Strange Misfire - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 10-19-2009
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Strange Misfire

Well I have a good one this time. Well at least for me anyway. I just bought my 2000 Ranger about four months ago and havent had much for issues.
Well I was driving at about 45 mph the other day and noticed a miss and then it downshifted and really it started to missfire. I figured maybe plugs or wires. "I always like to change these on vehicles that are new to me". I installed new plugs (gapped at .044) and new wires. Changed the wires one at a time to make sure I didn't screw that up. Also checked the Clymers service manual to make sure they were correct to start with. well the plugs were way shot. They had burned way out of spec. This made me think that I had the problem solved. Drove the truck for a few days with no issue and then it did it again. Oh yeah I failed to mention the OBD2 code of PO305. Missfire on hole number 5. Checked both the plug and wire to make sure they are ok. They both check out fine with the multi-meter.
Have been surfing the forums to see if this is an issue that crops up on some fords. Havent found much and not much that has helped.
I have cleaned the MAF. Installed a new air filter. Checked for any vacuum leaks there are no leaks.
I just had an issue with the battery cables being corroded and not making good contact. I have cleaned that posts and installed new terminal ends on the cables. Also checked the ground connections on the truck. I was thinkin that maybe a bad ground could be causing an issue, but they are all ok.
Any body have any questions or any ideas let me know. I have been working on cars and trucks for a long time and this one is pissin me off. Thanks Brian
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Old 10-20-2009
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Oh yeah. I have also changed the coil and that made the problem worse for awhile. After about two days driving back and forth to work the issue went away. It started missing a few days later and then it came out of it while I was driving at about 40 mph. Now it comes and goes and I am totally confused. Any help would be great. Thanks Brian
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Old 10-21-2009
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Try a different brand of gas. Fill up with premium from a major station and see if this helps. Your cats aren't clogged up are they? I'd check your O2 sensors as well.
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Old 10-21-2009
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Well I never even thought about the cats. If they are plugged it would make sense. I have changed brand and grade of gas several times since this has started and didn't see any change. I will be checking the cats and o2 sensers as soon as I can and let you know whats up there. Thanks Brian
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