The best way to prevent the carbon-fouled spark plug is to directlycheck the condition of the spark plug. When removing the spark plug to check, use a clean soft cloth to clean the area around the spark plug pin. Use a dry spray to clean all the dirt accumulated in the spark plug. ...
@bz882 in your original post you said the injector fouled from the outside in. Now you say it fouled from the inside out. Which is it? Injectors fouled from the inside out can sometimes be restored to working condition with an injector cleaning solution connected to the fuel rail. bzb882...