Well, a cylinder is a hole, so you can't replace it... but there could be a few reasons why you have a mis-fire: Damaged spark plug wire
Fouled / damaged spark plug
Head gasket leak (unlikely)
Bad / burnt valves
Hole in a piston
Bad piston rings
Other things depending on the year and manufacturer of the engine... There are a bunch of tests you can run to determine what the problem maybe if you have the tools. You might try looking into an automotive forum for you make and model... chances are they've already got pretty lengthy discussion on it.
Cylinder #4 is misfiring in an engine with 4 or more cylinders. Engines have a firing order that is used to number the cylinders and it depends upon the engine which one is #4.
Standing in front of the car, it is on the bank of cylinders closest to the firewall and the one farthest to your right.
The number of a cylinder indicates the firing order of the spark in a sequence consistent with the number of cylinders.
Could be a bad plug, wire or coil.
Trouble code P0132 means: O2 Sensor (B1 S1) Voltage High
Number 2 cylinder is misfiring.
The number 5 engine cylinder is misfiring
2008 malibu 3.6 L code says PO302 misfiring Misfiring in number 2 cylinder. Could be an ignition problem with a bad spark plug or spark plug wire. Could also be a bad fuel injector. Could also be a mechanical problem such as a bad valve. Start with new plugs and wires.
The cylinders are numbered from left to right.
Its an in-line 4-cylinder, that means that all the cylinders are in a line. number four is on the right
The number four cylinder in a Subaru is found under the engine. There are 6 cylinders altogether.
The 2002 Mazda MPV 3.0 liter engine has four cylinders. The number four cylinder will be the very back cylinder.