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Old 01-08-2011
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Misfire Problem. Suggestions?

I've got a 2002 ranger edge 3.0L. I've been getting random misfire, misfire in cylinders 1,3,5, and a p0171 which i think is a running lean on bank 1 code. has spark and compression on all cylinders, i'm fairly confident there isn't a fuel pressure problem. When the engine is at idle it is fairly smooth, but when i hit the gas it immediately backfires in the intake. It will also ping throughout the driving range, which i think might be more smaller backfires. I checked the vacuum pressure and it was steady at 16 pounds at idle and all the tests i could do with the vacuum pressure tester came up normal. I took the o2 sensors out and ran it to see if it was a backpressure problem but that did nothing. Anyone have any idea what could be wrong? I'm thinking a o2 sensor could be bad, don't really know what else to consider.
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Old 01-08-2011
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oh, and the truck has 137,000 miles on it and has had all its regularly scheduled maintanance
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Old 01-08-2011
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I had a similar problem wiht my 99 a few months ago, it turned out 1 of my plugs had a small crack in the ceramics. I still got spark from it, but it would give me random misfires and dead starts.
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Old 01-08-2011
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I've put new plugs and wires in the engine but it did not fix the porblem
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Old 01-08-2011
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I did too, and one of my replacement plugs had a faulty post.
then the one I got to replace that one was cracked as well...
3rd times the charm as they say
I would double check just to make absolutely sure.

also, take a look and see if there is spark from the wire onto the exhaust manifold, even after doing the changing of these things on my truck (new plugs/wires) I can still see some spark occasionally between the plug cap and manifold.
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Old 01-08-2011
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Fixed the problem. Somehow my coil pack had to wires in the wrong place. Which blows my mind because that was the same configuration its been in for at least 2 years and it just now started causing a lot of trouble. But now she is running better than ever!
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Old 01-08-2011
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heh
same thing happened to me except I got 1 wire wrong. and the same after effects too, ran better than it had in several yrs
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