Hey , im running an autometer a/f ratio guage on my b17a in my EK hatch. The problem is that the guage works exactly how it should for the first 15 minutes of highway driving (Ie: it moves back and forth, etc.) After about 15 minutes of driving, the guage always drops down to full lean and then quits working all together. My only guess is that i have a faulty o2 sensor? Thanks for your help!

www.teameci.com

 

any engine codes?

 

NO codes... which really makes me wonder what in the world could cause this? I mean if the wiring was faulty in any way, it would not work at all. But, like i said before, it works perfect for about 15 minutes and then quits working altogether. I dont know if it makes a difference but im running an OBD1 p30 and i dont know if it checks for "circuit out range" reguarding the o2 sensor? Any suggestions? Please!

 

could it be a faulty o2 sensor?? or is the one you have new?

 

No it is far from now.. it is an old orignal jdm one that came with a swap. Probably a good bit of milage on it, etc. I will try and do the standard tests on the sensor but i would hate to spend the money on a new one that will do no good any help?

 

don't know