I have a 2004 s2k. I just have 12.5:1 compression pistons bored 3mm over with stage 3 Brian Crowler cams duel valve springs with titanium retainers. I also installed the k-pro ECU.

Everything is installed and the car starts up and runs with no problem. However i have been unable to get any air fuel ratio readings. The ratio stays at a constant 14.7 never fluctuates at all even if I raise the over all fuel trim. The only error code I am getting is for the rocker arm oil pressure switch and one for the secondary O2 sensor (I

 

are u running a wideband o2 sensor or did u tap ur existing stock o2 sensor for ur readings
PS. isn't 3mm over like a huge amount and will take out the FMR layer

 

why not just buy an independent sensor, I have the autometer Cobolt AFT gauge, its great

 

if u are pulling readings off ur stock sensor that is no good, its not a wideband sensor so it will give u incorrect readings.. u have to have a wideband added..

 

On my integra gsr it was having same issue like that too. the a/f would started at 14.8 and then 5 second later run all the way out to lean and just gone. but it was fix because it was the wire issue that i did wrong. what brand did you go with?

 

im just tapping into factory O2 sensor. I was under the imprssion from hondata that that would work but that makes sence thanks.

 

I think it should still move, it's just not accurate anywhere except right around 14.7.

 

its not even close to being acurate, hooking up a stock 02 sensor to a gauge is just a light show when your moving...

 

a stock o2 sensor is a narrowband...you want a real wideband...wideeeee see??? a stock 02 will read basically as a yes or no. but a wideband will give you a wideee reading...and also it will have a simulated narrowband output that you can feed to a stock ecu,etc.