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throttle body vacuum ports

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Old Feb 17, 2008, 06:52 AM
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throttle body vacuum ports

Took my 03 EVO to the dyno yesterday @ 3SX. The tech there noticed one of the vacuum hoses was disconnected. Easy fix, reconnect the hose. Later in the day I decided to zip tie the vacuum hose to make sure it doesn't come off again.

I see three vacuum ports labeled P, E, and A. Port P is completely empty, no barb to connect a vacuum hose. Is this normal? Please see attached photo.
Attached Thumbnails throttle body vacuum ports-tb_vac_ports2.jpg  
Old Feb 17, 2008, 09:06 AM
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Yes, its normal:



Old Jan 23, 2010, 04:17 PM
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Although I love when threads are brought back from the dead i have a couple of questions, I recently bought a TB from a member of the site and the vacuum barbs were welded shut.

1.) Is there any gain from welding these barbs shut?
2.) what should I do with the vacuum lines that should be attached to these barbs?

I'm also experiencing a high idle which I assume is because these vacuum lines are not connected
Old Jan 23, 2010, 04:20 PM
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It's normal, high idle usually is a vacuum leak, just slip em' back on and like you said throw a few zip ties on there, good to roll.
Old Jan 23, 2010, 04:23 PM
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I wish I could but the barbs are literally cut off and welded shut, could I cap both lines?
Old Jan 23, 2010, 05:50 PM
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Originally Posted by MicRX
I wish I could but the barbs are literally cut off and welded shut, could I cap both lines?
You will have to disable your egr since you no longer have a vacuum source. Higher idle, you may need to have your BISS screw adjusted.
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