My car when driving at about 10-30% accel is jumping between 17.8-16.5..Is this ok? Now when at 80-100% accel it gets mad rich....

 

Are you sure this isn't a reading when you let off the throttle? What is your AFR at cruise?

Post your logs.

 

yup at 17.5-16.5 when 10-30% throtle and when i let off it goes blank..

 

Where is you a/f reading coming from? The Tuna? An AFR gauge?

Hint: The more details you provide the more people will offer up help. The more vague you are the less likely folks are to chime in, because they won't know how.

 

Sorry ... my aem. afr gauge.

 

Perhaps you do not have the Tuner configured properly for the AEM gauge? Does the AFR Display on the Tuner say something different than what your AEM gauge reads?

 

What all is done to the car? How does it drive?

I ask because I have a buddy that has a Greddy TT and he was having the same issues, but the car ran halfway decent. We switched the AEM wideband sensor to his passenger side stock O2 sensor bung and the sensor reads fine. This makes us believe he has a leak in his piping, but he hasn't been able to work on it yet.

But, it would idle and drive really lean, until he stepped on it, then it would go pig rich.

 

The motor is built and the wideband is in the passenger side of the car. And yes the car goes rich when i step on it. 10.2 and b-low

 

Try moving the sensor to the drivers side.

If you have an air leak in the piping it will draw fresh air in at idle, but still force rich fumes past under load.

You may also try a new sensor.