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Old 07-01-2012, 01:08 PM   #1
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2012 Wrangler Sport Plastic engine cover?

Hi all. My 1st post for my NEW Jeep!
I've been told that the plastic engine cover, under the hood, is just a decoration and I should remove it to allow engine to run cooler. Is this
true?

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Old 07-01-2012, 01:26 PM   #2
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Quote:
Originally Posted by jolooote View Post
Hi all. My 1st post for my NEW Jeep!
I've been told that the plastic engine cover, under the hood, is just a decoration and I should remove it to allow engine to run cooler. Is this
true?
I TRULY DO NOT believe it matters either way???? That cover is irrelevant in my book

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Old 07-01-2012, 01:40 PM   #3
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It's their to reduce engine noise. I doubt taking it off is going to matter much other than make the engine noise a little louder.
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Old 07-01-2012, 03:36 PM   #4
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I agree. I think its mostly decorative imho. Shouldnt matter if its there or not.
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Old 07-01-2012, 03:40 PM   #5
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I'd leave it there if it came like that from the factory. It may not serve a purpose but you never know. I personally wouldn't tinker around with something attached to the engine.
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Old 07-01-2012, 04:07 PM   #6
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Went to an oil change place that had a couple of them in the back they forgot to put back on.
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Old 07-01-2012, 04:26 PM   #7
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Quote:
Originally Posted by tomthbomb
Went to an oil change place that had a couple of them in the back they forgot to put back on.
Too funny
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Old 07-01-2012, 08:51 PM   #8
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Old 07-01-2012, 09:47 PM   #9
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Look how much foam is under the cover. It's obviously for noise absorbtion. I'm thinking about throwing mine in the storage building. It has to also trap heat too.
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Old 07-01-2012, 09:55 PM   #10
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Old 07-01-2012, 10:07 PM   #11
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You all are talking about it "trapping heat"... Who's had a problem with their 3.6 over heating? I was driving Friday in 104* with the ac cranked completely to max and I didn't even have a slight over heating problem... Maybe it'd be different on the trail. I know my 3.8 ran Crazy Hot!! ...Never seen another engine that ran so hot, so consistently hot!!
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Old 07-01-2012, 10:25 PM   #12
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I have kept mine of for two week. I may notice some more engine drone when accelerating. Will put it back on and see if it makes a difference. I don't like any lous sounds.

Sometimes, my Jeep tends to go over half when climbing slowly on trails. The only thing that helps- turning the heat on. Then it becomes silly hot, of course.
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Old 07-01-2012, 10:44 PM   #13
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Sorry but almost nothing you had said made no sense.
What did you do for 2 weeks? Or is it you are going to do?
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Old 07-01-2012, 10:53 PM   #14
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Have kept my cover off for two weeks now.
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Old 07-01-2012, 11:31 PM   #15
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I'm tempted to leave mine off too. Past cars have had covers just like these ones and I always end up tossing them in the trash.
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Old 07-02-2012, 01:00 AM   #16
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Quote:
Originally Posted by Davidsjeep
You all are talking about it "trapping heat"... Who's had a problem with their 3.6 over heating? I was driving Friday in 104* with the ac cranked completely to max and I didn't even have a slight over heating problem... Maybe it'd be different on the trail. I know my 3.8 ran Crazy Hot!! ...Never seen another engine that ran so hot, so consistently hot!!
Lol. Our 12 runs a lot hotter than our 2010. About 20* in temperature just on the transmission
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Old 07-02-2012, 01:31 AM   #17
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Definitely leave it off. It's just there for looks and to make the engine a little quieter. But if you think about it, it's like throwing a giant blanket (so to speak) on top of a hot engine. (Similarly, people cover themselves with blankets to stay warm--anything you put over your body will keep body heat from escaping quickly--same with an engine cover). Any increased airflow you can get to the engine the better. I've seen engines heat soak especially if sitting or moving very slowly from small tight engine compartments. A cover on top of an engine in a small compartment with reduced airflow seems like a sure way to make the engine even hotter. Hotter engines = worse performance as the engine will automatically reduce timing with increased temperature. Anything you can do to make the engine cooler is better for the engine. Especially if you're climbing hills at 5mph with little to no airflow. For example, if you yourself were sitting in a hot enclosed Jeep in the desert with no air conditioning, wouldn't you get hotter if someone came and threw a cover over your head? Common sense.

I remember in the mid 2000's the Chrysler Sebring 2.7L had an engine sludge issue that destroyed tons of engines. I also remember that part of the fix for the problem per a Chrysler TSB was to remove the engine cover. Why? Less heat. Less heat = less chance of oil sludge.

The cover serves no purpose but for decoration and sound, at the expense of the engine running a little warmer. For Jeeps that are known to run a bit on the warm side when climbing, I'd say we want to do anythng we can to reduce underhood temperatures. And, don't forget the Pentastar engines tick/head replacement problem that shows itself quickly in alot of Wranglers (and other Chrysler vehicles, but not nearly to the extent as our Wranglers). It could very well be possible that the head failure is in some way exacerbated by heat (not saying that heat itself causes it), and being that Jeeps possibly run a bit warmer than other Chryslers, this theoretically could make the head failure occur quicker in a Jeep than say a Chrysler 300. No one knows for sure yet what makes the Pentastar head fail in the Jeep moreso than in other Chryslers, but it IS a possiblity that heat is a contributing factor, and removing the cover will indeed let the engine run just a bit cooler. Can't say really how much, but it sure can't hurt.

No cover for me.
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Old 07-02-2012, 02:20 AM   #18
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Having a feature that reduces engine noise is like taking a pill that makes everything you eat taste bland.
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Old 07-02-2012, 06:58 AM   #19
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Taking the engine cover off was one of the very first things I did with both of my new 2012's.
No need to keep on a engine cover that traps heat, especially right over the plastic intake plenum. Even if it only drops the engine temp a few degrees it's worth it.
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Old 07-03-2012, 05:16 AM   #20
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I'd take it off in the summer and put it back on when the weather gets cold.
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Old 07-03-2012, 06:49 AM   #21
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took mine off, after i installed my AFE POWER STAGE 2 INTAKE SYSTEM, sound is amazing, install was pretty easy. just need to make sure i stay out of any deep water. i keep my stock for when i get a snorkel setup.
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Old 07-03-2012, 07:50 AM   #22
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Go muscle car, ricer, car show on it...

painted engine cover - Google Search

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Old 07-03-2012, 07:54 AM   #23
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I wouldn't jump to the conclusion that it'll make it run cooler. Often times shrouds help direct air over critical components so they actually cool better.

Since the 3.6 runs so cool to begin with I'm leaving mine on.
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Old 05-11-2013, 06:26 PM   #24
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Engine Cover

I just noticed mine was missing. Might of happened during last oil change. Did not even notice...
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Old 05-13-2013, 06:58 AM   #25
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If your an off roader it's nothing more than a dust trap. Mine has been gone since 1st off road trip. On mall crawler jeep's leave it on it will never get dirty.
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Old 05-13-2013, 10:36 AM   #26
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Mine just makes my fellow 3.8 drivers jealous. Leaving it on.
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Old 05-28-2013, 10:45 PM   #27
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Now that we are discussing the engine cover. Are there any chemical engineers around here that can tell me the exact material the foam in the cover is? It seems to be the same as the foam between the body and the transmission (which i need because i did a body lift and need to cover the gap in the shifter hole so no hot air blows in like an industrial blower), but apparently, no local shop knows what it is, not even the dealership knows.

Can't find a part number either, and the engine cover seems to be the only one that has the same material under there.
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Old 05-25-2014, 07:04 PM   #28
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Hi Jeepers
Of those that dont want their engine cover I would like to have one. 2012 Wrangler and mine is missing and I dont know where/when it dissappeared. Most likely an oil change when I was traveling a few months ago...I am near Pensacola, Fl if anybody cares to shoot one this way. Of course will pay shipping and a cost (well, if it isnt more than most of sa new jeep....) thanks
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Old 05-25-2014, 09:03 PM   #29
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Quote:
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Hi Jeepers
Of those that dont want their engine cover I would like to have one. 2012 Wrangler and mine is missing and I dont know where/when it dissappeared. Most likely an oil change when I was traveling a few months ago...I am near Pensacola, Fl if anybody cares to shoot one this way. Of course will pay shipping and a cost (well, if it isnt more than most of sa new jeep....) thanks
pm sent...

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