2003 Silverado 1500 getting p0172 and p0175 rich codes

[Chevyguy11]

I have a 2003 Silverado 1500 with the 5.3 in it. For the past couple months the trucks been getting the p0172 and p0175 bank 1 and 2 running rich. I have clean the maf sensor and put a new air filter and spark plugs in and cleaned the pcv valve, throttlebody and map sensor too checked for leaks around the intake manifold and around the throttle body and found no leaks also put in new o2 sensors and the codes still come back up every time. Wondering if anyone else has had this problem or know what could be causing the codes? I’ll post a picture of the freeze frame data from the codes too.

[CamGTP]

Can you check fuel pressure?

 

I'd want to make sure that is in spec and that the regulator isn't leaking in extra fuel because of a failing diaphragm.

 

If possible it would be nice to see if a different MAF sensor could be swapped in for testing. If you knew another person with a GM truck from the same era you could swap the sensor, clear the code and go for a drive to see if it stops throwing the code.

[Chevyguy11]

28 minutes ago, CamGTP said:

Can you check fuel pressure?

 

I'd want to make sure that is in spec and that the regulator isn't leaking in extra fuel because of a failing diaphragm.

 

If possible it would be nice to see if a different MAF sensor could be swapped in for testing. If you knew another person with a GM truck from the same era you could swap the sensor, clear the code and go for a drive to see if it stops throwing the code.

I did pull the vacuum line off the top of the fuel pressure regulator and it did not have any fuel coming out of it. I think I’ll try to use your idea of swapping mass airflow sensors with one of my friends with the generation pickup and see if that works. Thanks for your help!