BreakYaNeckSS Posted February 17, 2008 Report Share Posted February 17, 2008 the truck is missfireing and throwing the codes listed below, i replaced the O2, it helped but didnt cure its also stalling out on me when i come to a stop. i have a brand new yellow top in there and theres plenty of juice. whats goin on here??? PO174 Fuel Trim Bank 2, System Fault PO300 Random/Multiple Cyl. Misfire Detected PO161 O2 Sensor Heater Circut Bank 2 Sensor 2 Malfunction (Replaced) Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted February 17, 2008 Report Share Posted February 17, 2008 Sounds like its time for a tune up.....plugs, wires, fuel filter, seafoam treatment......All the symptoms point to worn/fouled plugs or clogged/faulty injectors, or bad plug wires. According to AllData................... DTC P0174 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 and Closed Loop. During Open Loop, the PCM determines fuel delivery based on sensor signals without oxygen sensor input. During Closed Loop, the PCM adds oxygen sensor inputs and level of purge to calculate short and long term fuel trim adjustments. If the oxygen sensors indicate a lean condition, fuel trim values will be above 0 percent . If the oxygen sensors indicate a rich condition, fuel trim values will be below 0 percent . The values for the short term fuel trim change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term fuel trim makes course 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 engine load. If the PCM detects an excessively lean condition, DTC P0171 or P0174 sets. DTC DESCRIPTORS This diagnostic procedure supports the following DTCs: DTC P0171 Fuel Trim System Lean Bank 1 DTC P0174 Fuel Trim System Lean Bank 2 CONDITIONS FOR RUNNING THE DTC DTCs P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0101, P0102, P0103, P0106, P0107, P0108, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0151, P0152, P0153, P0154, P0155, P0157, P0158, P0160, P0161, P0200, P0300, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P0506, P0507, P1133, P1134, P1153, P1154, P2A01, P2A04 are not set. The Fuel Trim Learn parameter is enabled. The Loop Status parameter is closed. The engine coolant temperature (ECT) is between -40 to +139°C (-40 to +282°F) . The intake air temperature (IAT) is between -20 to +152°C (-4 to +304°F) . The manifold absolute pressure (MAP) is between 15-105 kPa (2.2-15.2 psi) . The vehicle speed is less than 132 km/h (82 mph) . The engine speed is between 400-6,500 RPM . The barometric pressure (BARO) is more than 74 kPa (10.7 psi) . The mass air flow (MAF) is between 1-250 g/s . The fuel level is more than 15 percent . This diagnostic runs continuously when the above conditions are met. CONDITIONS FOR SETTING THE DTC The long term fuel trim value is more than a calibrated value for approximately 3 minutes after the Conditions for Running the DTC have been met. ACTION TAKEN WHEN THE DTC SETS 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 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. The control module illuminates the malfunction indicator lamp (MIL) when one of the following occur: The control module detects the same fuel trim failure during 2 consecutive trips. The control module detects any fuel trim failure during any subsequent trip if the conditions at the time of failure meet the following criteria: The engine load is within 20 percent of the previous test that failed. The engine speed is within 375 RPM of the previous test that failed. The engine coolant temperature is in the same range of the previous test that failed. CONDITIONS FOR CLEARING THE MIL/DTC The control module turns OFF the malfunction indicator lamp (MIL) at the beginning of the fourth ignition cycle, 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 and related Freeze Frame data clears after 80 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 Excessive resistance in the fuel injector control and/or the ignition 1 voltage circuits may cause the following symptoms: A lean condition Misfire Rough idle. Refer to DTC P0200. See: P0200 The system may become lean if an injector is not suppling enough fuel. A lean condition could be present during high fuel demand. Review the Failure Records with a scan tool. If an intermittent condition is suspected, refer to Testing for Intermittent Conditions and Poor Connections. DTC P0300 SYSTEM DESCRIPTION The powertrain control module (PCM) uses information from the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor in order to determine when an engine misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the PCM is able to detect individual misfire events. A misfire rate that is high enough can cause the 3-way catalytic converter (TWC) to overheat under certain driving conditions. The malfunction indicator lamp (MIL) will flash ON and OFF when the conditions for TWC overheating are present. If the PCM detects a misfire rate sufficient to cause emission levels to exceed mandated standards, DTC P0300 will set. DTC DESCRIPTOR This diagnostic procedure supports the following DTC: DTC P0300 Engine Misfire Detected CONDITIONS FOR RUNNING THE DTC DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0125, P0128, P0220, P0315, P0335, P0336, P0341, P0342, P0343, P0502, P0503, P1114, P1115, P1120, P1258 are not set. The engine speed is between 450-5,000 RPM . The ignition voltage is between 10-18 volts . The engine coolant temperature (ECT) is between -7 and +130°C (+19 and +266°F) . The fuel level is more than 10 percent . The throttle angle is steady within 1 percent . The antilock brake system (ABS) and the traction control system (TCS) are not active. The transmission is not changing gears. The A/C clutch is not changing states. The PCM is not in fuel shut-off or decel fuel cut-off mode. The PCM is not receiving a rough road signal. DTC P0300 runs continuously once the above conditions are met. CONDITIONS FOR SETTING THE DTC The PCM is detecting a crankshaft rotation speed variation indicating a misfire sufficient to cause emission levels to exceed mandated standards. 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 Excessive vibration from sources other than the engine could cause DTC P0300 to set. The following are possible sources of vibration: Thickness variation of the brake rotors-Refer to Symptoms - Hydraulic Brakes in Hydraulic Brakes. See: Brakes and Traction Control\Hydraulic System\Testing and Inspection\Symptom Related Diagnostic Procedures\A Symptoms - Hydraulic Brakes The drive shaft not balanced-Refer to Vibration Analysis - Driveline in Vibration Diagnosis and Correction. See: Diagrams\Diagnostic Aids Worn or damaged accessory drive belt-Refer to Symptoms - Engine - 4.8L, 5.3L and 6.0L. See: Engine, Cooling and Exhaust\Engine\Testing and Inspection\Diagnosis By Symptom There may be more or less cylinders actually misfiring than indicated by the scan tool. Spray water on the secondary ignition components using a spray bottle. Look and listen for arcing or misfiring. If there are multiple misfires on only one bank, inspect the fuel injector and ignition coil, power and ground circuits for that bank. Quote Link to comment Share on other sites More sharing options...
BreakYaNeckSS Posted February 17, 2008 Author Report Share Posted February 17, 2008 well thats a mouth full, my wires and plugs are 3 months old so im guessing i can rule those out. the injectors is what i thought it was in the beginning, im running 42lbs and i was told i need the 60lbs so that could be my problem. i was told that the 60lbers need a different harness, does anyone know the story with that? Quote Link to comment Share on other sites More sharing options...
FireRescueSS Posted February 18, 2008 Report Share Posted February 18, 2008 Check injectors, fuel rail, and fuel lines. I've had several fuel related problems on my '04. Quote Link to comment Share on other sites More sharing options...
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