How to Test a GM 4-Pin HEI Ignition Module (Bench & In-Car)
9:04
YouTubeMy Mobile Mechanic 978
How to Test a GM 4-Pin HEI Ignition Module (Bench & In-Car)
Having a no spark issue on your GM engine? In this video, I show you exactly how to test a 4-pin HEI ignition module — both on the bench and while it’s still installed in the car. Whether you’re diagnosing a no-start, intermittent spark, or just want to know if your ignition module is doing its job, this step-by-step video walks you ...
47.5K viewsMay 18, 2025
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⚡ TESTING GM 4-Pin HEI Ignition Module, both on the bench and in the car. If your engine’s cranking but won’t fire — this is the first thing you should check. ✅ Power ✅ Ground ✅ Coil Negative Switching If it ain’t switching — it ain’t sparking. #IgnitionTrouble #NoSpark #HEIModule #GMTech #CarWontStart #DiagnosticsDoneRight Part 16 | My Mobile Mechanic / Auto Repair & Brake Replacement.
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