To Lean 1 & 2

[Lewis Wetherall]

I need help,      P0171 System Too Lean Bank 1,        P0174 System Too Lean Bank 2 ,   Anybody know how to correct or the symptoms.

[Lewis Wetherall]

I recently switched out coils and plugs on all 6 cylinders.

[Lewis Wetherall]

3.0 L  Ford

[Lewis Wetherall]

21 hours ago, Lewis Wetherall said:

I need help,      P0171 System Too Lean Bank 1,        P0174 System Too Lean Bank 2 ,   Anybody know how to correct or the symptoms.

3.0 L  Ford

[JOE-DOT-COM]

HI

If you have banks 1 and 2, then its common to both

somewhere between maf and inlet manifold, a air leak, because its unmetered the engine can't compensate for it

Check the flexi pipe after the maf and any other pipe attached to the inlet manifold, like cam cover breathers

cheers

Joe

[piria33]

If there are no air leaks (smoke test?) then it could be the maf. Try cleaning it.

I've had super lean conditions before on a different car. new maf sorted that out once air leaks had been ruled out.