foru2nv4

They the codes means running lean on bank 1 and bank 2. Why? Car was running fine till I changed the 4 brakes and rotors on car. After that I am gettin a check engine light with those codes. I have supercharged the car put smaller pulley on the car and put injectors in the car of 30LBS. but if its runnin lean it means car not gettin enuff fuel. (Am I right or wrong?). What does that mean? Do I Need bigger injectors? Bigger fuel pump? Dirty or clog fuel filter? Is there summin wrong with fuel pressure regulator? I don't know need ur alls help.

1998Slow 'Stang

I could only assume you had it dyno tuned after you put on the s/c

foru2nv4

Yes the PCM was sent off to have it programmed at the saleen facility specific to the series IV supercharger. Whats stupid is that I did a complete brake job new pads and rotors and the car was running fine before the brake job. I don't know maybe just a coincidence but the car was jack up on a jack for several days from front to back one wheel at a time maybe with gas leaning to one side fuel pump got stupid and dried up LOL.... I don't know this car is pissing me off one thing after another.

sonicx

Both codes P0171 & P0174 (sorta go hand & hand together)

The MAF (Mass Air Flow) Sensor is dirty (have you checked this yet)?
OR
There could be a vacuum leak downstream of the MAF sensor (have you checked thus yet)?

I'd first simply clean the MAF sensor with MAF cleaner.... see if that does the trick.

foru2nv4

Thanks everyone I am pretty sure I fixed the problem cause ran the car for well over an hour today no CEL. I pulled the MAF off look down into it from the top and side and I had a missing wire inside the connects between the poles. So I hope this was the problem.

sonicx

Yes, i am almost certain it was. Although it never hurts to clean the MAF around the same time as your Air Filter.

foru2nv4

Well have put 200 miles on the car and probably 30 starts no check engine light anymore so the MAF was broken and causes those codes.

1998Slow 'Stang

Glad you got it fixed man. Have fun with that S/C