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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
• (Chapters 4 and 5) Fue...
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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 www.scannerdan... 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.