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NOTE: I am not a mechanic/technician nor do I plan to be. Do this at your own risk.
Update: Do not place the manifold gasket upside down, this will cause idling problems.
Alright, 3rd Gen 2.5l Altima and other QR owners, this video is for you. If you have a QR25DE, this is a MUST. Check your power valve (butterfly) screws, as overtime they can come loose and get sucked into your engine and cause internal damage. This is serious! So here's a video for you to get inside the intake and Loctite them down.
Here are two great write-up sites I learned from:
Nissanclub.com: www.nissanclub....
B15sentra.net: www.b15sentra.n...
This procedure took me four hours to do, with all the filming and holding the camera. It shouldn't take an average Joe no longer than 2 hours to do. It's so easy a gal like me can do it.
Clean everything with brake clean and when you screw in the screws, use Loctite or some other red threadlocker to keep them down.
If you have a question, drop it in the comments section below. Good luck on the intake :)!
Again, BT on NissanClub, THANK YOU for the awesome write-up!
All actions performed on my 2003 Nissan Altima 2.5S with convenience package.