Diagnostic Nightmares

The ugliest, most stubborn diagnostic jobs in the business. Real-world failures, hard-won fixes, and the kind of troubleshooting that keeps techs up at night. If you’ve ever chased a ghost in the wiring or lost hours to a mystery misfire, you’re in the right place. Learn from the worst so you can fix it fast and get paid (or out of your garage).

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2005 GMC Envoy’s PCM Failure – A Mechanic’s Diagnosis

Cranks but won’t start—and no codes? This 2005 GMC Envoy had all the signs of a fuel or spark issue, but the real culprit was the PCM. Here’s how one mechanic caught the glitch, fixed it, and got the truck running better than it had in months.

May 1, 2025 4 min read members

Diagnostic Nightmares

Ford's Wet Belt Timing System: A Mechanic's Worst Nightmare

Ford’s wet belt timing system is causing massive engine failures in EcoBoost models. Tool Addicts Anonymous breaks down how it works, why it fails, and what every mechanic should look for before the damage is done.

Apr 18, 2025 5 min read members