I don't know if my plx m-300 is reading properly. The display fluctuates between the readings 00.00, rich and 14.67, but mostly it show 00.00. I haven't tuned my b16 turbo set up yet, and I'm using a hondata ecu.

 

Did you cut any of the wires or anything? The PLX shouldn't go as low as 00.00. I think after 10.0:1 AFR it just reads rich.

You may have to send it back to have them fix it.

 

do you have a noise filter?

 

Nothing cut and no noise filter.

 

try installing a noise filter.. look at the online manual @ http://www.plxdevices.com and search filter in the m300 install guide... it'll give you some information about it.