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I had the check engine light come on recently on my 2003 Ford Ranger 3ltr truck. The code was #2 cylinder misfire.
I replaced all the plugs and wires to no avail.
Today I had the code read as Random Misfire.
I measured the resistance from pin to pin on the coil and all my readings were less that 1.5 ohms. Is that a good reading?
I did a little reading and thought I might try some fuel injector cleaner. I went to the parts store and got some cleaner and added tha to a 1/4 tank of gas and then topped off the tank.
Can anyone think of what I might be trying next should this not work?
I noticed you don't have any replies, so I'll see if I can get things started.
Post All of the trouble code Numbers.
Since it takes air, fuel, spark & compression to make em run & you've tinkered with the spark part, that sorta leaves the fuel & compression part, Unless Murphy's Law is messing with you, like a faulty new plug wire, or plug!!!!
Ford doesn't have a spec on the coilpack resistance value, but 5 ohms or less on the coil pack primary is normal & the value you measured sounds right. The secondary should be in the 13-15K ohms range & on a V6, cyls 1/5, 2/6, 3/4 are paired together in the coilpack, so measure across those two pairs for the coilpacks secondary resistance reading. If your still in doubt about the coilpack, most autoparts stores can/will bench test it for electrical output at no cost, but with the work you've done & info you've posted so far, I don't think spark is your problem.
Anyway, you might try listening to the #2 fuel injector & valves with a stethoscope, or with a piece of tubing, broom handle, long scredriver, ect, if you don't have a stethscope in your diagnostic kit, to determine if you can hear any difference in that area from the other cyls valves, or fuel injectors sounds, in time with the miss, if you can feel or hear it.
I'm thinking maybe a sticking valve, or an acting out fuel injector.
Let us know what you find.
99 Ranger XLT 4dr 4x2 4.0L 5spd Auto 3.55L/S Payload Pkg2 Tow Pkg
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