This specific symptom indicates that the module has completely lost its ability to maintain the ignition circuit. This happens because the timing of the spark is no longer optimized, causing the engine to fire out of sequence.
Common Causes Behind GM HEI Ignition Module Failure
Using a multimeter, test the power supply to the ignition module while cranking the engine; a fluctuating or absent voltage signal points directly to the module or its wiring harness. Understanding the specific warning signs allows owners to differentiate between a faulty module and more complex problems like a seized starter or dead battery.
In these scenarios, the vehicle may need to be towed, as it typically refuses to turn over until the module is replaced or the system is reset, though the reset often proves temporary. Ignition Coil Overheating and Physical Damage A telltale visual symptom of a struggling system is an abnormally hot ignition coil.
Common Causes Behind GM HEI Ignition Module Failure
These modules are generally affordable and accessible, making them a common part in the GM aftermarket. When it begins to fail, the engine’s communication with the ignition system breaks down, leading to performance issues that can escalate from a minor nuisance to a complete immobilizer.
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