F.G.

ok so i was driving my car and gave it a bit of throttle then backed off(didnt go WOT) as soon as i did that, i got an ses light. I took the car home and it felt like it was misfiring. I used the scanner and the codes said banks 1 and 2 were too lean, and it also threw a code for the front o2 sensors. My question is, can the o2 sensors cause my car to run lean? and when a car runs lean does it feel like a misfire? thanks for the help.

F.G.

bump...

F.G.

anyone ever had this problem?

SSpdDmon

iTrader: (10)

It could be a bunch of things. It could be an intake/exhaust leak, it could be a MAF problem, it could be O2 sensors...

massconfusion

iTrader: (18)

bad o2 sensors can cause that but have you recently done any mods

2001NBMZ28

Yeah, could be a lot of things. If 171 and 174 are set at the same time could be a fuel issue, vacuum or PCV leak.....

www.gearchatter.com/viewtopic8737.php

98pontiac

Bad 02 sensors will not cause misfiring... most likely it is NOT the 02s... expecially if you have a lean code, the sensors are just related because they are reading lean as well. try cleaning your maf with "MAF cleaner" only, dont use brake clean or anything else. then clear the codes... that should take care of it, otherwise a fuel issue... OR find a shop who does free estimates... I know youd be wasting there time, but hell, if its free..... I do it all day long for people...

F.G.

thanks guys. I haven't done any mods to it. I changed the o2 sensors and it started running better, but once I got to WOT the ses came back on, and sure enough, it was running bad again. the code it threw now is po174 and the o2 sensors as well. I just bought some MAF cleaner. I hope it works.

F.G.

Well...I cleaned the MAF and it didnt solve the problem, its still running just as bad as before, except now the only codes it throws are for the o2 sensors I'm getting fed up with this car, I cant even enjoy it.

2000NHRAFormula

dont get too fed up with it just yet....wait till you start to do mods and then things are not right haha thats when you get fed up with them!! Are there any other codes esides just the 02 codes?? and did you replace the 02s with a gm relpacement or a cheap one??

moehorsepower

iTrader: (3)

check your plugs, If its truly a lean condition then the PCM will try to dump fuel to correct possibly causing fouling plugs...

blackpontiacs

i also randomly get the p0171 and p0174 lean codes. but the car still runs fine even when the light is on. usually i drive a few miles and it goes off on its own. i have cleaned the maf and that didn't work for me. i think i'm just gonna have to find a shop that knows what they're doing and see if i've got a vacuum leak somewhere.

F.G.

now its just throwing the o2 codes, and i used the bosch o2's. this morning i turned the car on and it was still shaking and all that, but then the idle got really low and wanted to die(i gave it throttle and kept it from dying) later on i turned it on again, and the idle wouldn't go as low, however when i would give it gas, it would sputter and as i would let go of the throttle I could hear small explosions, detonation maybe, backfire? I'm gonna check the spark plugs even though they a long with the wires are new, but I will probably end up taking it to a shop.

69LT1Bird

iTrader: (1)

Did you even go read the procedure for the codes?
Did it start after a fuel fill up?
How old is the fuel filter?
Did you check to see if perhaps a vacuum line came off near the TB?

Some very basic items. They make diagnostic tables for a reason. Guessing and tossing parts at it just helps out the economy and won't fix your car.