Usually it's because SOMETHING found it's way into the combustion chamber and was bounced around for a while by the piston. Occasionally when that happens the foreign object will embed itself into the piston or find it's way out the exhaust valve. Whatever it is, it's not good.
Wrong size plugs. Or Incorrect rotating assembly.
If you mean that the wire came out of the boot, then pull the boot off of the spark plug and use a spark plug socket to remove the spark plug.
Spark plug wire not connected to spark plug? Spark plug wire connected to Wrong spark plug? Vacuum line disconnected? Bad spark plug or wire?
To change the spark plugs in a Chevy Celebrity: 1. Give the spark plug boot a twist to free it up from the spark plug, then pull on the boot to remove the spark plug wire from the spark plug. 2. Use a 5/8" spark plug socket with an extension and ratchet or breaker bar to loosen then remove the spark plug. 3. Set the gap on the new plug to .045" then screw it back into the spark plug hole in the head. Tighten the spark plug and replace the spark plug wire. I change the spark plugs one at a time to keep from getting the spark plug wires on the wrong spark plug.
Champion Spark Plug QC12YC
Give the spark plug boot a twist to free it from the spark plug then pull it off of the spark plug by the boot.
if you didn't space your spark plug right will they spark
It may be that the spark plug is dirty. Try cleaning it
Spark plug gap is where spark plug spark discharge is designed to take place. On a conventional spark plug, it is the area between the center and the ground electrode.
a broken spark plug der
The spark plugs on a Ford Explorer are replaced by first disconnecting the battery. Remove the spark plug using a spark plug socket. Replace with the factory recommended spark plug.
Spark Plug Wires? Remove them 1 at a time from the spark plug to the distributor or the ION pack, remove and replace the spark plug, add the new spark plug wire from the newly added spark plug to the distributor or ION pack.