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Originally Posted by mab6680
i had this problem about a week ago posted on this site same codes po171 -po174 banks 1 and 2 running lean my post should be a couple of lines down (check engine light) i have check all the same things you have they also said to clean the maf sensor i dont know if it worked or not i had to disconnect the battery for other reasons so the computer reset it self but i will let you know if it work you should clean it any way my mpg did go up so what could it hurt
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Some weird things that might leak:
Brake power booster diaphragm ( they can be intermittent leaks)
Hose from power brake booster to manifold
Oil dipstick tube seal is shot, or not in tight
Oil filler cap loose / leaking
Evap vent solenoid hose to manifold cracked, bad
Vacuum lines for heater controls leaking - manifold to under dash
Leak at heater control valve
EGR vacuum supply line leaking
EGR tube from exhaust manifold to EGR valve leaking
EGR valve loose/leaking
Leak in exhaust system before O2 sensors
Cracked air intake tube from air filter to throttle body
Loose clamp on air intake tube
Leak around maf sensor itself
Any hose elbow on a vacuum line cracked
Valve cover loose
IAC valve loose or leaking
Throttle body gasket leaking
Leak at fuel injector O ring in manifold
Upper intake manifold to lower intake manifold gasket leaking
I am sure I forgot something. Some of that stuff is admittedly pretty unlikely. But a lot of it can be checked easily.