There are many ways to visibly troubleshoot a vehicle's ignition administration module.
Any cracks or damage to the module's surface indicate a problem. Remove the module and inspect it for damage or cracks on the surface or around the mounting screws. If there is any visible damage, replace the module.
Study the module for a visible layer of grease or silicone on the back of it. Whether this film is absent, the module needs to be replaced.
Irregular Spark
Install a timing light and monitor the engine for an irregular spark while the light is operating. If you notice an abnormal spark, but the spark plugs do not look damaged, the ignition module may be faulty.
Cracks
The most exceptional department of a vehicle's ignition process, including a GM vehicle, is the ignition authority module due to it regulates all aspects of the ignition, including the Glimmer plugs. Mechanics manipulate a best diagnostic scope to button down any existing problems within the ignition operation, on the contrary whether you end not annex a scope, there are ways to visibly troubleshoot components of a GM vehicle's ignition operation.
