When I start my car, my Scanmaster reads 450-ish, and climbs to 850-900 as I go along. When the car gets warm, the readings just start jumping all over the place. Any number is likely to show up (0-999). However, when I let off the throttle and coast, the numbers drop back down to less than 100. Are my O2 sensors toast?

Oh, I'm running Hooker shorties, !air, !egr, Hooker Y-pipe, no exhaust leaks.
Thanks!!

Fred

 

It's normal for the O2 readings to be all over the place in closed loop and normal driving.

 

hmmm...ok. I was under the impression (by reading the installation sheet and some other articles) that it would stay around the 800-999 range during use. I'd think the wide range of readings during use would make it difficult to tell if things were going wrong.

 

Here is some good reading for you.

 

Thanks!