Quote:
Originally Posted by petefias
GOLDCYLON is spot on. With a little vacuum gage/pump you can actually measure and see how well and SMOOTHLY the secondaries open. Often times they just stick a little that affects how fast they open. Unfortunately, you probably need to pull the plenum to hook it up. The vacuum pump is also an essential tool to identify and isolate any kind of small vacuum leak in the system.
Pete
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You have to pull te plenum to check them. There's no other way. But pulling the plenum is no biggy.