02 voltage doesnt change

[anchew02]

so i bought a palm with logging software... i love it problem is now i think ive opened pandoras box of problems i never knew i had. first my 02 voltage stays at 2.77v never changes. i had 5 counts of knk just normal driving what do you guys think..

 

[gofer]

If its a narrowband o2 sensor (0-1v) I'm not sure how it would get stuck at 2.7v, either way if its stuck and not cycling its bad. If its a WB o2 sensor and its stuck it could still be a bad sensor or you've got a loose connection somewhere. It also sounds like you're getting PK (phantom knock) which is from a bad knock sensor, a loose knock sensor, or a downpipe rattling on the oil pan.

Please use capitalization in your posts, its tough to read when it looks like a 1st grader wrote it.

 

[Fehrion_sit]

Gofer is right, a normal o2 sensor on dsms should cycle up and down between .200v and .800v as the cars idles from lean to rich. if your computer was reading 2.77v from the o2 sensor you would have CEL light for sure. the knock sensor could be any of those things, check the knock sensor to make sure its installed correctly or replace it, easy way to test it is a take a hammer with the key on and palm reading data and gentle tap of the outside of the block, NOT THE HEAD, its aluminum, you should get a reading from the knock sensor ... or try a higher grade of gas


-Fehrion

 

[anchew02]

I disconnected the o2 sensor to see if voltage would change and it didnt,even with the car running no voltage change. I was thinking about just replacing the sensor anyways because i dont know if its ever been changed. The o2 is the factory narrowband sensor but you would think it would set a cel for that, the only code i have is for my egr sensor

 

[Fehrion_sit]

i dont think that is your problem, i think your logger is displaying another data point, because 2.77v is not even remotely in the troubleshooting range of an o2 sensor, it almost makes me think the logger is looking for an AFR reading and because it is not seeing one, it is displaying a neutral reading