tahoe po171

[DBoy]

Hi everyone I got a 99 tahoe with a po171 lean. I checked for leaks in the lines and changed o2 sensors. Do u think it can be injectors since it on one side and not both....

 

[lesterl]

System too lean bank1, so check the drivers side over real good, is the exhasut manifold busted? How do the plugs look? How does it run? What is the fuel pressure?

 

[DBoy]

I just did fuel pump,plugs,wires,cap and rotor all delco parts 3 months ago..now I'm getting the 171 and the po174 code just changed the maf will see if code comes back ill let ya no..:flame:

 

[lesterl]

Yeah, test the fuel pressure agian, especially if you used a non OEM pump (AC DELCO/ DELPHI).

Otherwise you have a Vac Leak somewhere, start spraying around with some carb cleaner at some of the lines, especially the hard plastic ones with it idling, check for RPM surges.

Good luck.