https://stream.echo6.co/videos/watch/5f45028e-3b69-4830-9de0-300775b0536a In this video I will show you how to use trouble codes, freeze frame data, short term and long term fuel trim data to determine the type of lean condition. Engine Performance Diagnostics chapters 4 and 5 Symptoms rough idle, higher than normal idle speed, lower than normal idle speed, run good under load, check engine light (P0171, P0174), Fix repair vacuum leak at the EGR tube, Tests shown how to use freeze frame data to determine type of lean condition, how to read and interpret fuel trim numbers (STFT and LTFT), how to locate a vacuum leak with a smoke machine, how to use idle speed and desired idle speed data parameters, Playlist (Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing https://www.youtube.com/playlist?list=PLD2809EEC7BAAF989, Related videos False mass airflow sensor/idle control system codes - vacuum leak - Pontiac https://youtu.be/1Ea0Sjx_ZXE, P0507 Idle Control System (RPM Too High) - vacuum leak - GM https://youtu.be/PKJnW08-Z8c, Understanding Short Term and Long Term Fuel Trim (an SD Premium video) https://youtu.be/oRX2V6_a3dc, Causes of lean condition trouble codes P0171, P0174 - GM 5 3L https://youtu.be/3RFTS22w6tM, Ford F-150 P0171 P0174 Trouble Codes - vacuum leak (water test) https://youtu.be/K-on2hbYUCc, For more on understanding and using fuel trim go to www.scannerdanner.com I know we have done this before, but seeing it again in a different situation is good re-enforcement of the topic. 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. Sun, 03 May 2026 09:49:15 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/5f45028e-3b69-4830-9de0-300775b0536a All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.