Thanks to our Partner, NAPA Autotech 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 InformationEmail Matt: [email protected] the Aftermarket A - Z YouTube Channel Introduction:Fuel trims are a common topic in professional forums, classes, and diagnostics, often leading to bold diagnostic decisions.Matt shares his experience of quickly diagnosing vehicle issues using fuel trims, even before leaving the parking lot.Key Challenges in Discussing Fuel Trims:The more you learn about fuel trims, the more nuanced and complex the topic becomes.It’s difficult to generalize fuel trim behavior across all vehicles, as each system has unique characteristics.Fuel trims are just one piece of data that must be factored into a broader diagnostic process.What Are Fuel Trims?Definition: Fuel trims are adjustments made to the base fuel schedule by the engine control unit (ECU).Matt credits Matt Ragsdale on iATN for one of the best explanations he’s seen.Two Primary Fuel Systems:Speed Density Systems:Relies on the Manifold Absolute Pressure (MAP) sensor and engine RPM as primary inputs.Engine control algorithms tend to be more complex.Mass Airflow (MAF) Systems:Uses the Mass Airflow Sensor (MAF) and crank sensor (RPM) as primary inputs.Simpler in design compared to speed density systems.Modern systems often blend elements of both speed density and MAF systems.Closing Thoughts:Matt emphasizes the importance of understanding the nuances of fuel trims and how they vary across different vehicle systems.He plans to dive deeper into the topic in future episodes, providing more detailed insights and practical examples.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...

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