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Do you have a boost gauge to see what the turbo is doing? What year of truck do you have? A little more back ground into your problem please.
 

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Premium Member
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You can plumb a gauge into the intake horn by drilling and tapping it or with a boost bolt that some places carry.

Also try doing a search for manometer test in this powertrain forum to see if it is a test you want to try yourself. That's if you're thinking the blow-by is excessive.
 
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