Lifter Tapping or Stuck Valve?

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May 11, 2009 | 11:49 PM

JJ74B

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Lifter Tapping or Stuck Valve?

1999 ford F150 <O:p</O:p
V6 4.2<O:p</O:p
26,000 orig miles<O:p</O:p
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Truck has been sitting for a couple years and has been started once a month with no issues until recently. Tried starting truck and it sputtered and then a tapping sound started on passenger side. I think it is a stuck lifter or valve I really could use some help. <O:p></O:p>
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Here is what I have done so far,<O:p></O:p>
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1) I pulled the plugs and all were good but the middle plug on the passenger side (a little fouled/ Black color), replaced all 6 with new plugs.<O:p></O:p>
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2) checked spark, all were good.<O:p></O:p>
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3) did a compression test on middle cylinder on passenger side and had 150psi (not sure if that is normal).<O:p></O:p>
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3) Cleaned mass air sensor, new plugs, air filter, and fuel filter.<O:p></O:p>
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4) Put 3/4 qt marvel mystery oil in crankcase <O:p></O:p>
(Hoping to free a stuck lifter)<O:p></O:p>
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Thank you for your help<O:p</O:p