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whats this called

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Old 10-22-10, 07:36 AM
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Angry whats this called

Not sure what its called?
But the screw is missing where can i get a new one or how do i fix it?
Attached Thumbnails whats this called-photo-0015.jpg  
Old 10-22-10, 12:59 PM
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needs more track time

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A clearer pic would be helpful. Also, what model rx7?
Old 10-22-10, 01:04 PM
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It is the Bypass Air Control valve also know as the "BAC."
Old 10-22-10, 05:33 PM
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what "screw" is missing?
Old 10-22-10, 06:00 PM
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If the component is for a turbo then there should be an adjustment screw in the tube sticking outwards from the engine. If it's for a non turbo then there is no adjustment screw.
Old 10-22-10, 06:03 PM
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W = FD

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Originally Posted by Schicawhat
But the screw is missing where can i get a new one or how do i fix it?
Are you trying to say this screw is missing?

Old 10-22-10, 06:59 PM
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yes sir thats it and its a 87 turbo 2 s4 with s5 manifold and that screw is gone.

I looked in the hole looks like it was broken in there....
i think it might be the last part to why my car idles a little funny.

Last edited by Schicawhat; 10-22-10 at 07:05 PM.
Old 10-23-10, 01:04 AM
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Where can I get one for a turbo or is there a way to fix it?
Old 10-23-10, 10:18 AM
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Engine, Not Motor

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If the screw is missing, then putting your finger over the hole while the engine is running will allow you to feel vacuum. If there is no vacuum present, then don't worry about it.
Old 10-23-10, 03:07 PM
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Okay I'll try that, the thing is tho I timed it fixed the tps, throttle cable
and when I first start it up it idles great but after a min it starts to jump up and down

I have a clogged catylac converter and some of the hoses are a little old
other than that everything is in working order so I'm not sure I thought it would be the bac
since missing the screw...

Thank you for the help anything else is awesome.
Old 10-23-10, 05:24 PM
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The car needs to be thoroughly warmed up before the TPS is to be adjusted in case you did not know that.
Old 10-23-10, 07:06 PM
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Yea it was done at a shop and they are the ones who said it was the bac due to the screw being missing or stripped and broken.
Old 10-25-10, 02:42 AM
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Put my hand over it and nothing what could be the cause of a wierd jumps then
it idles okay for a min then ifi push the gas a little it jumps upand down.

from 750ish to 1300
Old 10-25-10, 10:02 AM
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Engine, Not Motor

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Test and adjust your TPS. Check for vacuum leaks.
Old 10-25-10, 02:31 PM
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Where would i start looking for a vac leak if its not the tps, would it be a boost or a leak somewhere else?

also to make it a little clearer sorry i was on my ipod when i posted last.

It idles around 750ish then when i push the gas to rev up or just to go when i let go it starts to do the jump but when im on the gas actually moving it runs great its just when i let go.

Also was wondering if since the screw is stripped in the BAC or missing should i just take this opportunity to get a new intake manifiold?

If so is there a kit with a BAC and intake manifold?
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