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post #1 of 6 (permalink) Old 04-25-2011, 10:25 PM Thread Starter
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Cylinder #5 missfire

Hello there, I have a 06 5.4 L F-150. 180,000 km. I have put this truck through its paces and now it is putting me through some. I am getting a cyl #5 missfire code. I have put a new coil plus a new plug in the hole, and still getting the code showing up with the telltale hesitation. It only happens when the truck is under load, like acceleration, climbing a hill, when I back off the peddle it corrects itself.
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post #2 of 6 (permalink) Old 04-25-2011, 10:36 PM
 
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That sounds like an interesting problem. Have you checked the wires?

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post #3 of 6 (permalink) Old 04-25-2011, 10:45 PM
 
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maybe something here to help you.
http://www.obd-codes.com/p0305

not sure what the exact code was you came up tho.

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post #4 of 6 (permalink) Old 04-26-2011, 02:29 AM Thread Starter
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I will check the wiring to the coil itself. plus do a compression test to eliminate the burnt exhaust valve or low compression. I did change out the #2 bank 2 oxygen sensor and that eliminated that code. I have my doubts that the catalytic converters are in good shape. I suspect they are plugged, so I best do a pressure differential test on those as well. I dont see how the plugged cat would affect just one cyl. though. Thanks for the help guys.
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post #5 of 6 (permalink) Old 04-26-2011, 10:46 AM
 
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Did you clear the codes after you fixed the bad coil and changed the plug?

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post #6 of 6 (permalink) Old 04-26-2011, 06:24 PM Thread Starter
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Quote:
Originally Posted by SKRWZ View Post
Did you clear the codes after you fixed the bad coil and changed the plug?
Yes, I cleared the codes but still after driving a few km's and trying to put a load on the engine it came right back. I am going to perform a compression test when I get back to work as well on that hole.
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