I'm running a basically stock K20Z1 (2006 Type S) with 2006 Type S tranny. I've converted the speedo to pick up off the diff. as in the 2002-04 models. It's all in a 95 hatch. When I record my information on the Hondata Kpro the A/F ratio is always at 10.7 to 1 when it should be 14.7 to 1 (this is on the "display" window). If I lean the mixture out, always the same. Closed loop or open, always the same. Any one have some ideas about this? I've contacted Hondata and they said to seek a dealer. I think my closest dealer is over one and one half hours away. I'm trying to tune for fuel efficiency below 4,000 RPM and then maximize power from there on up. I've got it set to flash the CEL should I get knock, but haven't seen anything yet and I've dropped the fuel by 15-20% or so below 4K. I started with the 2005 RSX-S with cold air dyno tuned program and modified that. Any help is greatly appreciated.

 

****UPDATE****

One of the wires on the O2 sensor came unpinned. I reinstalled the pin and plugged the O2 sensor back in. I'm getting an air fuel ratio now, but it always runs lean, but again no knock senor, etc. It's currently running about 22:1. If I play with the fuel trim I can affect it, but I can't get 14.7:1. I've gotten 32:1. In checking the "sensors" window I saw there was no voltage to the O2 sensor and started there, that's how I found the unpinned wire. I'm now getting voltage, but incorrect A/F ratios.

 

Sound like the sensor is bad.

 

 

Is there any way of testing the O2 sensor? Ohms, voltage, etc?

 

Which model o2 are you using 02-04 or 05-06. They're different IIRC.

What voltages do you have in the closed loop parameters? Zero out the fuel trim adjustments as well to see what its truly reading. In my experience, a bad o2 or one with crazy voltages set for rich to lean conditions and vice versa will throw a cel so you maybe in the clear with that