OK so heres the story. I have an '02 with CAI, VAFC2, header, test pipe, and exhaust. I've got a wide band afr gauge along with the vafc, so i dont have either o2 sensor hooked up. I do have it set up to run a little lean. Yesterday I scanned my car for a cel i've had for a while now, and got, besides the o2 sensor issues, misfire on all 4 cylinder and a random misfire. Does anyone think these mods could throw these codes, or is it something thats needs an adjustment. There is a little rough idle after i let off of the gas, like when coming to a stop. But other than that it runs fine. Should I pull it all out?

 

The rough idle is probably not coming from your tune because the vafc only controls WOT and not partial throttle. The mods would be bad. How lean are you running? Do the cel come one after you have been redlining?

 

Honestly I cant remember when it came on, and its running anywhere from 14.6-16.2:1 depending on throttle position and RPM.

 

14.6-16.2 ??? That would be... a huge problem

And let this thread be a reminder why you always take care of CEL's and don't leave them on, so you don't have long lasting CEL's that you never knew about.

 

Whats bad, the range or how lean it is?

 

How lean it is... 16.2 is very lean.

 

You have to have the 02 sensor hooked up. I had this issue as well when I unplugged my 02 sensor. The ECU needs the 02 sensors.

 

Are those afr's wot? Or is that idle to letting off the throttle? WOT in vtec is the most important thing for afr's. If you are 16.x wot in vtec yeah that is not good lol.

 

No the 16's are while crusing. WOT in vtec is around 13 or so. Which O2 sensor is the primary, white or blue cord? I just plugged the one with the white cord back in and took it for a drive with no correction running on the VAFC. It didnt seem like the addition of the o2 did much, but the afr's are running around low 15's idle and mid-15's while driving.

 

Well 16 cruise or idle is fine and 13 is is good. Thats not lean at wot. Hum... When was the last valve adjust you did on the engine?