I am running a PLX M300 with my EMS 1012 on my turbo S2000. After setting the gain so the voltage equals 2.35vdc, the voltage slowly drops down to 2.14vdc.

In addition the a/f reading on the PLX meter versus the EMS reading is 2 points off.

I have the white input wire of the PLX tapped into the O2 wire on the EMS, per the instructions on the PLX site.

My tuner (timg) was having a hard time tuning my car because the a/f readings were so far off on the EMS.

Has anyone else experienced this problem? If so what did you do to fix it?

Any help is appreciated. I am going to try to solder the power, ground, and input wire instead of using taps.

 

I have the PLX 500 and there are some feutures that I believe they need to be calibrated, not sure. The PLX site has alot of info and even forums, you can check them out. Maybe the location of the O2 can be an issue also.