2006 Cadillac Escalade P0171 and P0174 codes.

Question

I pulled these codes a few days ago when my MIL came on. The vehicle is now hard to start and stumbles when first idling. It will crank over and over and not start, then I can turn the key off and try starting again and it starts. It also seems to have less power at higher rpm than it did before. Since this happened I have:

Checked for vacuum leaks - none.
Cleaned MAF sensor twice
Had fuel injectors cleaned (through vacuum line,  not fuel rail)
New air filter

Nothing has helped. I am out of ideas, unless it is the fuel pump. Any help would be greatly appreciated.

Answer 1

HI there,

The next step here has to be checking the fuel pressure. If the fuel pressure is good, it's been my experience that cleaning the maf generally doesn't help and it needs to be replaced.