After getting Walbro fuel pump in my car has been running funny. On my Datamaster i can see that my left O2 sensor was pinned to 1080-1100 all the time. I also noticed that my A/F ratio meter wasn't working. So after connecting it and disconnecting the A/F with two different O2 sensors, i came to fact that the A/F ratio meter was makiing the O2 sensor read 1080-1100 all the time.

But now that i disconnected the A/f ratio meter the O2 is acking weird still. It mostly read the opposite from the right O2.

The numbers are jumping all around and are not following each other. Hard to explain. Left is always lagging behind in # or just higher then the right.

If you have datamaster i can send file but, any ideas to look at?

 

Except at WOT, the O2 readings jump around continuously.

 

Not jumping but down by 100 compared to the right, @ WOT.

It jumps when criusing or idle

 

Swap O2s and see if the trouble follows the sensor. If not, you probably have an exhaust leak or maybe even a fuel delivery problem.

 

Well i did swap out two older ones i had 2 years ago and swaped out all three and all three worked the same?