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Old 09-17-2011, 04:22 PM   #1
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2012 Exhaust Sounds & Smells Issues

So Ive now got about 1000 miles on the new JK and I'm wondering if what Im experiencing is consistent with what others are hearing and smelling with thier JK's.

First issue is Exhaust Fumes. With the soft-top on, and side & rear window off, when I accelerate hard, or go up prolonged hills on the road I get a reasonably strong smell of exhaust fumes in the Jeep. It fades as I reduce the load on the engine (ie. get up to speed or crest over hills). I get the same effect with the top completely off.. Ive found that rolling the windows down to get fresh air moving reduces the smell..
Im sure its Exhaust gas getting pulled back up into the passanger compartment from the backdraft at the rear of the Jeep.. Is this a common phenomenon? CO gas is nothing to mess around with, so I'd like to limit the amount Im ingesting if possible.

Issue #2. This one may be harder to explain. But basically when accelerating from a stop as the RPM's goes from 2500-3000 in 1st gear the exhaust sound changes from a typical note, to a tinny rattling drone. It does it mostly in first gear, and sometimes in second as you are rapidly increasing the RPM's and accelerating. It almost sounds like something is resonating, rattling or loose in the muffler. Lower than 2500 rpm or above 3000 it doesnt make the noise. My guess is its something to do with the amount of air & the velocity it is getting pushed thru the muffler..

Anyone else with 2012's experiencing this noise?

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Old 09-17-2011, 04:36 PM   #2
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Dont know much about the 3.6, but I love my exhaust on my 3.8 the fumes are probably because the back window is out and as air curves over the top, it is drawing in exhaust fumes. You can not smell CO, but it's a pretty safe bet that if you can smell exhaust, you are being exposed to CO. CO is bad, but honestly as long as you are moving air in the vehicle it is probably not a big issue. The sound could be a loose fitting on the clamps along the exhaust route. You can smell the exhaust more with the back open because its coming in through the open back. Again, I wouldn't lose sleep over it.

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Old 09-17-2011, 04:36 PM   #3
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Everything sounds normal in mine when accelerating, nothing out of the ordinary...might just be the exhaust tune.

Not really sure about the exhaust fumes when the soft top is down, I haven't experienced that myself, or at least noticed it.
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Old 09-17-2011, 04:45 PM   #4
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I have experienced both conditions. I thought the smell was something burning off as part of the break-in, but I am at 900 miles now. Nothing which makes me sick, but noticeable on hard acceleration. As for the high pitched rattling, I was going to have checked during my free dealer oil change. (Already did one myself).
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Old 09-17-2011, 05:23 PM   #5
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The last time I was in the Jeep it had around 500 miles on it. Not sure how many it has now, but the exhaust note has changed noticably since we got it. I haven't noticed any smells.
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Old 09-17-2011, 09:05 PM   #6
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Originally Posted by theotis View Post
I have experienced both conditions. I thought the smell was something burning off as part of the break-in, but I am at 900 miles now. Nothing which makes me sick, but noticeable on hard acceleration. As for the high pitched rattling, I was going to have checked during my free dealer oil change. (Already did one myself).
Its not the break in burn smell.. I had that too. Its exhaust fumes..

I may toss a CO sensor in the back the next time i have the sides off (may be a while im in WA state) Just to be safe and see if there are any registering CO levels.
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Old 09-18-2011, 12:19 AM   #7
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Y'all and your Carbon Monoxide. As long as you aren't having any difficulty breathing, inability to catch your breath or anything like that you are fine! If you turn cherry-red from the nipple line up, well its a bit late and just enjoy the rest of your drive and call your loved ones and enemies to make your peace.
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Old 09-18-2011, 02:16 PM   #8
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I haven't noticed any funny smells at about 1400 miles today. Did an oil change, so fired it up to warm up the engine, and opened up the back to get all my stuff out for the oil change. Once I was done, I fired it up again, and again was in the back putting everything back up and checking for any drips. Never noticed any odd sounds or smells.

Now, after a good mexican dinner I may experience some 1974 sound and smell issues. But so far nothing with my Jeep.
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Old 09-19-2011, 10:12 AM   #9
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Quote:
Originally Posted by Chasin Tail View Post
Its not the break in burn smell.. I had that too. Its exhaust fumes..

I may toss a CO sensor in the back the next time i have the sides off (may be a while im in WA state) Just to be safe and see if there are any registering CO levels.
The owners manual has a warning in it that says that you are not supposed to have the back windows open while driving because exhaust can enter the passenger area. Unless you have all of your windows open to keep the air circulating, you can get an exhaust smell.
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Old 09-19-2011, 10:33 AM   #10
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I would imagine the VVT has something to do with the change in exhaust tone. All variable vale timing engines do it to some extent.

The smell from accelerating hard is normal, and can even happen in a fully sealed car with a fixed roof. The Wrangler will be more prone to it because of it's shape and soft top. What are you smelling, exactly? Burnt fuel (kind of a smoky smell, have someone rev your jeep and stand behind it, pretty normal when you any engine hard), unbunt fuel (will smell like gas, possible 02 pr exhaust leak issue), rotten eggs (sulfur from the catalytic convertor, also somewhat normal, especially if you don't run it hard much).
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Old 09-19-2011, 06:24 PM   #11
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I had the WOT stink for about the first 1,000 miles. I started to do WOT's at about 500 miles and it was really bad. There are so many components that you are super heating and this is what causes the smell. I spoke to a Shop Foreman at my Dealer and this was his opinion. My Jeep has about 1500 miles on it now and the smell is virtually gone. Full top and windows were up most of the WOT's with the smell happening.
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Old 09-19-2011, 07:52 PM   #12
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Issue #2. This one may be harder to explain. But basically when accelerating from a stop as the RPM's goes from 2500-3000 in 1st gear the exhaust sound changes from a typical note, to a tinny rattling drone. It does it mostly in first gear, and sometimes in second as you are rapidly increasing the RPM's and accelerating. It almost sounds like something is resonating, rattling or loose in the muffler. Lower than 2500 rpm or above 3000 it doesnt make the noise. My guess is its something to do with the amount of air & the velocity it is getting pushed thru the muffler..

Anyone else with 2012's experiencing this noise?[/QUOTE]
I am having similar noises with my 2011.. I am taking mine in next week because it is getting louder and louder. I feel like it is coming from the rear as well. My the controls on my steering wheel went out also. I have read about 2010 & 2011 recalls.. starting to wonder if mine has been recalled...
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Old 11-15-2011, 05:41 PM   #13
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I have that nasty exhaust smell. Started @ 800 miles and is still hanging on @ 1200. At first I thought it was a clutch smell, something hanging up. I've been driving vehicles w/clutches (2 and 4 wheel alike) for 25 years and never had this problem. Hope it goes away.
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Old 11-15-2011, 06:40 PM   #14
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Quote:
Originally Posted by Chasin Tail View Post
So Ive now got about 1000 miles on the new JK and I'm wondering if what Im experiencing is consistent with what others are hearing and smelling with thier JK's.

First issue is Exhaust Fumes. With the soft-top on, and side & rear window off, when I accelerate hard, or go up prolonged hills on the road I get a reasonably strong smell of exhaust fumes in the Jeep. It fades as I reduce the load on the engine (ie. get up to speed or crest over hills). I get the same effect with the top completely off.. Ive found that rolling the windows down to get fresh air moving reduces the smell..
Im sure its Exhaust gas getting pulled back up into the passanger compartment from the backdraft at the rear of the Jeep.. Is this a common phenomenon? CO gas is nothing to mess around with, so I'd like to limit the amount Im ingesting if possible.

Issue #2. This one may be harder to explain. But basically when accelerating from a stop as the RPM's goes from 2500-3000 in 1st gear the exhaust sound changes from a typical note, to a tinny rattling drone. It does it mostly in first gear, and sometimes in second as you are rapidly increasing the RPM's and accelerating. It almost sounds like something is resonating, rattling or loose in the muffler. Lower than 2500 rpm or above 3000 it doesnt make the noise. My guess is its something to do with the amount of air & the velocity it is getting pushed thru the muffler..

Anyone else with 2012's experiencing this noise?
I have a 2011 Unlimited Sahara and had rattling noised at about 1,500 miles. Went to the dealer, they took the engine apart and basically told me something was loose in the engine. Now at 12,500 miles it has started again but only when I accelerate up hill. Have to bring it back.. I really miss my reliable past wranglers...
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Old 11-16-2011, 12:55 AM   #15
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Oh my yes you are going to smell exhaust fumes when cruising with the back wind up/open. I had a blazer that would stink you to high heaven with the back window open. It was horrible. But if you took the Top completely off it was fine. It has to do with how air flows. Air is drawn right into the cabin when the back glass is down because a vacuum is created which pulls the air into the passenger compartment.
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Old 03-17-2012, 04:55 PM   #16
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Im experiencing the same exhaust sound with my 2012 sahara. I didnt notice it at first but recently its been really nice out so my windows have been down and when I have the radio off I hear a slight rattle or drone noise when accelerating at lower rpms. When im idles and rev the engine I hear nothing. did you ever figure out what the problem was with yours or has anyone else had this or is this just normal.
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Old 03-17-2012, 04:57 PM   #17
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everything is ordinary. same thing happens to me. these brand new engines are still breaking in is what I am assuming. also, if you ever get a cat-less exhaust, it's consistently terrible smelling ALL the time but sounds sweet.
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Old 08-27-2012, 03:39 PM   #18
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Has anyone ever gotten resolution on this smell issue? My 2012 has just under 5,000 miles on it and it stinks under hard acceleration and when going up hills at highway speed - basicially, any time you push the engine a bit. I've noticed it with the hard top on, soft top on, no top. I too originally thought it was a clutch issue but it smells more like exhaust. I've got an appointment to get this issue along with my creaky driver seat bottom cushion looked at this week.
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Old 08-28-2012, 01:22 AM   #19
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I have an 2012 also, if you are really working the engine hard for any length of time the exhaust stinks to high heaven. I believe it is the catalyst system that is causing the odor. I think the engine is set up to run so lean that it causes a tremendous amount of heat to build up in the catalytic converter thereby causing the smell when the engine is placed under a moderately heavy load for any length of time.
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Old 08-28-2012, 07:28 AM   #20
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I get the smell too at high throttle openings, like going up hills. If it's a normal characteristic I can live with it. One thought bothers me - the idea that it might be related to the head failure issue. If an exhaust valve doesn't hold tight it would be most evident when the motor was under load and maybe that makes a smell.
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Old 10-19-2012, 04:49 PM   #21
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This is for Chasin Tail and the end to El Gringo, to a lesser extent: I have a '99 Wrangler so it's a good deal older than the jeep in question. However I had the exact issue as was described above--exhaust smell in the cabin when under load and a rattling sound from front left side of the engine compartment at higheer RPM's. It turns out there was a design flaw in at least the '99s and if they can screw it up once, there's reason to believe they can screw it up again. When the rattling sound got worse I took in. It turns out the exhaust manifold was broken into 2 pieces. 4 of the 6 pipes coming off the engine were broken with cracks over 1.5" long and over 1/2" wide. Two of those were broken off completely and draining 100% of their exhaust into the engine compartment. Now that it's replaced, cabin noise is 1/4 what it had been and gas mileage has gone up noticeably. Definitely check for recalls. I'm going to do some research on mine and that doesn't work and if I get nowhere then I have the direct number for the Director of Quality Management at the Jeep factory...somewhere in 13 years worth of Jeep paperwork. He called me personally and gave me his direct line.

As for the CO being a non issue--bad advice. CO exposure can cause headaches that last for hours. Once a blood cell picks up CO it can never let it go. So the problem gets worse over time. And you be unconcious long before you turn cherry pink from the nipples up. The stuff is nothing to mess around with.
Hope this helps.
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Old 10-25-2012, 04:34 PM   #22
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Originally Posted by jaswalt
This is for Chasin Tail and the end to El Gringo, to a lesser extent: I have a '99 Wrangler so it's a good deal older than the jeep in question. However I had the exact issue as was described above--exhaust smell in the cabin when under load and a rattling sound from front left side of the engine compartment at higheer RPM's. It turns out there was a design flaw in at least the '99s and if they can screw it up once, there's reason to believe they can screw it up again. When the rattling sound got worse I took in. It turns out the exhaust manifold was broken into 2 pieces. 4 of the 6 pipes coming off the engine were broken with cracks over 1.5" long and over 1/2" wide. Two of those were broken off completely and draining 100% of their exhaust into the engine compartment. Now that it's replaced, cabin noise is 1/4 what it had been and gas mileage has gone up noticeably. Definitely check for recalls. I'm going to do some research on mine and that doesn't work and if I get nowhere then I have the direct number for the Director of Quality Management at the Jeep factory...somewhere in 13 years worth of Jeep paperwork. He called me personally and gave me his direct line.

As for the CO being a non issue--bad advice. CO exposure can cause headaches that last for hours. Once a blood cell picks up CO it can never let it go. So the problem gets worse over time. And you be unconcious long before you turn cherry pink from the nipples up. The stuff is nothing to mess around with.
Hope this helps.
Yes CO certainly is an issue, but unless you pipe your exhaust inside your vehicle its nothing to worry about. Turning red would be an ominous, near-terminal indication of CO poisoning. Hemoglobin definitely does release CO molecules after a certain period, they aren't permanently bonded, by the do have an affinity for each other. I'll take my chances with windows down on the freeway.
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Old 04-09-2013, 07:11 AM   #23
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Fuel smell under acceleration up hill

Good day all,
I have a 2010 "Mountain" 3.8 with 40 000kms and under acceleration up I get a strong fuel smell. ?? I've stopped to check but no leaks. This is with the roof on ,windows closed. It happens above 3500 rpm. Any ideas?
Thanks.
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Old 04-09-2013, 07:18 AM   #24
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Sorry, left out " up a hill".

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