Loud Vacuum Noise (Intake Manifold)
05-03-2007, 04:30 PM
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Loud Vacuum Noise (Intake Manifold) This is probably a dumb questions but here we go...
I am hearing a loud sucking sound coming from somewhere around the intake manifold. It seems to be towards the center or back of the manifold near the firewall. Could there be a vacuum leak back there somewhere or is the LS1 intake manifold that thin that it sounds like this all the time?
I am hearing a loud sucking sound coming from somewhere around the intake manifold. It seems to be towards the center or back of the manifold near the firewall. Could there be a vacuum leak back there somewhere or is the LS1 intake manifold that thin that it sounds like this all the time?
05-03-2007, 09:12 PM
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Well, does the car run rough or irradic? There is a large grommet at the back that houses the map sensor and the brake booster fitting. That could be the source but a leak like that would make it run like $#!+. Mine always sucks loudly but I believe it's from a larger t-body and free flowing intake.
05-08-2007, 09:41 PM
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Figured out the problem. It was the hard plastic vacuum line that controls the vents. It had come disconnected from the 90* elbow off the back of the manifold. 
