Engine codes?? MAF sensor???

[Sublime69]

My check engine light came on and i got it scanned and here is the codes p0171 and p0174 (left and right fuel bank lean) Could this be a bad MAF sensor?? also i dont know if this could be the MAF also but when i start the truck in the morning and the first time i hit the gas, it wants to die, but then its fine. and when its idoling it feels like its missing but then seems to smooth out after its fully warmed up.


Thanks

BTW its a 99 z71 5.3

[GMMerlin]

Originally Posted by Sublime69

My check engine light came on and i got it scanned and here is the codes p0171 and p0174 (left and right fuel bank lean) Could this be a bad MAF sensor?? also i dont know if this could be the MAF also but when i start the truck in the morning and the first time i hit the gas, it wants to die, but then its fine. and when its idoling it feels like its missing but then seems to smooth out after its fully warmed up.


Thanks

BTW its a 99 z71 5.3

The powertrain control module (PCM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During Open Loop, the PCM determines fuel delivery based on sensor signals without oxygen sensor (O2S) input. During Closed Loop, the O2S inputs are added and used by the PCM to calculate short and long term fuel trim fuel delivery adjustments. If the O2S indicate a lean condition, fuel trim values will be above 0 percent. If the O2S indicate a rich condition, fuel trim values will be below 0 percent. Short term fuel trim values change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. If the PCM detects an excessively lean condition, DTC P0171 or P0174 sets.

Visually and physically inspect the following items:
- The vacuum hoses for splits, kinks, and proper connections.
- Ensure that the vehicle has sufficient fuel in tank. If fuel pressure is too low this DTC may set.
- Fuel contamination
Inspect for any missing, loose, or leaking exhaust components forward of the HO2S.
Inspect for vacuum leaks at the intake manifold, throttle body, and injector O-rings.
Inspect the air induction system and the air intake ducts for leaks.
Inspect the secondary air injection (AIR) system for leaks, improper air delivery, and for the shut-off valves not closing.
Inspect the crankcase ventilation system for leaks.

To answer your question..probally not

[Sublime69]

Originally Posted by GMMerlin

The powertrain control module (PCM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During Open Loop, the PCM determines fuel delivery based on sensor signals without oxygen sensor (O2S) input. During Closed Loop, the O2S inputs are added and used by the PCM to calculate short and long term fuel trim fuel delivery adjustments. If the O2S indicate a lean condition, fuel trim values will be above 0 percent. If the O2S indicate a rich condition, fuel trim values will be below 0 percent. Short term fuel trim values change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. If the PCM detects an excessively lean condition, DTC P0171 or P0174 sets.

Visually and physically inspect the following items:
- The vacuum hoses for splits, kinks, and proper connections.
- Ensure that the vehicle has sufficient fuel in tank. If fuel pressure is too low this DTC may set.
- Fuel contamination
Inspect for any missing, loose, or leaking exhaust components forward of the HO2S.
Inspect for vacuum leaks at the intake manifold, throttle body, and injector O-rings.
Inspect the air induction system and the air intake ducts for leaks.
Inspect the secondary air injection (AIR) system for leaks, improper air delivery, and for the shut-off valves not closing.
Inspect the crankcase ventilation system for leaks.

To answer your question..probally not

Another guy on here said he had the same proble amd it was a bad intake gasket.. i guess ill have to check it out.