Number 3 is passanfer side 3rd one back, number 4 is first one on the drivers side
That is usually electrical. Depending in the vehicle, a spark plug wire, a spark plug, or a coil, if individual coil.
The spark plug firing order is ( 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 ) The engine cylinders / spark plugs are numbered 1 , 2 , 3 , 4 from front to rear on the passenger side of the engine and 5 , 6 , 7 , 8 from front to rear on the drivers side of the engine
Remove the intake manifold.
while looking at the front of the motor it is the middle plug on your left.
It is the second from the front on the driver side.
go through the fender well
Yes I just had to change number 3
It can be a defective spark plug, bad plug wire, burnt valve, blown head gasket, cracked head, or broken piston ring. A compression test will rule out any internal problems.
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Ford Expedition
The vehicles ECM (Engine Control Module) has detected number 3 cylinder is misfiring. Check number 3 spark plug, spark plug wire, distributor cap/rotor, compression, fuel injector (if applicable) and vacuum leaks.
Provides a spark for the #3 cylinder in order to burn the fuel and drive the piston down, thus providing power to that cylinder.