Question about 2006 Ford F-150

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Engine has a knock on start up and under load .you can really here it on start up after it has sat for a few hours .it does get a little quieter but you can still here it a little even after engine is hot.i just changed oil to shafers and added an oil additive.

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Sounds like a main bearing is spun, or the camshaft bearing is worn out.

If you add an oil thickener it may quiet it down, but that's not a permanent solution if you plan to run it a long time.

Posted on Jul 31, 2010

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