94firebird

this all started back in sept and i just got the car out of the shop today. this code will not go away they told me to change the gasoline i use. is there a smarter way to stop this code from showing up. my CEL came back on and got the car out of the shop about 30min ago. this is really strating to **** me off that it wont go away and the idiots dont know how to fix it. i mean come on its their job and they cant even do it. (im not knockn you guys who work at the service dept btw) i jst need the light off nad problem fixed.

Any of you guys that faced this problem and are done with it please tel me what you did.
FYI the stage 2 is installed

Maxim_X

Vac leak or intake leak? DO you have an aftermarket intake?

WhiteFiver

its ur intake. plain an simple...move it around, and make sure that u have the maf in there properly.

94firebird

i have the stock intake. they replaced the MAF in sept. think they put it in wrong or something?

Rodimus_Prime

iTrader: (3)

change the gas? god how do these people get jobs no wonder gm is going out of business they are surrounded by ********

check the entire system is screwed in and all connections tight verify the maf is correctly connected, if all that checks out ultimately what you need is a MAF calibration which can be done with hp tuners, the reason the code is coming up is because its more than 20% wrong

flash13brandon

Check your injector o-rings for leaks

94firebird

Ok so fri im guna work on the car see if i can do what these guys havent been able to to for 6mnths now. so what will i need to do to take out my intake and MAF? does anyone no of a how-to link for this? or am i goin about this wrong and should try something else?

flash13brandon

To take out MAF: I find it easy to just take out the headlight. Then you can un screw the MAF. Clean it and put it back in.

94firebird

FAIL!!!!!!!!!!!!!!! took out the MAF cleaned it disconnected battery to reset computer and notin changed..... just got back from the dealer ship told them guess now i gota do the research for whats wrong and bring it to them so they have a heads up on what to do.

Red07Coupe

God old AlldataDIY!!!





DTC P0171

Circuit Description

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 Loop and Closed Loop. During Open Loop, the PCM determines fuel delivery based on sensor signals, without heated oxygen sensor (HO2S) input. During Closed Loop, the PCM adds HO2S inputs and level of purge to calculate the short and long term fuel trim adjustments. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent . If the HO2S indicates a rich condition, the fuel trim values will be below 0 percent . The short term fuel trim values change rapidly in response to the HO2S voltage signals. The long term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. A block of cells contain information arranged in combinations of engine RPM and engine load for a full range of vehicle operating conditions. The long term fuel trim diagnostic is based on an average of cells currently being used. The PCM selects the cells based on the engine speed and load. If the PCM detects an excessively lean condition, DTC P0171 sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0171 Fuel Trim System Lean

Conditions for Running the DTC



DTCs P0030, P0036, P0068, P0069, P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0130, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0201-P0204, P0220, P0222, P0223, P0300, P0301-P0304, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P0506, P0507, P1133, P1134, P1516, P1680, P1681, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176 are not set.
The engine is in Closed Loop status.
The engine coolant temperature (ECT) is between -7 and +120°C (+19.4 and +248°F) .
The intake air temperature (IAT) is between -7 and +145°C (+19.4 and +293°F) .
The manifold absolute pressure (MAP) is between 15-100 kPa (2.2-14.5 psi) .
The vehicle speed is less than 132 km/h (82 mph) .
The engine speed is between 400 and 6,100 RPM .
The mass air flow (MAF) is between 1-512 g/s .
The barometric pressure (BARO) is greater than 72 kPa (10.4 psi) .
The fuel level is greater than 10 percent .
DTC P0171 runs continuously once the above conditions have been met.
Conditions for Setting the DTC



The long term FT weighted average value is more than a calibrated value.
The above condition is present for more than 2 minutes .
Action Taken When the DTC Sets



The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC



The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
Diagnostic Aids



Test for fuel contamination. Small amounts of water can be delivered to the fuel injectors and cause a lean exhaust indication. A lean exhaust indication can also be caused by too much alcohol in the fuel.
The system will go lean if an injector is not supplying enough fuel.
A lean condition could be present during high fuel demand due to a fuel pump that does not pump enough fuel, a plugged fuel filter, or a restricted fuel pipe.
Review the Failure Records with a scan tool. If an intermittent condition is suspected, refer to Intermittent Conditions. See: Initial Inspection and Diagnostic Overview\Intermittent Conditions

07touringcoupe

iTrader: (1)

I'm throwing a lean code also after the install of the stg2 kit. I have intake and stg2 gutted cat. And before the stg2 no codes but after the install I got lean. Do I need a tune?