In this video I’ll show how to perform an oxygen sensor response test, and how to inspect for a leaking fuel pressure regulator. The oxygen sensor response test demonstrated can be successfully applied to any oxygen or air/fuel ratio sensor, regardless of design or number of wires. This test is extremely valuable when diagnosing fuel trim issues, when the accuracy of the oxygen sensor is in question.
Engine Performance Diagnostics chapter 5 page 4, and chapter 14 page 9
Symptoms
– intermittent rough idle
– intermittent stalling
– long/extended cranking time
– start/stall
– poor gas mileage
Fix
– replace leaking fuel pressure regulator
Tests shown
– using scan data to monitor fuel trims
– interpreting short and long term trims
– performing an O2 response test
– how to test for a leaking fuel pressure regulator
Tools used
– scan tool
Playlist
– (Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing
https://www.youtube.com/playlist?list=PLD2809EEC7BAAF989
Related videos
– Chevy 4.8 Oxygen Sensor Test (fixed rich signal P0172, P0175)
– How to identify a bad oxygen sensor (signal fixed rich)
– System Too Rich P0172, P0175 from a blown O2 heater fuse (Jeep)
– How to simulate a rich & lean O2 signal (PCM response testing)
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 right here on YouTube. 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!
Post time: Jun-20-2017