I have a 2000 ranger xlt 3.0 v6 pickup.I am getting a number 4 cylinder misfire.I have replaced the plugs,plug wires and vertical coil pack and I am still getting the same error any help appreciated.
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woo0
ANSWERS: 1
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You need three things to get a proper cylinder firing: 1) (enough) Fuel 2) (properly timed) Spark 3) (sufficient) Compression Since you replaced the common causes of an ignition failure, your next options are fuel or spark. A simple compression test should tell you if you have a mechanical failure in the cylinder (broken valve, cracked piston, etc.). Mechanical failure is unlikely because you'd probably have other symptoms. That leaves fuel as the most likely culprit. You could try swapping fuel injectors between #4 and another cylinder to see if the misfire moves with the injector. If it doesn't, then the injector is OK and you either have a wiring problem or the fuel injector "driver" circuitry in the engine computer is fried. If it is the computer, then change the injector too, because computer failure is usually caused by too-low resistance in the relevant output component. Good luck.
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