Fuel trims problem

[cevic]

I was monitoring the fuel trims today and noticed the Low trims will drop to as low as 85.5% at local, which sound to me like running a bit rich. But on the other hand, the high trim would go up to 111% on highway and that told me it was runnning a bit lean. Any suggestion on how to get all three trims close to 100%? Everything in the car is stock except for the turbo which is from a automatic version (13g). My vacuum gauge shows 18inHg at idle.

 

[jepherz]

Vacuum readout really isn't anything to compare unless its WAY off. Did you check your o2 sensor readings to see if they make sense?

 

[cevic]

All I know is that the O2 sensor is working because the value on the logger is cycling. But how do I determine the value does make sense or not?