Wide Band O2 Sensor Training Material

draser · Post by **draser** » 13 Nov 2014, 10:56

For those interested there's this nice training material on the subject:
http://wps.prenhall.com/chet_halderman_ ... index.html
You'll need powerpoint to open.

importCar · Post by **importCar** » 22 Nov 2014, 00:16

Thanks for the interesting material.

I am trying to make sense of a lambda reading as attached. Any comments? This happens only when car is in gear, rolling.

: uploadfromtaptalk1416640567500.jpg (54.08 KiB) Viewed 759 times

draser · Post by **draser** » 22 Nov 2014, 08:40

Lambda less than 1 is when your mixture is below 14.7 air/gas ratio, so you have less air - running rich. If you see that as a rule with car rolling steady you should also see your long term fuel trim in double digits. Look for ignition issues, misfire, leaky injector. Pull the plugs to pinpoint to a particular cyl. Could also be maf over reporting, I'd start wirh this. Sensor seems to switch but I can't tell the timescale, i.e. how fast it responds.

importCar · Post by **importCar** » 22 Nov 2014, 10:14

Thanks for the reply.

Most time, my car report rich mix, but those elevated readings made me confused. I will check plugs since the car tends to stall when put in gear when engine is cold.