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

Is your Chevrolet Sonic stalling, idling roughly, or hesitating off the line? Carbon buildup on the throttle body is a frequent cause, especially with short trips and stop-and-go driving. These deposits alter airflow and can trigger warning lights. With the Haynes manual, you’ll learn how to access and clean remove the throttle body for cleaning to restore smooth performance. Each print manual includes complete digital access for quick reference. Find your vehicle manual at haynes.com #HaynesMan