1G running extreamly lean

[DCGuerrette89]

ok so today at school i hooked my car to an exhuast gas annalizer because i thought my car was running rich turns out im running very lean. my hydro carbons were up to 3900 ppm and my co2 was at 0.8%. im thinking a bad O2 sensor. i checked my plugs and there not fouled and i ohm checked my plug wires and they were fine too.

and no MIL either

 

[92AWDHX40]

Ok how about mods to the car? How is it tuned if at all, is it stock?

 

[DCGuerrette89]

as far as i know its stok other than a few bolt ons
apex bov
magniflow muffler

everything else looks to be stock. i was gonna messure my cam lobes but didnt bother because the cam gears are stock and the ecm is stock as well altho the guy i got it from said it was chipped. but everything else he said was BS

i think it may have an egr blocking plate too i never checked

 

[greene3543]

You could pull the ecu to see if it's chipped, it doesn't take that long.

 

[DCGuerrette89]

well when i get out of school tomarrow im goin to pull out my cpu and see if its chiped or not. i also noticed thatone of the four prongs in the conector on the O2 sensor wire is broken. and could running 87 octain instead of 93 make a diffreance that drastic.