If your car won’t start, the first thing you should do is check the battery. If it’s good, then you’ll need to check the spark plugs. To do this, you’ll need a spark plug socket and a wrench. First, remove the spark plugs by turning them counterclockwise with the wrench. Next, use the socket to remove the plug from the engine. Finally, clean any dirt or debris that was on the plug with a rag or a brush. ..