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Unread 06-13-2013, 08:47 PM   #1
Cashcrazy
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Join Date: May 2013
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Help me solve this popping noise(Video link)

I have a noise that sounds kinda like popcorn popping in a kettle. Listen real close and you can hear it. It's much easier to hear in person. Does anyone know what this is and what I need to do to fix it? The link below is a recording I took.



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Unread 06-14-2013, 09:12 AM   #2
Destr0
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1994 YJ Wrangler 
 
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I hear it but can't place what it would be. Hopefully someone can help... Sounds almost like something is loose - check motor/trans mounts??
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Unread 06-14-2013, 09:17 AM   #3
denverd1
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sounds like you left a ratchet somewhere! Idk man. maybe thrust plate?
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Unread 06-14-2013, 11:14 AM   #4
Cashcrazy
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It's hard to hear to due phone recording. Try to tune out the fan noise and head noise clattering. You can hear it the best after the engine is reved and the RPM's are dropping back down. It's more like a muffled air pop vs a ratchet banging around.
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Unread 06-16-2013, 08:56 PM   #5
Cashcrazy
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I found the source of the noise. It is coming from a hose in the air cleaner. It has a suction and the noise stops when I block the airflow. Does anyone have an idea what's causing this?

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Unread 06-16-2013, 09:13 PM   #6
ROWA
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1994 YJ Wrangler 
 
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Vacuum...
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The best Engineering is no match against natural Stupidity.
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Unread 06-16-2013, 09:28 PM   #7
Cashcrazy
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Something is working right in this vacuum hose. It is making a slurping noise. I have no idea what could cause this.
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Unread 06-17-2013, 09:37 AM   #8
Cashcrazy
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After more research I have learned that this is part of the pulse air system. About the only thing not stock on the jeep is there is no cat converter. At some point a small pipe was welded to the exhaust. I assume this was part of the the cat system at some point. Does the pulse air system actually do its job missing the converter? This particular port connects to a hose that leads to the exhaust manifold that is connected to the intake. Any ideas on this? Plug it, leave it alone or??

I have been trying to get this thing running like a new jeep with all the factory components. Now I am asking myself, What were the AMC engineers thinking with their vacuum design??
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