throwing a p0174 code system too lean on bank 2? now this is what i have installed on the truck. 97 f150 4x4 . cai, headers, 2 1/4 in exhaust , x pipe, magnaflow high flow cats, borla mufflers with turn downs.

any ideas? need bigger fuel injectors to compensate for the higher air flow? do i need to go full pipe after the mufflers instead of turn downs? feels like the truck stumbles like its losing power then picks up then loses it again? is it sucking my fuel rail dry? fuel pump? the fuel filter was just changed. just changed the plugs last spring. just put 4 new o2 sensors in it when i did the exhaust last weekend.

any help would be great!

 

Sounds like a COP issue. I installed an new set today. Truck through a 0174 and would stumble under acceleration. I had to go through each one individually until I found that one was bad.

Also, from what I understand, the Edge is for stock trucks. With the CAI, I would think you would need a custom tune.

 

Check for vacuum leaks.

 

Yes, check the PCV rubber elbow at the back of the intake. These are known to get burnt, brittle, and leak.

 

are those on the back of the elbow where the throttle boddy attaches? i heard it was lower intake more towards the back but i never seen it.

 

It's just under the TB.

 

"A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.
A P0174 lean code for bank 2 is the cylinder bank on the LEFT (driver) side of the engine on Ford vehicles with a transverse-mounted V6 engine
and front-wheel drive. This code is not set on four cylinder engines (no bank 2).
WHAT A LEAN CODE MEANS
A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.
DIRTY MAF SENSOR
One of the most common causes of Ford P0171 and P0174 lean codes is a dirty mass airflow (MAF) sensor. The MAF sensor is located in the air inlet tube
just ahead of the throttle body. The MAF sensor should be protected from outside dust and debris by the air filter, but sometimes the air filter doesn't fit real tight inside the housing and allows unfiltered air into the engine. Dirt can stick to the MAF sensor wire and form a coating that slows the response of the sensor to changes in airflow. The MAF sensor can also be contaminated by fuel vapors that back up through the intake manifold and throttle body when the engine is shut off."