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Old 04-29-2014, 21:19   #1 (permalink)
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rough idle

hello all,
have a 2002 ranger xlt, 3.0, just the other day, it started to idle rough, check engine light came on, checked the code, says it's P0302, telling me that cylinder #2 is misfiring, changed the plugs, the all looked very good as far as how they were burning, but still has the rough idle, I checked the plug wires, they looked fine to me, no burn marks or hot spots, the car has 185,000 miles on it, other than this, the truck has been great, minor problems here and there, but for the most part, it's been great, any ideas? thanks for all your help

Last edited by jwko; 04-30-2014 at 04:13. Reason: corrected post for user
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Old 04-30-2014, 09:51   #2 (permalink)
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Re: rough idle

It's very likely the coil pack. They can crack too.
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Old 05-01-2014, 17:39   #3 (permalink)
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Re: rough idle

Did you also have a P0306 code?
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Old 05-10-2014, 11:28   #4 (permalink)
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Re: rough idle

Plug wires can be deceitful. They can look brand new, but be leakers, causing misfire without visible defect. You can run the engine in the dark to observe any arcing from the wires to the engine. Arcing can cause intermittent misfire.
Does this ignition require 'double platinum' electrode plugs? Some fire one plug normally, and fire the other of the pair 'in reverse'. You can replace the plugs with regular, but won't get the life on 1/2 of the set as the wearing electrode is being eroded faster on those plugs.
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