Quote:
Originally Posted by dkveuro
There's a theory that the injector pintal has a sweet spot and that if dismantled or flushed and tested on the bench, will turn the pintal out of the sweet spot and make the nailing noise when back in service......just a theory...just like evolution. 
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I think this explanation is for situations that lack a proper answer based upon combustion theory.
I'm leaning toward possible air that gets trapped in the hard lines. Maybe it takes a few miles to get rid of it all. I don't see how it's possible to damage the injector and, within 600 miles, have it repair itself via the use of a small amount of Power Service conditioner.
I did crack the hard line and attempt to bleed any and all air, so, this theory can be quickly shot down...........
