Hello,
I am stumped and frustrated. My vehicle has both codes (P0171 and P0174) and it runs rough cold and smooth out a bit warm. I have changed the mass air flow sensor, plugs wires air filter. I cannot find a vacuum leak at this point, I had a shop try to correct problem they did a smoke test and found a couple vacuum lines to replace.
I am stumped and frustrated. My vehicle has both codes (P0171 and P0174) and it runs rough cold and smooth out a bit warm. I have changed the mass air flow sensor, plugs wires air filter. I cannot find a vacuum leak at this point, I had a shop try to correct problem they did a smoke test and found a couple vacuum lines to replace.
Sep 26, 2016 at 2:30 PM
