Diagnosing the Aftermarket A to Z

Thanks to our Partners, Pico Technology, and AutelWatch Full Video EpisodeIn this episode of Diagnosing the Aftermarket A to Z, Matt Fanslow starts with a case study on a 2000 Ford Excursion with a 7.3L Power Stroke that came in with a severe lack of power. What began as a fuel delivery problem turned into a more interesting diagnostic puzzle involving a P1280 injection control pressure sensor code, an aftermarket ICP sensor, and a fault that appeared to happen not during cranking or running, but after key-off.The case becomes a practical example of why testing under actual operating conditions matters. Static tests can pass, scan data can look normal, and a meter may never show the event. In this case, the scope captured something the rest of the tools could easily miss.Matt then shifts into a listener question about artificial intelligence, especially large language models like ChatGPT, Gemini, Claude, Grok, and others. The concern is not simply whether AI is good or bad, but whether people, especially kids, may begin outsourcing too much thinking, writing, problem-solving, and confidence to these tools.The episode lands on a recurring theme: tools are not the problem by themselves. The question is how they are used, what skills may atrophy when they are overused, and whether individuals, families, businesses, industries, and society are willing to think more carefully and evidence-first about the long-term effects.Topics Covered2000 Ford Excursion 7.3L Power Stroke Case StudyMatt discusses a 7.3L Power Stroke with a major lack-of-power concern. The initial issue was tied to the low-pressure fuel supply side. A basic fuel pressure test had passed, but it had not been tested under the actual conditions where the symptom occurred.That led to a larger point: testing at idle, key-on, or during cranking is not the same as testing under load.The vehicle ultimately had damaged pickup screens and debris in the fuel tank. Cleaning the tank and replacing the failed components solved the fuel supply issue, but another problem remained.The P1280 ICP Sensor ProblemAfter the fuel supply repair, the truck began setting a P1280 code, related to the injection control pressure sensor circuit reading low.The strange part was that the voltage looked normal:Key-on engine-off voltage looked normal.Cranking voltage did not drop.Five-volt reference stayed stable.Sensor ground stayed stable.The signal looked fine while running.The meter never really caught the failure.The scope eventually revealed the important event: after key-off, the ICP signal voltage would sometimes dip nearly to zero. That appeared to be enough for the PCM to set the code on the next key cycle.Scope vs. Meter vs. Scan ToolThis case is a useful reminder that each tool has limits.A scan tool may not refresh fast enough or may stop collecting data after key-off. A meter may technically sample quickly, but the display may not show a short event clearly. The oscilloscope was the tool that made the failure visible.The point is not that one tool is always better. The point is knowing which tool fits the question being asked.Aftermarket Sensor BehaviorThe aftermarket ICP sensor appeared to produce a rebound effect after shutdown. Matt compares the behavior to something like inertial rebound, a concept familiar from certain pressure pulse sensors and piezo-style tools.The OE Motorcraft sensor did not reproduce the same behavior. Replacing the aftermarket sensor with the OE sensor corrected the issue.Main Diagnostic TakeawaysTesting has to match the failure condition. A fuel pressure test that passes at idle does not prove the fuel system can keep up under load.A sensor can create a failure outside the moment most people are watching. In this case, the important event seemed to occur after key-off.A scope can reveal details that a scan tool or meter may miss, especially when the event is brief, intermittent, or happens outside normal observation windows.Aftermarket parts can fail in ways that are not obvious or traditionally “failed.” The sensor was not simply dead. It behaved incorrectly under a specific condition.Listener Question: AI, Kids, and Skill AtrophyThe second half of the episode deals with a listener question about artificial intelligence and whether it may negatively affect people, especially kids.Matt narrows the discussion to what most people mean by AI in everyday conversation: large language models. These tools can write, summarize, explain, organize, and suggest. That makes them useful, but it also creates a risk.The concern is skill atrophy. When people lean too heavily on AI to write, think, summarize, diagnose, or explain, they may lose confidence or sharpness in those same areas.AI TakeawaysAI does not have to be viewed as the collapse of civilization, but it also should not be treated casually.The better question is not “Is AI good or bad?” It is: What happens when people outsource too much of their thinking to it?Matt argues for an evidence-based approach. Families, schools, businesses, industries, and society should be asking harder questions about long-term effects instead of simply letting the tools spread and hoping it all works out.Neuroplasticity matters here. Even if people become overdependent on AI, the brain can adapt again. Skills can be rebuilt. Confidence can be recovered. But that depends on whether people recognize the problem and choose to do something about it.Thanks to our Partner, Pico TechnologyAre you chasing elusive automotive problems? Pico Technology empowers you to see what's really happening. Their PicoScope oscilloscopes transform your diagnostic capabilities. Visit PicoAuto.comThanks to our Partner, AutelFrom drivability diagnostics and TPMS service to ADAS and advanced safety systems, Autel helps technicians follow OEM procedures and repair with confidence. Learn more at Autel.comContact InformationEmail Matt: mattfanslowpodcast@gmail.comDiagnosing the Aftermarket A - Z YouTube ChannelThe Automotive Repair Podcast Network: https://automotiverepairpodcastnetwork.com/Remarkable Results Radio Podcast with Carm Capriotto: Advancing the Aftermarket by Facilitating Wisdom Through Story Telling and Open Discussion. https://remarkableresults.biz/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/

Thanks to our Partners, Pico Technology, Autel, and Independent Wrench JobsWatch Full Video EpisodeMatt opens with a home-repair “birthday gift” project that spirals from a simple bathroom refresh into a full-blown floor/toilet/subfloor/plumbing/trim/electrical ordeal. What starts as a kind gesture turns into a week-long marathon of improvisation, problem-solving, and unexpected complications.From there, he ties the experience directly into life in the repair shop: helping someone out, taking on a difficult job, making an exception, or trying to do the right thing can sometimes backfire in spectacular fashion. But the real point of the episode is deeper than the saying “no good deed goes unpunished.” Matt argues that the phrase feels true mostly because of bias, we remember the painful, sideways jobs and forget the many times helping people went just fine.The takeaway: keep doing the good deeds. The occasional disaster isn’t punishment for being helpful; it’s just part of the game, and our brains are wired to remember the bad outcomes more vividly.Key Topics CoveredA “simple” bathroom repair that became a major renovationHidden damage and how small symptoms often point to bigger problemsImprovisation and mechanical aptitude outside your normal fieldHow this mirrors difficult jobs in automotive repairThe “charity case” / exception job that turns into a nightmareBias, memory, and why bad outcomes stick harder than good onesWhy you should still help people when it makes senseMain TakeawaysSmall problems often hide bigger ones. (At home and in the shop.)Doing the right thing can get messy — that doesn’t make it wrong.We remember painful exceptions more than routine wins.Bias can distort how we judge “helping people.”Keep helping when you can. The bad outcomes are memorable, but they are not the whole story.Notable Moments / Discussion HighlightsMatt’s “cheap labor” role in a birthday bathroom remodelDiscovering a corroded toilet flange and badly rotted floorReinforcing unsupported bathtub flooring and rebuilding structurePlumbing improvisation under a new vanityUpgrading to GFCI in a bathroom that didn’t have oneThe repair-shop analogy: the customer who arrives after multiple failed attempts elsewhereMaking exceptions (like customer-supplied parts) and regretting the one time it blows upWhy “no good deed goes unpunished” feels true — because bad outcomes are easier to rememberClosing encouragement to keep doing good work and helping peopleQuotes / Lines Worth Pulling“No good deed goes unpunished.” (episode theme / setup)“I make it up as I go.” (great humility + problem-solving angle)“More importantly, it doesn’t leak.”“It’s not because it’s a good deed. It was just going to happen eventually anyway.”“It lines up with our biases, and gives us a reason to complain.”Thanks to our Partner, Pico TechnologyAre you chasing elusive automotive problems? Pico Technology empowers you to see what's really happening. Their PicoScope oscilloscopes transform your diagnostic capabilities. Visit PicoAuto.comThanks to our Partner, AutelFrom drivability diagnostics and TPMS service to ADAS and advanced safety systems, Autel helps technicians follow OEM procedures and repair with confidence. Learn more at Autel.comThanks to our Partner, Independent Wrench JobsIndependent Wrench Jobs is a new, tech-only community to help you find better independent shops—fair dispatch, steady work, real leadership. No games.Built by Technician Find—serving the industry since 2017. Join free at IndependentWrenchJobs.comContact InformationEmail Matt: mattfanslowpodcast@gmail.comDiagnosing the Aftermarket A - Z YouTube ChannelThe Automotive Repair Podcast Network: https://automotiverepairpodcastnetwork.com/Remarkable Results Radio Podcast with Carm Capriotto: Advancing the Aftermarket by Facilitating Wisdom Through Story Telling and Open Discussion. https://remarkableresults.biz/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/

Thanks to our Partners, Pico Technology and AutelWatch Full Video EpisodeMatt answers listener emails about oscilloscope aliasing—what it is, whether all scopes can do it, and how it can trick you into diagnosing failures that aren’t real. Using a “pegboard and golf tees” mental model, he explains how a digital storage oscilloscope samples voltage, stores it in memory, and then reconstructs what you see on-screen. The key takeaway: aliasing isn’t magic, it’s math—specifically the relationship between sample rate, timebase, and memory buffer. He also explains why some scopes (especially Snap-on) behave differently than Pico-style workflows, and how misunderstanding that screen-to-buffer relationship can create fake-looking “dropouts.”Who This Episode Is ForAnyone using a handheld/PC-based automotive DSO (Pico, Snap-on, Autel, etc.)Techs chasing intermittent cutouts, crank/cam dropouts, injector events, CAN glitchesAnyone who has ever said: “The waveform looked wrong… but the fix didn’t fix it.”Key Topics CoveredWhat aliasing is (in plain language): the scope fails to accurately reconstruct the waveform you’re testing.Can all oscilloscopes alias? The spicy answer is yes, they all can—especially digital scopes—depending on setup and limitations.Analog vs. digital (audio analogy): Digital sampling is like digital audio—there are “samples,” and reconstruction depends on how well you capture the real signal.The “pegboard model” for DSO operation: Up/down holes = voltage levels (vertical resolution). Left/right holes = time positions (sample points in memory). The scope measures voltage, then “plants a peg” in memory and connects the dots.Vertical resolution vs. time performance: 8-bit can look stair-steppy. 12/16-bit improves vertical accuracy. But most real-world failures come from time-domain limitations (sample rate + memory dynamics)Sample rate vs. buffer size (why scopes “fall apart”): Put too little time on screen → not enough samples to define the signal. Put too much time on screen → scope rejects/skips samples because the buffer can’t hold it all. Either way: the displayed waveform can become fiction.How aliasing creates “phantom dropouts”: Gaps that look like crank sensor dropouts or reluctor issues. Can send you straight into the diagnostic swampWhy Pico changed the game: Early Pico automotive scopes stood out because they brought big memory buffers to real shop problems. Capture longer events accurately, then zoom in for detailSnap-on screen/buffer behavior is different (and people get burned): Snap-on scope often shows a “window” into a buffer (buffer bar flying across). You don’t “zoom in like Pico”; you effectively set detail first, capture the event, then zoom out to find it and return to your detail level. Misunderstanding this is a common cause of “dropouts” that are really aliasing/misuseThe Big TakeawaysAliasing can make a good tech chase a bad story.The waveform on-screen is an interpretation, not a photograph.Know your scope’s strengths: Some are built for speed, some for memory, some for both—but your settings decide your fate.If you’re hunting an intermittent: Your success depends on matching: expected event speed, sample rate, memory depth, the scope’s display/buffer behavior.Practical “In-the-Bay” TipsIf the trace shows perfectly suspicious gaps: question your timebase, question your effective sample rate, verify with a different capture strategy (less time on screen, more sample rate, different scope mode)Don’t trust a dropout unless: it repeats consistently under the same conditions, and you can capture it without stretching timebase beyond what your scope can support.Learn your platform’s workflow: Pico-style: capture longer, freeze, zoom in. Snap-on-style: capture detail first, trigger/freeze, then zoom out to locate the eventMentioned / Referenced (People + Tools)Pico TechnologyAutelOlder scope references: Fluke 90-series, TektronixTraining/class voices mentioned: Harvey Chan, John Thornton, Scott Manna, Tim Iezzi, Ira Waldman, Scott ShottenThanks to our Partner, Pico TechnologyAre you chasing elusive automotive problems? Pico Technology empowers you to see what's really happening. Their PicoScope oscilloscopes transform your diagnostic capabilities. Pinpoint faults in sensors, wiring, and components with unmatched accuracy. Visit PicoAuto.com and revolutionize your diagnostics today!Thanks to our Partner, AutelFrom drivability diagnostics and TPMS service to ADAS and advanced safety systems, Autel helps technicians follow OEM procedures and repair with confidence. Learn more at Autel.comContact InformationEmail Matt: mattfanslowpodcast@gmail.comDiagnosing the Aftermarket A - Z YouTube ChannelThe Automotive Repair Podcast Network: https://automotiverepairpodcastnetwork.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/

Thanks to our Partner, Pico TechnologyWatch Full Video EpisodeMatt uses the movie Mr. Baseball (Tom Selleck as Jack, an aging Yankees player traded to Japan) as an analogy for life in the automotive repair world—especially for veteran mechanical/technical specialists whose bodies start breaking down and whose production (and pay) can drop as a result. The core theme: your role can evolve from “hour-cranker” to leader/mentor, but that requires radical honesty, ego-checking, and intentional changes—from physical maintenance to skill expansion to management systems that properly reward wisdom.Key points & takeawaysThe “Mr. Baseball” analogyJack believes he’ll dominate, but reality shows a hole in his swing and a body that’s not keeping up.His old talent used to hide the problem—until it doesn’t.The turnaround begins when he accepts reality, retrains, and recommits.Auto repair parallel: age vs. mileageIt’s not always “age”—it’s the mileage, injuries, wear, and accumulated strain.As bodies degrade (knees, backs, shoulders, hips, neck), production drops, and pay plans tied heavily to output can punish experience.Ego check: redefining valueWhen you can’t “crank hours” like you used to, value doesn’t disappear—it changes.Veterans often become natural leaders even if they don’t recognize or accept it.Leadership, mentoring, and stabilizing the team have real economic value—if the organization is willing to see it.Management responsibilityShops can’t afford to “cast blind eyes” to what veterans contribute beyond billed hours.The goal is optimizing the whole organization (the unit), not just individual output.If compensation and structure ignore mentoring/leadership value, the industry risks driving out the people who make everyone else better.Action steps for the veteran specialistTake care of the body: whatever works—massage, chiro, yoga, tai chi, mobility work, sleep/mattress upgrades, recovery habits.Expand skill sets into areas that are less physically taxing but high value (systems, diagnostics, workflow support, training others).Be honest and matter-of-fact about your limitations and your value—ask for role adjustments when needed.Culture shiftChecking egos at the door isn’t weakness—it’s how you stay in the game longer.The best teams rally when leaders own their shortcomings and recommit—same in the shop.Memorable lines / quotables“It isn’t the age… it’s the mileage.”“You’ve been getting away with it because talent covered it—until it didn’t.”“Awareness sucks… but it’s the job.”“The unit matters—the entire organization being productive, valuable, and profitable.”Listener challenges Identify your “hole in the swing”: what used to be easy that you’re now compensating for?Write down 3 ways you add value that aren’t billed hours (mentoring, process improvement, comebacks prevented, training).Pick one body-maintenance habit you’ll commit to for 30 days.Resources mentionedMovie: Mr. Baseball (Tom Selleck)AudienceVeteran mechanical specialists and technical specialistsShop owners/managers designing pay plans and rolesYounger specialists who want to understand the long gameThanks to our Partner, Pico TechnologyAre you chasing elusive automotive problems? Pico Technology empowers you to see what's really happening. Their PicoScope oscilloscopes transform your diagnostic capabilities. Pinpoint faults in sensors, wiring, and components with unmatched accuracy. Visit PicoAuto.com and revolutionize your diagnostics today!Contact InformationEmail Matt: mattfanslowpodcast@gmail.comDiagnosing the Aftermarket A - Z YouTube ChannelSubscribe & Review: Loved this episode? Leave a 5-star review on Apple Podcasts and SpotifyThe Automotive Repair Podcast Network: https://automotiverepairpodcastnetwork.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/

Thanks to our Partner, Pico TechnologyWatch Full Video EpisodeComebacks. Rechecks. Catastrophic parts failures. The stuff that makes everyone’s stomach drop. Matt makes the case that a big part of management’s day-to-day job is not “policing people,” but acting like an investigator—leading with genuine curiosity to figure out what actually happened and what should change.Using Dr. W. Edwards Deming’s framework, Matt breaks problems into two buckets:Common cause: Variation that’s built into the system (processes, tools, training, information flow, software, vendors, documentation, workflow chaos, etc.). These problems are repeatable—and if you don’t change the system, they’ll happen again.Special cause: A true one-off—rare, hard to predict, not systemic. Sometimes the correct response is support, not a giant policy overhaul.The goal: build trust, reduce fear, and improve the shop over time through “constancy of purpose”—not knee-jerk blame.Key Talking Points & Takeaways1) Management’s role when things go wrongBe an investigator, not a prosecutor.Start with: What happened? Why did it happen? What made it easier to fail than succeed?2) Deming’s lens: common cause vs. special causeMost problems are common-cause (system-driven), not “someone screwed up.”Mislabeling causes creates chaos:Treating common-cause problems like special-cause ones = scapegoating, fear, repeated failures.Treating special-cause problems like common-cause ones = overcorrecting, unnecessary rules, wasted effort.3) Examples of common-cause “system” failures (shop edition)Torque wrench out of calibration.Scan tool software out of date / tooling gaps.No real shop management system (handwritten tickets, misreads, manual re-entry).Process interruptions / constant context switching.Cheap unknown parts sources creating avoidable risk.Lack of SOPs, training, or accessible info.4) What a real special-cause looks likeA normally reliable part fails unexpectedly (the one “bad water pump” out of hundreds).A rare freak mistake by a trusted specialist with no obvious systemic trigger.Response: support the person, document it, monitor trends—don’t build policy off a unicorn.5) The trust factorWhen leadership doesn’t jump straight to blame, the team feels safer.Psychological safety improves communication, honesty, and long-term quality.Practical “Investigator” Questions for Comebacks/RechecksWhat changed (tools, parts source, workflow, staffing, interruptions, information)?Was the process followed—and if not, why was it hard to follow?Was the right info available at the right time?Was the equipment accurate and current?Is this repeatable (system) or truly rare (special cause)?What system change makes the “right way” easier and the mistake harder?Mentioned / ReferencedDr. W. Edwards DemingCommon cause vs. special cause variationDeming’s 14 Points“Constancy of purpose”Social media’s tendency to supercharge blame and hot takesListener Call-to-ActionMatt wants your thoughts and stories:Have you seen a shop handle a comeback well?What system fixes reduced repeat issues?Where does blame creep in—and how do you fight it?Contact InformationEmail Matt: mattfanslowpodcast@gmail.comDiagnosing the Aftermarket A - Z YouTube ChannelSubscribe & Review: Loved this episode? Leave a 5-star review on Apple Podcasts and SpotifyThe Automotive Repair Podcast Network: https://automotiverepairpodcastnetwork.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/