BBK throttle body plenum issue - Mustang Evolution

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Old 03-18-2015, 02:57 PM   #1
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BBK throttle body plenum issue

Just installed a 73mm bbk throttle body plenum combo... Product itself looks great.. But after the install I started the car and there is a loud rushing air almost a leaking sound coming from the back side of the BBK by the firewall.. The idle is a little lopey and my rpms fluctuate a little but I know that I adjust by the screw by the throttle cable.. I'm concerned about the leaking air issue... All the vacuum lines are hooked up right and so are the hoses... any ideas? I can't pin point the leak but i know it's on the back side for sure which is where it's the loudest and seems to be coming from
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Old 03-18-2015, 03:01 PM   #2
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I'm not sure if it's something major or if it's okay to drive on it or what... But this is my daily so I need to fix it if it's detrimental to the car.. And it could also be that the throttle body is just that much better flowing and that's how it always sounds but idk because it's pretty loud
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Old 03-18-2015, 04:20 PM   #3
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I just re-watched the cj pony parts install video and it looks as if the sound im hearing is supposed to be there because I think I hear it in their video as well but I'm not sure
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Old 03-18-2015, 04:50 PM   #4
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The torque specs for plenum to manifold are 90 INCH pounds. Make sure to tighten them to that torque and to tighten in a star pattern like a tire would get tightened. Otherwise spray some carb cleaner around the plenum and see if idle changes. Then you may need to re tighten or change the o ring gasket.


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Old 03-18-2015, 04:57 PM   #5
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BBK throttle body plenum issue

It may be the egr valve not being tightened or leaking air be causing the funky idle and leak sound?
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Old 03-18-2015, 05:10 PM   #6
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Yes it can. It's a source for a leak isn't it?


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Old 03-18-2015, 05:30 PM   #7
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There's a pretty major vacuum leak, but one of the red vacuum lines that go into the plenum in this pic Click image for larger version

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ID:	177837 broke in half so I went to oriellys got a vacuum hose that just reconnects the line back together so I would assume since I did that it's no longer leaking there. But there is a noticeable leak by the egr valve.. But I didn't think the egr was really an idle vacuum spot since it just recirculates exhaust
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Old 03-18-2015, 05:37 PM   #8
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Tighten up the two bolts that connects the egr see if it goes away


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Old 03-18-2015, 06:05 PM   #9
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Fixed it! The egr gasket folded and created a gap.. Fixed the gasket and it was good but I broke on the the bolt heads off tightening it lol good thing I'm doing an egr delete lol
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Old 03-23-2015, 09:59 AM   #10
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Lol why not get the bbk 78mm which has the tb and plenum together
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Old 03-23-2015, 05:19 PM   #11
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My 73mm was together too? 78 is way to big for a naturally aspirated car
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