Air fule ratios

soulstealer1984 · Post by **soulstealer1984** » Thu May 14, 2009 7:39 pm

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’m sure the reason for the second error code is the fact that i do not have a CAT). I disabled the emissions check for the secondary O2 sensor so I no longer have that code but it didn’t change the fact that I don’t have air fuel ratios. I would assume that if my primary O2 sensor was not functioning I would have an error code for that sensor.

I cannot think of anything to do to fix this issue if anyone has any suggestions it would be greatly appreciated.

Post by **Hondata** » Fri May 15, 2009 7:16 am

The S2000 uses a narrowband o2 sensor. The AF will not read. The o2 voltage will read, and you should also look at the short term fuel trims.

soulstealer1984 · Post by **soulstealer1984** » Fri May 15, 2009 9:15 am

Ok thank you for you response

soulstealer1984 · Post by **soulstealer1984** » Fri May 15, 2009 3:42 pm

One final question in reference to this, what wide band O2 sensor should i use for my car.

Post by **Spunkster** » Fri May 15, 2009 4:21 pm

Anything for PLX devices will work for you input in to the ELD input