O2 sensor not working?

[14of2000]

So since I did my motor swap into #222 the cel light pops on randomly, normally when I'm crusing at the same speed for 2 to 3 mins or so. When I pull a log for it on the datalogger my low/mid/high fuel trims are at 100% all the time no matter what. The o2 sensor is maybe 3 months old, so I doubt it would be bad. I am pretty new to using the logger, what else should I check for?

 

[MellowVR4]

Can you give a little background on your current setup?

 

[14of2000]

Ya I guess that would help huh? lol I have Rc 550cc injectors, a keydiver chiped Ecu, Walbro 255, 2g maf. I thought the chip is just making it do this, but is that possible?

 

[AnotherNewb]

Have you checked for boost leaks yet? Is the O2 sensor switching when you pull up the data streams? Those are the first things I would check.

 

[14of2000]

I just recently boost leak tested it and I don't hear a leak anywhere, with the logger?

 

[pot]

A couple things (provided you don't have a boost leak)

- Have you verified the chip you have is set up for what you have on the car
- Are you using 91/93 Octane fuel
- Is all O2 sensor wiring intact
- Have you removed the O2 and inspected it for excess carbon buildup, glazing
- What brand O2 do you have
- Have you ever replaced your coolant temperature sensor

 

[14of2000]

-Yes the chip is burned for the 550s and the 2g maf
-I am using 91 and when I can find it out here I use 92 octane
-The o2 sensor wiring is intact, Ryan (prove_it) rewired it for when when I got this car
-I have not removed it yet, I haven't had the time since my baby came, and this is my daily driver. However I am going to be installing a 7cm exhaust housing soon, so I will definaltey check it out then. It is a Bosch o2 from advance auto
-And yes I replaced every sensor with oem ones when I first got this motor.