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  #1  
Old 10-04-2012, 11:12 PM
f150 all the way f150 all the way is offline
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p0308 engine code 09 f150

My 09 f150 pulled a p0308 cylinder 8 misfire code the other day. it has 90,000 miles on it and idk what to look for. I have checked the coil and its fine. im replacing plugs tomarrow hoping that it but i needed some info. It did it after i left the car wash and i guned it and the light started blinking then went off later on so the next day i tried to see if it would do it again and sure enough it did it started shaking when i let go of gas and lost power but sometimes it work perfectly fine and drives completely normal. WHy does it keep pulling the code and acting weird then i try it some other time and its fine...
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Old 10-05-2012, 04:57 AM
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There's no way to tel if a COP (coil over plug) is good or bad just by looking at it. You're likely misfiring because of a bad COP.
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Old 10-06-2012, 12:16 AM
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i switched the coil pack 5 and 8 and it still showed the same code
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Old 10-06-2012, 12:25 AM
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i was trying to check the wire from the coil today to see if it was bad cause the light keeps going on and off. could it be one of my sensors?
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Old 10-06-2012, 05:18 AM
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tim.burke.167
Thats the way my old 04 F250 5.4 work truck acted when a COP was going out( had well over 100k when this started IIRC). It would run OK then fall on its face. It happened to 2-3 other COP's before I "persuaded" our shop to just change the rest of them out, I was tired of bringing my truck in for a loaner every 3-4 weeks. Welcome to FTE, lots of friendly, knowledgeable folks here
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Old 10-06-2012, 08:23 AM
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thanks you so you think all of them are going out since i switched 5 and 8
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Old 10-06-2012, 08:44 AM
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tim.burke.167
No, I'm not suggesting you buy all 8. You could, I suppose- if you wanted to. I was just relaying my personal experience. I had 3 go out over the course of 3'ish months. That doesn't mean it would happen to yours
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Old 10-06-2012, 08:49 AM
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ok thanks could it be the plug by any chance if that not the problem or could it b the engine
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Old 10-07-2012, 08:09 AM
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tim.burke.167
Id start with the COP and go from there. I doubt its the engine. Keep us posted with your findings
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Old 10-08-2012, 06:27 PM
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If the coil was bad the misfire would follow it.
I would check the spark plug, it probably got water in the well and cracked the ceramic. You will see a black line (carbon track).
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Old 10-08-2012, 06:27 PM
 
 
 
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