What would cause a sudden rattle in motor and oil on 1 plug. Was running fine

1998 FORD F-150
209,000 MILES
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RRAINS
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Running good, no noise turned off after driving. Crank back and bad rattle sound from motor. OBD code 1537 showed up. Went from fine to sounding like it's got something loose inside the motor. There is one plug that is got oil on it.
Apr 13, 2012 at 4:02 PM
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RASMATAZ
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Where is this rattling noise is mostly coming from the engine?
Apr 13, 2012 at 4:09 PM
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RRAINS
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Yes. All the sound is. I thought maybe rocker arm or something may have broke or come loose.
Apr 13, 2012 at 4:43 PM
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RASMATAZ
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Bring it in and have it further checked-sorry its really hard for me to hear it at this end
Apr 13, 2012 at 4:51 PM
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RRAINS
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It sounds like its knocking. I can't see that though. Running too good when I drove it. Overnight start knocking without even started? What about the excessive amount of oil on the plug? It's only on one.
Apr 13, 2012 at 4:56 PM
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RASMATAZ
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Check the compression on that cylinder
Apr 13, 2012 at 5:05 PM