Ok so I'm having an issue with the car recently where it goes rich almost immediately after cruising at 80+mph on the highway. Once I go above that speed or basically above 4000rpm while cruising within a few seconds AFR's go rich, dropping abruptly from about 14.7 normally to high 12's low 13's?

If I let off and then get back on the throttle it will go back to normal but then AFR's drop again pretty quickly.

Also if I clutch in and blip the throttle and then just go back to cruising the AFR's go back to normal but after a short period go rich again.

Any opinions on what could be causing this?

 

Stock tune?

 

Yea Cobb Accessport but on a Stock Style tune right now.

 

Really? Hmm never noticed it before, maybe I'm just paying more attention to it now because I'm getting ready for the Turbo build. Just want to make sure I'm not having any issues before the install.

Edit: After looking at the AF Tables in Access Tuner for 5-6 Gear at higher Calc Loads the AFR does start to drop off, guess I'll look at that on my next drive just to make sure it's normal.

Thanks

 

Thanks Ray, That's good to know.

 

if there was an issue that caused it to go rich you'd get a cel.