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Spent 3 weeks chasing a misfire before my old shop teacher pointed at my spark plug gap tool
Had a 2012 Silverado in the bay with a rough idle that kept coming back, and I replaced coils, wires, and even swapped injectors chasing it. My old shop teacher stopped by and asked what I gapped the plugs to, and I said .060 like the sticker under the hood said. He pulled out his feeler gauge and showed me the tool I'd been using was worn out and reading almost .075 on every plug. Bought a new gap tool for $8 and regapped all 8 plugs to .060, and the truck ran smooth on the first crank. How often do you guys check your gap tools against a feeler gauge? I never thought about it until now.
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lucas9721h ago
When was the last time you actually checked a tool you use every day? This is the same deal as a tape measure with a bent hook, or a torque wrench that got dropped once and never gets checked again. The tool itself is the one thing people never think to test, so a small error quietly turns every job after that into a wild goose chase. I keep a feeler gauge in the same drawer as my gap tool now just so I can spot check it a couple times a year.
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