Jeep misfire

[andyduran18]

hello all,

i’ve put in new spark plugs ignition wires, cap and ignition rotor but it seems like it’s still misfiring and no check engine light. any recommendations or suggestions.

thank you

 

[JKP]

Pull one plug wire at at a time and and narrow it down to the misfiring cyl. If it's just one cyl, you shouldn't notice much difference when you pull that wire.

Check the fuel injector connector.

Move that injector to another cyl and see if the misfire follows.

If the misfire is not just one cyl, it could be the crank sensor, or coil.

Also worth trying a can of fuel injection system cleaner.

Do you get it up over 3K RPM often? Carbon can build up on the valves, etc if it is lugged around all the time.