Question about Ford Explorer

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Hi there! I have a po-304 code keeps coming up on my scanner. The 1997 explorer 5.0L has a dead miss and it stinks of unburnt fuel? I have changed the the #4 spark plug and the coil pack, the plug wires are fairly new. It still runs the same? This came on rather suddenly also. Thanks for your time!

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  • Ford Master
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Have no idea as to what the fault could be here but first thing i would do here is to check the compression of the cylinder and see what you get

Posted on Mar 22, 2011

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  • Ford Master
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You have a scanner so i will assume that you know #4 is the passenger side rear spark plug.it could be a bad fuel injector for that cylinder or you may have a bad plug wire for that cylinder even if it is new(it happens),it also might be a bad plug(cracked insulator) or the gap closed on the plug,it could also be a bad valve in the cylinder.do a compression test and see.

Posted on Mar 22, 2011

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