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Old 03-24-2014, 01:40 PM   #1
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Removed front air dam, then....

Took off the front plastic ar dam and replaced it with a solid skid plate. Ever since, there has been this awful noise from under the hood.
At first, I though it was hood flutter. Didn't see the hood moving, but I took the spring out as some users mentioned. Still there. It's new, so I dont think the hood latches are bad, but this is my first Jeep so...
Is sounds to me like its coming from under the hood, in the dash...is a constant vibrating drone at 50 or so. Drives me nuts. I am about to put the factory air dam back on.
Anyone else have a simlar noise after replacing the air dam?
I have 2.5" lift on it...I am sure that adds to the issue, but again, it wasn't there before.

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Old 03-24-2014, 02:01 PM   #2
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It could be the way the air is flowing around the new skid and making a howl

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Old 03-24-2014, 02:25 PM   #3
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it's a definate vibration / shudder. I almost feel like something eventually just may vibrate loose.
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Old 03-24-2014, 02:31 PM   #4
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Take the skid plate out. Dont put anything back, drive it for a while, check if you hear anything.
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Old 03-24-2014, 02:50 PM   #5
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over the years I have a rubber mallet benificial in locating loose nuts and bolts. bop the front skid plate and listen..
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Old 03-24-2014, 03:01 PM   #6
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over the years I have a rubber mallet benificial in locating loose nuts and bolts. bop the front skid plate and listen..
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Old 03-24-2014, 03:07 PM   #7
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The Air Dam is designed to create a low pressure zone behind the engine.

The Air Dam, has a twofold purpose to help with fuel economy, and create a venturi effect that will help to pull air through the radiator, and will improve cooling system efficiency! If you don't live in a hot climate, then you probably won't notice any difference in your cooling system.

When you remove it, the air flow characteristic have been change from it's original design. More air is now forced up under the hood, which effects your cooling system, and will add to the hood flutter that some have. I'm sure that other noises/vibrations like yours has, may also be created from the force of the air flow.

Really, about all that you can do, is look for something that is loose, and or vibrating!
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Old 03-24-2014, 03:29 PM   #8
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The Air Dam is designed to create a low pressure zone behind the engine.

The Air Dam, has a twofold purpose to help with fuel economy, and create a venturi effect that will help to pull air through the radiator, and will improve cooling system efficiency! If you don't live in a hot climate, then you probably won't notice any difference in your cooling system.

When you remove it, the air flow characteristic have been change from it's original design. More air is now forced up under the hood, which effects your cooling system, and will add to the hood flutter that some have. I'm sure that other noises/vibrations like yours has, may also be created from the force of the air flow.

Really, about all that you can do, is look for something that is loose, and or vibrating!

These are some interesting talking points. Do you think that the adverse effects are minute or can be relatively significant?
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Old 03-24-2014, 03:48 PM   #9
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^^^I have not pulled the AD off of mine, because I live in Phoenix, where we need all of the cooling system that we can get.

I have heard from others on the Forum stating, that their cooling systems do run somewhat hotter in mid summers, and others have said that theirs do not! I'm guessing that their logistics is playing a major role in this!
I am not going to take the chance, because we have ambient temps here mid-summer of 115, plus!
I use to work with a paving crew, and we would shoot the asphalt temperatures with a infra-red heat gun, and have seen temperatures of 165 degrees, radiating from the highway, in our mid-summers.

So when I install the RCs on mine, I am going to just trim the Air Dam, I hope that it will look O.K.

But, most on the Forum, have said that it does either create, or add to the hood flutter.
Many have then changed their hood latches to a solid types to eliminate the hood bounce!
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Old 03-25-2014, 07:54 PM   #10
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Pulled mine, no change in anything. 2012 JKU on 35's lifted 3.5"
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Old 03-26-2014, 08:19 AM   #11
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Any suggestion for a, not too expensive, good front plate I can install in place of my ''gone'' air dam that fits with the stock bumper ?
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Old 03-26-2014, 09:26 AM   #12
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mopar makes a great one for about $200
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Old 03-26-2014, 10:03 AM   #13
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Well...i took the skid plate off, left the air dam off and still got the vibration from behind the dash. Either I have to live with it or go back to the OEM air dam.
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Old 03-26-2014, 10:08 AM   #14
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Well...i took the skid plate off, left the air dam off and still got the vibration from behind the dash. Either I have to live with it or go back to the OEM air dam.
Your noise may not be related to the air damn, there have been several noises found like the heater pipes rubbing & the 4wd cable rubbing.
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Old 03-26-2014, 10:32 AM   #15
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Mine wasn't temp or RPM related. Mine was driving at speeds of 55+ (or lower if real windy). And it happened immediately after installing the skid plate. Putting the air dam back on Sunday when I can drive her again. If no vibration then, I know exactly what the cause is.
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Old 03-26-2014, 10:53 AM   #16
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The noise of Death

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This does work
I had this annoying loud metal to metal knock on my left front end and thought the car was falling apart. Even took it to the dealer asking them to inspect my front end and steering. Got mad one day and grabbed and shook. So I grabbed the Hood left side where the hinge was at and yanked real hard. Yep. That was it.
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Old 03-26-2014, 11:53 AM   #17
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Well...i took the skid plate off, left the air dam off and still got the vibration from behind the dash. Either I have to live with it or go back to the OEM air dam.
Put the OEM air dam back on and see if the noise persists. You may simply have another issue and it's coincidental that it appeared when you put the skid plate on.
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Old 03-26-2014, 01:59 PM   #18
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Mine wasn't temp or RPM related. Mine was driving at speeds of 55+ (or lower if real windy). And it happened immediately after installing the skid plate. Putting the air dam back on Sunday when I can drive her again. If no vibration then, I know exactly what the cause is.
Issue is, many have pulled the plastic dam and have had no vibrations or noises ever. Its not a cause of 'removing' the dam, but something that was already, lets say loose, that is now making noises and vibrating.

Im also lifted at ~3" (net), not running with the stock dam or a skid plate, I get no howls, vibrations or noises, and many others are running naked under too. There is something else, in your setup, that is being affected by, possibly, the extra airflow or turbulence. But its not because of the dam itself not being there that you are getting noises. Or as Nuke83 mentioned, it can also be coincidental.

Its kind of like unbalanced tires and death wobble. Although the unbalancing triggers it, they are not the actual cause of the issue.

Surely, you may not feel like troubleshooting what the actual cause is and just want to put the dam back.
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Old 03-26-2014, 02:44 PM   #19
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Let us know what you find after putting the air dam back. To combat heat, I am seriously considering the AEV hood.
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Old 04-07-2014, 06:49 PM   #20
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Finally got around to removing the skid plate. I drove it for a few miles over 55mph without it...same thing. I put the airdam back on and the noise/vibration went away. Kind of a bummer. I think it is the drivers side cowl or something up in that area. When I get another day off, I will play around with tightening things up / troubleshooting as best I can. But...i figure since I only get time to go off road / wheelin a few times a year, it'll be easy to to just put it on before hand. Just 4 little ol' bolts.
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Old 04-07-2014, 07:13 PM   #21
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Finally got around to removing the skid plate. I drove it for a few miles over 55mph without it...same thing. I put the airdam back on and the noise/vibration went away. Kind of a bummer. I think it is the drivers side cowl or something up in that area. When I get another day off, I will play around with tightening things up / troubleshooting as best I can. But...i figure since I only get time to go off road / wheelin a few times a year, it'll be easy to to just put it on before hand. Just 4 little ol' bolts.
At least now, you know that the change in air flow, caused by, (Dam on, Dam off, and back on again), has influenced your issue. Negatively when off.

Since some of the Members have taken theirs off, and other than hood flutter, haven't heard any noise, that tells us that you have something loose, and or something fretting causing your noise.
These are tough to find some times. You may want to try the rubber mallet, that some of the other posts have suggested!

As for the AD, if Chrysler/Jeep didn't feel that it was needed, or served any purpose, then they wouldn't go to the expense of engineering it, manufacturing it, and then installing it...........
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Old 04-07-2014, 09:56 PM   #22
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Fwiw .. I used to get this whistle. Removing the air dam fixed it.

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