Quote:
Originally Posted by zeke
This weekend, my air filter housing supports broke loose. All the rattling knocked the breather tube loose from the air intake manifold. (It was still attached at the valve cover). I immediately noticed a decrease in power, a loud exhaust type sound, and a HUGE increase in blowby. I fixed the mounts, and reseated the breather tube, and the problems seemed to have gone away. So maybe just check to see that your crankcase ventilation is working properly.
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The loss of the breather tube from the intake manifold cannot affect the power of the engine or the amount of blowby produced by the engine.
My guess is that the excessive noise caused you to believe the power was reduced (because your right foot naturally came off the pedal) and the additional blowby was simply the typical blowby that is now escaping into the atmosphere rather than being ingested into the engine.