 What goes in this hole?, Throttle Body (manifold) |
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| ctc911ctc |
 Sep 10 2018, 01:46 PM
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#1
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Senior Member  Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States 
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I have all of my vacuum hoses connected (new) and I have a hole open on the throttle body. Any should this hole be left open?
For reference, I have added Mr. Bowlsby's nifty diagram. Also, please note that the picture of the throttle manifold (body?) is from ebay, could not get a good shot of mine. Thank you all 914-ers! Attached thumbnail(s)  Attached image(s) 
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| jcd914 |
Sep 10 2018, 01:50 PM
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#2
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
It is a welded in metal support tube that goes all the way through the plenum.
It does not open into the plenum, just goes through to the bottom. There is another one on the other side of throttle plate flange. The plenum often cracks around these tubes and creates vacuum leaks. Jim |
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| ctc911ctc |
Sep 10 2018, 02:10 PM
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#3
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Senior Member Group: Members Posts: 892 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States
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QUOTE(jcd914 @ Sep 10 2018, 01:50 PM)  It is a welded in metal support tube that goes all the way through the plenum. It does not open into the plenum, just goes through to the bottom. There is another one on the other side of the throttle plate flange. The plenum often cracks around these tubes and creates vacuum leaks. Jim Whew - this hole was driving me crazy - THANKS JIM! |
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| TheCabinetmaker |
Sep 10 2018, 04:11 PM
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#4
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
What he said. And, never leave a vacuum port uncapped, unless you like your idle at 2000rpm
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