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Unread 04-30-2013, 08:58 PM   #1
akm446
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Air Box Tubes and Holes?

I opened my air box today and looked in to find a broken tube and two holes, one being the other end of the broken tube. Can anyone tell me what's supposed to be connected to which holes? Everything on the outside of the air box looks good. Could this be the reason why I'm losing power at around 65 MPH randomly for a second or two? I have an 87 YJ with a 2.5 Liter in it.

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Unread 04-30-2013, 09:10 PM   #2
Louie4
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I'm not sure what those holes are there for but they shouldn't have that much of an impact on the engine, especially since they are in the bottom box before the filter.

Not sure about your issue at 65mph.
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Unread 04-30-2013, 09:20 PM   #3
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Quote:
Originally Posted by Louie4
I'm not sure what those holes are there for but they shouldn't have that much of an impact on the engine, especially since they are in the bottom box before the filter.

Not sure about your issue at 65mph.
That tube makes a flap open so more air can get in I think. And the broken end of the tube is connected to some sensor (I think) on the carb cover.
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Unread 05-01-2013, 06:57 PM   #4
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I vaguely recall this setup on my mom's 1986 Cherokee with the 2.5L. I think I just capped the vacuum hoses to the flap mainly because that was a POS Cherokee and it cost $500.

Does the flap work when vacuum is applied?
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Unread 05-01-2013, 08:14 PM   #5
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Quote:
Originally Posted by akm446
Could this be the reason why I'm losing power at around 65 MPH randomly for a second or two? I have an 87 YJ with a 2.5 Liter in it.
2.5L nah, I'm just kidding. Does it happen at the exact same time every time? Or does it vary from when it's hot or cold etc?

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Unread 05-01-2013, 08:18 PM   #6
akm446
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Quote:
Originally Posted by Louie4
I vaguely recall this setup on my mom's 1986 Cherokee with the 2.5L. I think I just capped the vacuum hoses to the flap mainly because that was a POS Cherokee and it cost $500.

Does the flap work when vacuum is applied?
Here's what I just did. I went to autozone and bought the closet sized hose I could find. And fitted it to where I think the old tube went. Then I sealed it off because the tube was a little smaller than the old one which fit tightly through it.
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Unread 05-04-2013, 09:50 AM   #7
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Good deal. Does the flap operate properly?
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Unread 05-04-2013, 10:45 AM   #8
akm446
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Quote:
Originally Posted by Louie4
Good deal. Does the flap operate properly?
I'm not sure exactly how it works. I figured it would open while driving. How can I find out if it's working or not?
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Unread 05-04-2013, 02:26 PM   #9
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Quote:
Originally Posted by akm446 View Post
I'm not sure exactly how it works. I figured it would open while driving. How can I find out if it's working or not?
Put a vacuum on the end of that tube and see if it moves. This may sound gross but I have just used used my mouth. I did that when I tested my 4wd shift motor.
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Unread 05-04-2013, 02:59 PM   #10
akm446
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Quote:
Originally Posted by Louie4

Put a vacuum on the end of that tube and see if it moves. This may sound gross but I have just used used my mouth. I did that when I tested my 4wd shift motor.
It works! I just used my mouth. Haha.
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Unread 05-04-2013, 03:14 PM   #11
Louie4
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Quote:
Originally Posted by akm446 View Post
It works! I just used my mouth. Haha.
I'd say you're good to go.
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Unread 05-04-2013, 03:15 PM   #12
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Quote:
Originally Posted by Louie4

I'd say you're good to go.
Sweet thanks!
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