sometimes
Yes, fouled spark plugs can cause engine shaking, and loss or power. I'm not sure about knocking but I'd guess that too.
Engine knocking can be caused by numerous things. Having the incorrect spark plugs, carbon deposits on the cylinder walls, and being low on engine oil may all cause a knocking sound.
yes
Wear. Fouled. Cracked.
A spark plug incapable of producing sufficient spark to ignite the air/fuel mixture.
Sound like a fouled spark plug.
Fouling spark plugs can happen when the tip temperature is insufficient to burn off carbon, fuel, oil or other deposits and causes spark to leach to metal shell...no spark across plug gap will cause a misfire. Wet-fouled spark plugs must be changed as they won't fire. Dry-fouled spark plugs can sometimes be successfully cleaned by bringing the engine up to the operating temp.
if the gap is too large it can make a weak or no spark condition witch can create a misfire. on the other hand if the gap is too small it can reduce the heat of the spark significantly witch can also create a misfire. both conditions may also result in fuel fouled spark plugs.
If the spark plug gap is too close, it can lead to a weak spark, resulting in incomplete combustion of the air-fuel mixture. This can cause engine misfires, reduced power output, poor fuel efficiency, and increased emissions. It may also lead to fouled spark plugs and potential engine knocking. Regularly checking and adjusting the spark plug gap is essential for optimal engine performance.
Yes
Fouled spark plug(s).
if the spark plugs are black because your car is running too rich. your plugs are fouled.