i just installed new engine. it started right up and idled perfect for about 20 minutes and i rev it just a bit and it sounded like something blew off and the loudest vacuum leak sounding racket started. i finally realized it had blown the vent tube hose off and is blowing so much air you cant even hold your finger close to the vent tube. now it doesnt wanna start and when it does it idles so rough and it wont take acceletration
What makes this problem better or worse?
it gets a little better when you start it with the vent tube hose already disconnected
How long has your 2010 GMC Acadia had this problem?
RepairPal Certified shops can diagnose and repair your 2010 GMC Acadia. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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.
If you have any other questions or would like help finding a RepairPal Certified shop in your area, call us!
877-913-1554
