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O2 sensor not working?

14of2000

Well-known member
Joined
Aug 12, 2012
Messages
143
Location
Sioux Falls, South Dakota
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

Well-known member
Joined
Jul 25, 2009
Messages
1,662
Location
Milwaukee, Wi
Can you give a little background on your current setup?
 

14of2000

Well-known member
Joined
Aug 12, 2012
Messages
143
Location
Sioux Falls, South Dakota
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

Well-known member
Joined
Apr 25, 2010
Messages
1,472
Location
Orlando, FL
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.
 

pot

Staff member
Joined
Oct 28, 2003
Messages
1,573
Location
Fayetteville, NC
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

Well-known member
Joined
Aug 12, 2012
Messages
143
Location
Sioux Falls, South Dakota
-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.
 
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