CEL light after downpipe install??

[Sic95gst]

I installed a Tsudo DP that elimiates the cat. Has this thrwon a light for anyone else? I also think my o2 sensor is going because my air fuel ratio gauge has stopped working right before the DP install. I just wanted to know if this happened to anyone else? Thanks for the info in advance.

 

[ddavisaf]

Your O2 sensor with definatly set off a code. Replace it then clear the codes. Any AutoZone or Advanced Auto Parts or whatever they call 'em near you will run a codes test free of charge.

 

[Sic95gst]

I had a tech here at my work check out the code and he said it was the O2 voltage is too low causeing it to run way lean and now it is stalling out occasionally. I'm ordering my o2 sensor tomorrow morning so it should be all good after. My o2 sensor seemed like it was going bad about 2 months ago so maybe with no cat it just pushed it over the edge. I'll keep you guys posted on the results. Thanks again.

 

[CyberEye]

Did you're straight pipe that eliminates the cat have a bung for the secondary O2 sensor? If you got rid of the secondary O2 sensor that is right at the cat, that is the cause of your CEL.

 

[Sic95gst]

No my cat back exhaust is where my 2nd O2 sensor is and it is in there. My downpipe did elminate the cat, I just have a bad o2 sensor and my tech said that it is causing the computer to limit the amount of fuel so it's running lean and can stall out. Ordering my o2 sensor today from work, and having a tech put it on when i get it. I'll let you know if it works. Also if anyone else has any thoughts as to what might be the problem please just let me know because i would like to just make sure it's not just a sensor.

 

[ddavisaf]

I'm pretty sure it's just a sensor We'll find out soon

 

[Sic95gst]

Ok sensor is installed and CEL is cleared. Car is running fine, but my Air fuel ratio gauge is still reading all the way lean, WTF?? Could i possibly just have a gauge that stopped working, it has been acting funny right before my O2 sensor went bad. Any input would be helpful.

 

[Sic95gst]

I just found this http://www.roadraceengineering.com/newafcsetting.htm , i was looking at the 2g stock fuel settings. Does +50 at 1k sound right? tuning with the SAFC is new to me and that's why i haven't touched it yet. Do these numbers sound right for the 2g fuel settings? I think i should give it a try before paying someone else to do it. Also will the Blue wire mod work with a safc2? To me this may be better then haveing a a/f ratio gauge.