P0171 Lean Condition w/ Troubleshooting Steps Taken/Data Logs
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P0171 Lean Condition w/ Troubleshooting Steps Taken/Data Logs
2016 Chevy Silverado 5.3L V8, 76.5k miles
P0171
Symptoms: Truck runs fine mostly but has about a 10% reduction in fuel economy. After running for a while and idling, randomly, the truck will experience a rough idle during which short term fuel trims will spike. The truck starts fine and from what I can tell, has no loss of power while running. Given that rough idle/code takes some time to occur and can often be "reset" by clearing codes, it makes me believe I have a valve or something mechanical that is malfunctioning to create a lean condition.
In the last 2k miles, I have replaced:
Any ideas? Thank you.
P0171
Symptoms: Truck runs fine mostly but has about a 10% reduction in fuel economy. After running for a while and idling, randomly, the truck will experience a rough idle during which short term fuel trims will spike. The truck starts fine and from what I can tell, has no loss of power while running. Given that rough idle/code takes some time to occur and can often be "reset" by clearing codes, it makes me believe I have a valve or something mechanical that is malfunctioning to create a lean condition.
In the last 2k miles, I have replaced:
- Spark plugs and coil packs
- Oil and filter change
- Air filter check (clean)
- Mass airflow sensor
- Mass Air Pressure sensor
- Ambient air temp sensor
- EVAP purge solenoid
- PCV Valve
- Transmission replaced (stock failed)
- At this time, I also had rear diff and transfer case fluid changed
Any ideas? Thank you.
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