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Autopsy performed yet ? I am curious to know if you lost any hard parts like I did. I don't think runaway is something we have to worry about under common use. More of a "I just worked on the IP and probably screwed it up" scenario. I see no reason to need a truck mounted system. Just have a...

You most likely dropped a liner. Do a compression test. Here is a picture of the tool you will need. It is an adapter made by Snap On for doing Mack engines.

it can pull enough air even without that. I blocked mine with the aircleaner disconnected and it still ran. All I can think of was the steel plate I used didn't provide enough seal and also I believe it started sucking oil past the turbo seals under vacuum.

Well you'll get to know your truck intimately when you change the engine. Post pics of the autopsy.

This is what happened to me too. I would bet you dropped a liner and the motor is junk.