help fix PO171 and PO174 codes please

[paladin130]

i installed a blackwing air filter, a granatelli mafs, a smooth bellows and a corsa exhaust three months ago. it runs fine but i got these codes yesterday. dealer says put stock parts back on, granatelli says clean mafs with non-chlorinated brake cleaner, suspects oil from aftermarket air cleaner got mafs wires dirty, any suggestions, ideas? thanks rick

 

[vette747]

That could be an air leak. Additional air comes to the system making the PCM believe it is too lean. Check clamps and connection.

 

[Mr. Lucky]

it runs fine but i got these codes yesterday. dealer says put stock parts back on, granatelli says clean mafs with non-chlorinated brake cleaner, suspects oil from aftermarket air cleaner got mafs wires dirty

Well... since it (apparently) ran fine for 3 months, I think Granatelli may be onto something there. However, I think a safer and easier cleaner would be to substitute contact cleaner (the kind in a spray can with an extension nozzle), available from Radio Shack or any electronics supply house. FWIW, here is the official t/s procedure for those codes on an '04.

GL!

 

[Patrick]

Vette747 is correct about the air leak. I've had two occasions where I start getting those codes (and a check engine light, too), and on both occasions, it was my Mass Air Flow sensor. It had come loose. I simply slipped it back in place, cleared the codes, and the problem was solved.


-Patrick

 

[paladin130]

thanks for the info, rick