Leaking Fuel Pressure Regulator (symptoms and testing)

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
   • (Chapters 4 and 5) Fuel Trim and Oxygen Se...  

Related videos
Chevy 4.8 Oxygen Sensor Test (fixed rich signal P0172, P0175)
   • False Rich O₂ Sensor Diagnosis: Fuel Trims...  
How to identify a bad oxygen sensor (signal fixed rich)
   • How to identify a bad oxygen sensor (signa...  
System Too Rich P0172, P0175 from a blown O2 heater fuse (Jeep)
   • System Too Rich P0172, P0175 from a blown ...  
How to simulate a rich & lean O2 signal (PCM response testing)
   • How to simulate a rich & lean O2 signal (P...  

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-sc... 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.