How do you check if your spark plug threads are bad?
I would like to know the most non-invasive method of checking this and also the most cheapest way to check this.
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Remove your spark plug wire primary leads. Spray the area around the spark plug with soapy water. Crank or run the engine and see if bubbles are formed. Perform this action with the engine cold and only run it for a little bit.
You didn't mention what car make model year you have. If the plugs are exposed on the sides of the heads the soapy water shouldn't cause any problems. If the plugs are recessed into the tops of the heads then be sure to blow the water out before removing the plug.