BAC valve question
#1
BAC valve question
i have an s5 with a weird idle problem, after it warms up it sometimes stalls or gets close to it. i decided to check the BAC valve and it looks like its missing something. im going off the haynes manual with a picture, so im sure its the BAC valve located under intake tubing. i see the two coolant hoses, but no air hose. does that connect to anything? can anyone show a picture of where it connects to if it does? thanks.
#2
Top Down, Boost Up
iTrader: (7)
You need to post information about your car. If you have an S4 NA, the BAC valve is located on the back side of the plenum, in plain sight. Its air source is a metal hardline that is attached nearby. The hardline connects to a rubber hose on the black plastic intake tube.
#4
Top Down, Boost Up
iTrader: (7)
Your profile says "s4 rx7."
On an S5 NA, the BAC valve is underneath the plastic intake duct, and also connects to a hardline near the throttle body. It will be obvious if the air inlet is not connected and open to the air. If it is open for some reason, it will be sucking in unfiltered air, and you may have a big vacuum leak where it is supposed to connect.
On an S5 NA, the BAC valve is underneath the plastic intake duct, and also connects to a hardline near the throttle body. It will be obvious if the air inlet is not connected and open to the air. If it is open for some reason, it will be sucking in unfiltered air, and you may have a big vacuum leak where it is supposed to connect.
#7
Rotary Freak
I don't own a series five non turbo, but the FSM seems to show the air nipple on the BAC connects to one of the TWO nipples on the intake duct that attaches to the throttle body. See jpgs.
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#17
Rotary Freak
H1's computer died a quick death.
H1 got a new used computer.
H1 forgot his RX password.
H1's originally logged in using AOL (mistakes will be made in life).
H1 has ATT.NET and hiiiii spppppeeed internet. The girls in the porno sites move faster now ...humor
When H1 askes for his password to be sent to him.......it goes to a non functional AOL site I guess. RX site only recognizes H2.
It matters not. I lost count of posts sometime ago. It's not worth the trouble to get H1's password back.
#18
Cake or Death?
iTrader: (2)
Functionally they're going to be the same but it will be more difficult to route the hose.
The S4's electrical connector is also different, both in shape and location.
All in all, it's much simpler to just use the correct part.
#24
rotorhead
iTrader: (3)
nah i don't have a filter on it. i couldn't find one at autozone that fit on there easily, and i'm feeling kind of lazy about fabbing something. I may figure something out later, but right now i'm not that worried about it. A lot of cars with bigger turbos don't even run a filter on their turbo inlet. Besides, the BAC doesn't even open unless you are idling or decelerating.
Last edited by arghx; 07-23-09 at 07:37 PM. Reason: it's not like I'm idling in any sandstorms