I keep getting codes P0131 and P0171...After cleaning the AEM dryflow, installed a new MAF sensor the RIGHT way, checked for intake tube leaks. Replaced the fuel filter. Checked all the evap hoses/canister for leaks, and tested the vent solonoid. Replaced the gas cap. Checked and replaced vacuum lines under the hood. Sprayed carb cleaner around the injectors, intake minifold and blower while running. Cleaned the throttle body. Checked for exhaust leaks. Then erase the codes, and they keep coming back on again. Im thinking it may be a bad oxygen sensor?

BTW '06 SS/SC GM Stage 2, airbox mod with AEM dryflow, Both mods were done over 2 years ago.

 

I say try a different filter first on the cai ,see if a buddy will lend you one for a hour and reset the codes and drive the car.if that doesnt work then invest in a O2 sensor.

 

Tried that too, no luck. It must be the O2 sensor then. Thanks

 

Nope, its your evap canister stuck open.

 

Well, I replaced the O2 sensor, cause the wires were cut open at the end. I cleaned the 2 month old plugs too, cause they were absolutly black. But the P0171 still came back. The valve on the evap canister is working fine, I even tried a new one, with now luck. Maybe I have a leak in the canister itself? Im gonna hafta check the evap hose that runs the length of the car again too.

 

I read some where that a bad oring on the dipstick can cause it to.
Sound funny but Im not kidding ,will see if I can dig it up.

Visually and physically inspect the following items:
• The vacuum hoses for splits, kinks, and proper connections--Refer to Emission Hose Routing Diagram .

• Properly functioning fuel injectors--Refer to Fuel Injector Diagnosis .

• If fuel pressure is too low, this DTC may set. Refer to Fuel System Diagnosis .

• Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis .


Inspect for the following conditions:
• The HO2S for proper installation

• Ensure that the electrical connectors and wires are secured and not contacting the exhaust system.

• The HO2S signal circuit for an open or a short to ground


Inspect for the following conditions:
• Missing, loose, or leaking exhaust components

• Vacuum leaks at the intake manifold, throttle body, and injector O-rings

• The air induction system and air intake ducts for leaks

• The crankcase ventilation system for leaks (Bad Oring will cause this situation)

• The evaporative canister purge pipes for obstructions or plugging

 

What about holes in the exhaust system? I am throwing this CEL also

 

P0171 is running lean.
Check for an intake leak between your mass airflow sensor, and your supercharger.
This is where excess air that is not accounted for can enter the system to throw off your A/F mixture.

My K&N rubs on my PCM so thats an area you gota watch for if you have the LSJ.


Yes, I could see an exhaust system leak causeing this.
Fresh Air gets drawn into the exhaust line via the venturi principal
giving more Oxygen to the O2 Sensor. Check between the Exhaust Manifold gasket and the O2 Sensors.

Also i reccoment checking your fuel pressure/fuel filter/pump. Low fuel pressure, will cause the fuel to not flow as fast so volume of fuel flow would be down.

 

Well I guess its my fault for not replacing the exhaust mani gasket while repplacing the mani.... Now I have to do the job one more time...

 

so what was the issue?!
i am having the same problems and have tried a lot of the same things