Episode 181

full
Published on:

9th Apr 2025

John Thornton Part 1 [E181]

Thanks to our Partner, NAPA Autotech Training

Diagnosing the Aftermarket A to Z website

Show Notes:

Introduction & Sponsor Message

  • Sponsored by NAPA AutoTech Training – Helping shops turn general technicians into profitable team members.
  • Matt introduces John Thornton, a highly respected instructor and presenter in the automotive industry.

Early Days & Mentorship

  • Matt and John reminisce about their first meeting in January 2020 at a training event in Minneapolis.
  • John’s early influence through his Underhood Service Magazine columns, which shaped Matt’s diagnostic approach.
  • Key articles that impacted Matt:
  • Trigger Modes (Auto vs. Normal/Lab)
  • In-Cylinder Pressure Testing (using a Fluke PV-350 transducer)
  • Current Probe Diagnostics (Fluke ADI-110S)

Diagnostic Awakenings

  • John’s guidance helped Matt diagnose a shorting fuel injector on a 1987 Chrysler Conquest Turbo, leading to a deeper understanding of inductive kick.
  • Importance of post-repair testing to solidify learning.

Documentation & Knowledge Sharing

  • John’s method of annotating wiring diagrams and keeping physical file cabinets for quick reference.
  • Transition from paper-based documentation to digital tools (e.g., PicoScope’s annotation features).

Evolution of Service Information

  • From Chilton/Motor manuals to Mitchell on Demand (disc-based) to modern OEM online portals (Toyota, Chrysler, BMW).
  • The power of hyperlinked wiring diagrams and 3D connector views in OEM service info.

Training & Public Speaking

  • John’s philosophy on preparation: Rehearsing presentations multiple times to ensure smooth delivery.
  • Handling technical difficulties (e.g., projector failures) by staying adaptable.
  • Encouraging techs to share knowledge through platforms like Vision Hi-Tech Training & Expo.

Teaser for Part 2

  • Next episode dives deeper into CAN bus diagnostics, multiair systems, and more training insights.

Key Takeaways:

  • Diagnostic growth comes from post-repair analysis and documentation.
  • Service information has evolved dramatically—OEM portals now offer unparalleled detail.
  • Effective training requires relentless preparation and adaptability.

Listen to Part 2 next week for more insights!

Thanks to our Partner, NAPA Autotech Training

NAPA Autotech’s team of ASE Master Certified Instructors are conducting over 1,200 classes covering 28 automotive topics. To see a selection, go to napaautotech.com for more details.

Contact Information

The Aftermarket Radio Network: https://aftermarketradionetwork.com/

Remarkable Results Radio Podcast with Carm Capriotto: Advancing the Aftermarket by Facilitating Wisdom Through Story Telling and Open Discussion. https://remarkableresults.biz/

Diagnosing the Aftermarket A to Z with Matt Fanslow: From Diagnostics to Metallica and Mental Health, Matt Fanslow is Lifting the Hood on Life. https://mattfanslow.captivate.fm/

Business by the Numbers with Hunt Demarest: Understand the Numbers of Your Business with CPA Hunt Demarest. https://huntdemarest.captivate.fm/

The Auto Repair Marketing Podcast with Kim and Brian Walker: Marketing Experts Brian & Kim Walker Work with Shop Owners to Take it to the Next Level. https://autorepairmarketing.captivate.fm/

The Weekly Blitz with Chris Cotton: Weekly Inspiration with Business Coach Chris Cotton from AutoFix - Auto Shop Coaching. https://chriscotton.captivate.fm/

Speak Up! Effective Communication with Craig O'Neill: Develop Interpersonal and Professional Communication Skills when Speaking to Audiences of Any Size. https://craigoneill.captivate.fm/

Show artwork for Automotive Field Theory

About the Podcast

Automotive Field Theory
From Automotive Diagnostics to Metallica and Mental Health
Automotive Field Theory explores the forces that shape automotive repair, including the ones measured with a meter or oscilloscope and the ones that cannot be found on a wiring diagram.

Hosted by automotive diagnostic specialist, shop manager, and instructor Matt Fanslow, the podcast begins in the automotive aftermarket but rarely stays inside its traditional boundaries. Diagnostics, electricity, technology, leadership, psychology, economics, game theory, history, music, movies, family, and human behavior may appear unrelated. Look closely enough, however, and connections begin to emerge.

A vehicle may arrive with a technical fault, but the work surrounding it is rarely technical alone.

Information is incomplete.

People make decisions under pressure and uncertainty. Incentives shape behavior. Standards gradually drift. Good intentions produce unexpected results. The official process may say one thing while the system quietly rewards another.

Automotive Field Theory is an attempt to understand those interactions.

Drawing from real diagnostic work, shop management, industry conversations, personal experience, and an occasionally inconvenient level of curiosity, Matt examines not only how things work, but why they work that way, how they became what they are, and what apparently unrelated subjects might teach us about repairing vehicles, leading people, running businesses, and improving the automotive industry.

Some episodes begin with a failed component. Others begin with Metallica, quantum physics, professional wrestling, a historical disaster, a round of golf, or a question that refuses to leave Matt alone.

Eventually, they all enter the same field.