2011 Chevy Aveo with a P0171 caused by a cracked air intake tube

There are a lot of causes for a P0171 Fuel Trim System Lean fault code. A cracked air intake tube is one that is often overlooked. Video breakdown: Video Breakdown: - 1:15 trouble code P0171 Fuel Trim System Lean (Symptom 00) - 1:40 analysis of freeze frame data - 2:53 live fuel trim data readings - 3:26 how to determine if you are in open or closed loop based on STFT data - 4:56 MAF or fuel pressure problem identified - 5:10 visual inspection of the air intake hose - 6:25 fuel trim data explained (why the condition was not immediately present) - 7:00 brake torque in drive - 7:23 visual of the air intake tube during a brake torque in drive and reverse - 9:30 Chapters 1, 4 and 5 playlist links Chapter 1 Universal Testing Methods playlist YouTube https://www.youtube.com/playlist?list=PL5E3AEC36DB838BB1 ScannerDanner Premium https://www.scannerdanner.com/scannerdanner-premium-chapters/chapter-1-universal-testing-methods.html Chapter 4 Oxygen Sensors and Fuel Trim playlists YouTube https://www.youtube.com/playlist?list=PLD2809EEC7BAAF989 ScannerDanner Premium https://www.scannerdanner.com/scannerdanner-premium-chapters/chapter-4-oxygen-sensors-and-fuel-trim.html Chapter 5 Oxygen Sensor Testing playlist YouTube https://www.youtube.com/playlist?list=PLD2809EEC7BAAF989 ScannerDanner Premium https://www.scannerdanner.com/scannerdanner-premium-chapters/chapter-5-oxygen-sensor-testing.html - 9:46 Understanding ST and LT Fuel Trim https://www.youtube.com/watch?v=oRX2V6_a3dc - 10:38 some final tips/review about how to identify a cracked air intake tube without opening the hood - 12:31 Like and follow ScannerDanner on FaceBook https://www.facebook.com/ScannerDanner/ For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere! Disclaimer: Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.