So, I'm having an issue. Yesterday my serpentine belt ripped off and car **** off.. now my car is running on aem ems
Now after repair when I stern spoiling my wideband drops to 10.0...aka super rich Lol and builds almost no boost.
Any reason why it would do that ?
I'm probably just going to recalibrate the tune and see if that helps, but I thought even when battery was unplugged still shouldn't affect the tune?

 

fix it the belt/battery et and try again. sounds like spark is weak hence "running rich"?