so for those of u who post on camaroz28 forums u might already know of my problem, i have a 95 camaro 6 speed with le1 cam, le2 heads, ported intake, shorty headers bbk, 30lb accel injectors, srp -16cc srp pistons, my compression is at 10.3:1 calculated by my engine builder. Im running eagle h beam forged, with a cast crank. 383, mad z28 tune, cai, 58mm tb. Im running 3000 hydrocarbons at 15mph and 2500 at idle, my co were at 3.1% at idle and 5.0% at 15 mph.

My friend and i took the afr tonight from the DRIVER SIDE only.
Afr rpm
16.7:1 850 idle cold
12.9:1 850 idle warm
10.6:1 4500 mid rpm
12.5:1 wot

while driving from 1000 rpm-2500rpm i experinced a fluctuation of 12.8:1-14.7:1
this all seems normal to us, if it isnt please tell me.
tommorrow i plan on adding an o2 opening on the passenger side in order to get a reading. So from all this i think ive narrowed it down to a cat or something on the passenger side bank. Anyother ideas is greatly appreciated.

 

Well, the a/f cold at idle shouldn't be that lean. It should be rich. Also, are you still running a closed loop tune? The 4500 rpm spot is rich and WOT looks good. In closed loop, the car should be somewhere near 14.7:1, until closed loop (PE mode) is entered.

 

up for u