2003 Impala 3400 V-6.

How to perform an exhaust back-pressure test.

Engine Performance Diagnostics chapter 1 pages 8 & 28

symptoms 50

  • very low power (could not accelerate past 30 mph)
  • pinging and detonation

fix 50

  • replace the restricted catalytic converter

test shown enh 50

  • O2 sensor reading at wide open throttle (shows fuel delivery and direction for our low power complaint)
  • exhaust backpressure test using a gauge installed in the upstream O2 port

Tools used

  • scan tool
  • exhaust back-pressure gauge

end faq

Playlist

(Chapter 1) Misfire ID, Compression Test, Vacuum Leaks, Fuel Trim, Head Gasket, Restricted Exhaust, Low Power, DVOM

Related videos:

How to test for a restricted exhaust using the DPFE sensor on a Ford:

How to test for a plugged exhaust (picoscope & psi transducer):

Exhaust Backpressure Testing (known bad compared to known good):

end faq


For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available 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. 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!

 

You have no rights to post comments