2G Weird WB readings

[Tyler Davis]

Hello,

So I’ve been having something happen where when I first start up and drive everything seems normal, but as I keep driving maybe 10-15 mins go by and then the car progressively gets more and more lean until it is >18. I’ve changed out my front O2 sensor and have checked for boost/exhaust leaks and such and I’m kind of at a loss. The car doesn’t seem to drive or idle any different. I just feel like at >18 A/F I would notice something especially at idle. You think it’s just my wideband O2 going out or what?

Thanks

 

[Tyeler18]

Innovate gauge? Can you log front o2 voltages?

 

[Tyler Davis]

Innovate gauge? Can you log front o2 voltages?

It’s a non x-series AEM wideband and yeah I am at work rn but can get it later, I have link so I’ve been trying to look at stuff through it but I honestly don’t even know what it could be

 

[motomattx]

Exhaust leak the maybe opens up more as the system heats up? maybe a cracked manifold or a turbo housing thats cracked or leaking somewhere? those could cause that problem, which would explain why the engine dont exhibit any running issues.

 

[Tyler Davis]

ok here are 3 seperate logs on my drive tonight. I dont really know what im supposed to be looking for but the car almost drives like its rich but both o2s are reading lean as can be. ive messed with MAF settings to the point where even if i max it out it still goes full lean. I will check the manifolds and other hot parts to see if they may be cracked i didnt even think of that. thanks!