the wire locations of your AEM -> rear 02 input? If you moved any wires (ie move ground, change resistance..) this may require some tweeks to your formula. But this does not seem to be the case if it is truley a flat 10 afr throughout the logs.

 

Yes only thing I changed was the Installation of evoscan on a new computer. Request id is 3c.

 

Okay.. What does it read when your at idle? Also could you just put "x" for the function. And drive around and tell me what kind of numbers your seeing, this will tell us a lot.