aright i have a 92 civic cx hatch with a 93 d16z6 aem cold air port and polished exhaust no cat 2 1/4 piping. and for fuel i have a b16 del sol fpr and a b16 del sol fuel pump

my question is... during the day my car runs stoich at partial throttle and when its full thorttle its rich wich is normal right?

well when its night time and cooler it runs lean as **** when its partial throttle and when its full throttle it barely runs stoich

if anyone knows what the problem could be let me know.

 

i'm assuming your looking at a narrowband A/F gauge? If you are, it won't tell you anything usefull. best way to check if your not in a position to buy a wideband is check the plugs.

 

Ok back to tech..lol

Your stock Narrowband o2 isnt gonna tell you ****. its gonna give you a nice lil light show.

In order to get a accurate A/F ratio reading you need to get a Wideband o2 sensor. i would really recomend the PLX M300 wideband. it has outputs that can go to ur ECU if you are datalogging, and has a wire that can go to your A/F ratio gauge. but it comes with a digital display so the gauge isnt really needed