ryansm1

iTrader: (8)

The SES light came on the other night while driving; I got it pulled today and these are the codes I received (P0172 and P0175).

I did a search here and the only thing I found were problems people were having after installing larger injectors, tuning problems, or a backwards MAF . My car only has a cutout, so I don't think it is the first two and the MAF is not backwards.

What should I look for first, possibly the O2 sensors?

sunsetorangessls1

this might be of some help
http://www.bowlingss.com/Mods/Engine%20Codes.pdf
says bank1 is rich and bank 2 is also running rich.
how many miles are on car?

ryansm1

iTrader: (8)

Thanks; I looked up the codes (and could tell it's running rich, you can smell the excess gas being burnt), but the light went away when I drove it tonight. It was on when I went to work, but off when I came home.

Any ideas as to what causes this? ~102k miles on the car.

YoMommasTA

iTrader: (1)

stuck or sticking injectors can cause it.the fuel rails rust on these cars and can cause the injectors to become disfunctional.

sunsetorangessls1

ever changed 02 sensors? If not might wanna look into those also
J

2K2WS6TA

iTrader: (2)

You might have a piece of trash stuck in one (or more) of your injectors, causing the injector(s) to stay open and dump fuel into the cylinder(s)

volumebikertom

I you have access to a tech 2, or just go to a gm dealer, they can do a injector power balance test, to see if any are sticking open. I have the same thing wrong with my car, but still I haven't found the answer. Also if you have an aftermarket air filter, and you just cleaned it, the oil from it can dirty the mass air flow sensor, so check that really good. I see that you got both codes for bank 1 sensor one running rich, and bank 2 sensor one running rich, this is the same as mine. I'm thinking it might be aftermarket o2's on mine, do you have aftermarket ones?