⚡ 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 12 | My Mobile Mechanic / Auto Repair & Brake Replacement.

⚡ 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 11 | My Mobile Mechanic / Auto Repair & Brake Replacement.

13K views · 214 reactions | Thinking about installing a Hyperspark ignition system on your car? Watch this video first! https://www.holley.com/brands/holley_efi/products/ignition/hyperspark_ignition_for_sniper_efi/ -Keith | Holley | Facebook