redemption

if my o2sensors are bad then will my idle be messed up ?
becuase ipuledcodes ande it sayed my o2 crapwas bad and that i was running lean

945LSTANG

well, then replace the sensors...

Pony 5.0

What codes did you pull?

redemption

its reading 41 and 91

69MustangCoupe393cid

id jsut replace the sensors replacing them will probably increase you gas mileage and give you back some lost power.

Joel5.0

If you have lean codes.....it doesn't necessarily mean the O2 sensors are bad, they might be reading correctly, and you may have a real lean condition, caused by something else in the system.....(exhaust leak, vacuum leak, low fuel pressure, bad injectors, disconnected HEGO ground wire, bad MAFor MAP/BP sensor.....as examples).......just a thought.

ALMOST STOCK

I got the same readings when I pulled the codes on my car, and I found out it was caused but a vacuum leak.

Follow what Joel5.0 suggested before you buy new o2 sensors.

redemption

well idid have bad o2 sensors just replaced them and made a hell of a diference but still moves up and down just a tiny tiny bit
that may be cuz my sister droped my maf sensor a while ago so im picking up a 75mm 19lb maf so hopeuflly it will run beter but i ono i checked for vacuume leaks didnt find any, is there a way i can check and adjust my fuel pressure its stock so i dont know

ALMOST STOCK

It wasonly asuggestion.

It's good to hear that you found your problem though.