If the spark plug end (combustion chamber end) is coated with dry, black soot, it indicates weak spark or incomplete combustion. Note that this doesn't necessarily mean that the plug is bad; weak spark more often indicates a faulty coil or plug wire or, sometimes, an overfuelled cylinder.
Sometimes a weak spark in an internal combustion engine can be caused by dirty spark plugs. It can also be caused by weak distributor coils.
i know if you have the 5.4L V8 you will have coil packs. not spark plugs
spark plugs are located in the side of the head you remove them with a spark plug socket tip for you if you dont know where spark plugs are or how to remove them, i would get someone that does know, to do it or at least show you
You should replace the spark plugs when your car won't start first time but does eventually.
If you haven't already,Try replacing the plug wires and spark plugs and regap the plugs to factory spec.
When changing spark plugs it is important to know their location under the hood of the car. For a Toyota Rav4 the spark plugs are under the engine cover that has the car symbol on it.
It can be complicacated since on some models the spark plugs are difficult to get to but I would recommend to find the spark plugs first and then double check to make sure you know where they are.
if you don't know where plugs are,,,you shouldn't be touching them
Distributor cap & rotor button or spark plug wires may be bad. Coil could be weak.
it could be weak spark plugs.
It is important to know how the engine of a car works. In a car, the spark plug cables connect to the vehicles spark plugs.
when do you change spark plugs