I'm Dusty from RepairPal's Car Genius team; I'm here to help!
Given that the problem gets slightly better with the vent tube hose disconnected, it indicates that the crankcase pressure might be too high.
Excessive blow-by can indicate worn or improperly seated piston rings or cylinder wall issues.
Blow-by occurs when combustion gases escape past the piston rings into the crankcase, which might explain why the vent tube blew off and is now forcefully blowing air.
The PCV system is designed to mitigate blow-by but has a breaking point.
A compression test to check the health of the piston rings and cylinders is a good starting point, followed, if necessary, by a cylinder leak-down test to confirm those findings.
Ensure the PCV (Positive Crankcase Ventilation) system functions correctly, as a stuck or faulty PCV valve can exacerbate crankcase pressure issues.
Additionally, the PCV system or related hoses should be inspected for blockages (which could increase the pressure) and possibly cause the vent tube to blow off.
If the issue persists, seeking guidance from a professional can help identify the specific cause; sometimes, a comprehensive diagnosis is the most effective approach.
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