AFR's go off the chart lean when I lift...

[fstlane88]

I'm using a PLX M-300 wideband and have been noticing lately that when I lift, unless I slowly lift off the gas, like anything quick, especially after I've been in boost, usually only 5-6lbs, it just reads LEAN. It will then comes down back to where it normally is, which is rich b/c the car is untuned. Note this happens in the time span of about a second. As I go into boost it will start to read richer until it's off the charts rich, but I would expect it to read rich when I lift, or am I missing something?

~Bryan

 

[IJ.]

Decell cut it's normal.....

 

[Tim]

Yah man, my car does the same thing. I am using Zeitronix, and I was tripping out when I noticed my car did that the first time. My AFR's went very lean when I lifted!

 

[fstlane88]

Ok cool, just wanted to make sure it's was normal. Was worried it had something to do with the tune, or lack there of.

 

[Supracentral]

If it didn't do that it would never pass emissions.