front o2 low at idle

[justin0469]

So I'm just gettin into tuning but this is my problem. My front O2s cycle normally cruising at highway speeds. But when at idle, they are low, around 0.02-0.03V. I've raised my fuel map up to 5% more at idle but doesn't change anything. Do I just have to keep going until it pushes it into the closed loop or is it something else?
Also, I get at most 0.23V of knock throughout the RPM range, is this something to worry about? What is the voltage range for the knock sensor?

 

[turbo2086]

What are your fuel trims like? I didnt have o2's at idle for a while either. I reset my ecu. I started getting o2 cycles at idle now. Also I replaced the mas since I have a 1g, those mas are so cheap. I did that a month ago, and everything seems to be reading fine on the logger.

 

[justin0469]

Ya I meant to post the fuel trims, they both show as 0% if it had to take away fuel it would read negative and more would be positive right?
Also, base timing is supposed to be 5* right? at idle mine bounces from 9*-12*

 

[BREW]

This may seem like a stupid question, but one that needs to be addressed none-the-less. Have you checked the front o2 sensor to make sure its not shot. From what you described it seems that its reading decent when there is a sufficient amount of exhaust flowing(ie. cruising), but when there is minimal exhaust flow(ie. idle), the sensor is not reading as well. I would pull the sensor first, if it looks white and chalky and hasn't been replaced in a while, that could be the culprit.

 

[justin0469]

I had not thought about the exhaust flow effecting the operation of the sensor but that does make sense. I will check it out