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1999 to 2003 7.3L Power Stroke Diesel
7.3L Power Stroke Diesel equipped Super Duty and Excursion.


 
 
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Old Mon, July 18th, 2011, 01:19 PM
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There is ALWAYS going to be some amount of blowby. That's what PCV and Crankcase Vents are for. The concern is not necessarily how much blowby you are getting (of course there can be too much), but whether or not it is a smooth stream (like blowing through a straw) or coming out in puffs (like making a motorboat sound with your lips). Uneven blowby indicates unusual wear (or worse, piston/ring damage) on a particular cylinder. This would also be evidenced by a compression test, but this is the poor man's way to identify possible engine problems.
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