Grinding noise....??
Laughing Gas
Joined: Dec 2009
Posts: 799
Likes: 13
From: East L.A.
As you sped up the vacuum pressure changed (normal). The re-occurance of the grinding at that time indicates there is still a leak somewhere in the 4x4 vacuum lines, or a bad IWE internal seal. Have you checked the two (one way air flow) check valves? They are often overlooked when trouble shooting.
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