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Old 07-13-2015, 10:56 AM
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2015 JKU Burning smell while accelerating fast

Recently I've noticed when I accelerate fast that my jeep makes this burning odor. It kind of smells like burnt rubber but I don't think it's the tires because even just accelerating to get on the highway produces an odor. I can smell it with the windows up but it gets a lot worse when they're down. Any suggestions as to what this might be?

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Old 07-13-2015, 11:11 AM   #2
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I believe that's normal. Mine and many others do it also. It's mostly noticeable when I have the back window out. I think it has something to do with how the computer advances the timing when you floor it.

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Old 07-13-2015, 11:12 AM   #3
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Old 07-13-2015, 12:42 PM   #4
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Mine does this as well. I think it might be the coolant fumes. That's what it smells like to me.
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Old 07-13-2015, 02:58 PM   #5
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Could be your plug wires, I use some shielding around mine, stopped the burning smell. The manifolds were getting really hot and causing the plug wires to give off the odor. You might also have an exhaust leak, any good muffler place can do a smoke test, you might have that done, you don't want to be breathing in fumes right out of the engine.
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Old 07-13-2015, 03:38 PM   #6
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They are not meant to accelerate fast. Just drive it, you have a warranty.
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Old 07-13-2015, 03:41 PM   #7
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Could be your plug wires, I use some shielding around mine, stopped the burning smell. The manifolds were getting really hot and causing the plug wires to give off the odor.
plug wires? We dont got no stinking plug wires on the pentastar!
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Old 07-13-2015, 03:50 PM   #8
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Its normal, just breaking the car in !
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Old 07-13-2015, 04:00 PM   #9
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It takes a few hundred miles for everything to break in. If after that you still have a bad odor then take it in under warranty and have it looked at.
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Old 07-13-2015, 04:03 PM   #10
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plug wires? We dont got no stinking plug wires on the pentastar!
Creepy, you made me google it, I have the 3.8L, here's a pick of where the spark plugs are on the pentastar, there must be wires in there but agreed, it ain't the problem ...



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Old 07-13-2015, 04:12 PM   #11
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Creepy, you made me google it, I have the 3.8L, here's a pick of where the spark plugs are on the pentastar, there must be wires in there but agreed, it ain't the problem ...



The plug is directly under the pack with a short "tower" that plugs right into the plug. No wires in the conventional sense.

Starting around step 6 there are some good pictures of the coil plug.

3.6L Pentastar Spark Plug Step-by-Step Guide (with pics) | DS Jeeps
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Old 07-13-2015, 04:14 PM   #12
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I noticed this too on mine, actually my wife did first (shhh) top was down at the time. I blamed the truck in front of us....now it's got me thinking.

I'm at almost 3k miles now so it should be broken in by now.
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Old 07-13-2015, 04:30 PM   #13
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I'm at 6000 miles and mine still does it. As a matter of fact the AC gets noticeably warmer for about 30 seconds after stepping on the gas hard to pass at freeway speeds. Then I get the burning smell.
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Old 07-13-2015, 09:03 PM   #14
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I get the same smell on my 2015 JKUS, odd
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Old 07-13-2015, 09:42 PM   #15
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I've had the same burning smell since I bought my '13 at 14,500 miles. At first I thought it was bad gas left over from sitting on the car lot. I have 20,000 now & it's still there, EVERY time I get above 1/2 throttle, it smells like a bad catalytic convertor to me but no codes. Had it to 2 different dealers & they can't duplicate it. I can make it happen every time, problem is, I can never take a ride with a tech because I drop it off at nite & pick it up after the techs leave for the day. If it's normal, it shouldn't be, no other car I drive does it.
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Old 07-19-2015, 10:39 AM   #16
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Ya mine does it as well. I've only just recently noticed it, as I'm running 315's on 4.10 gears now so headed up passes I get up to 4k RPMs. The first couple of times I thought it was another vehicle. I agree it should not smell like that at any time...
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Old 07-20-2015, 12:27 AM   #17
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My 2014 does this, too- I've got about 5k miles on it. It's under warranty, so I guess I'll wait for it to throw a code...
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Old 07-27-2015, 08:33 AM   #18
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Me and my wife have 2012 Saharas and we both get the burnt smell under heavy acceleration. Mines a 4 door, hers a 2 door. I thought maybe it was something they eventually fixed being that the Pentastar started in 2012, but apparently not from what I'm reading. We are both between 30,000 and 40,000 KMs. (20,000 miles or so)
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Old 09-30-2015, 12:03 AM   #19
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My 2014 Wrangler just developed this burning rubber smell at higher speeds. The AC warming up a little at the same time is the clue. The AC clutch has a rubber hub to absorb vibration just like a harmonic balancer. After marking the inner and outer hubs with a paint line I drove the jeep at highway speed for a few minutes.
After reinspecting the AC clutch I found the inner and outer hubs were no longer clocked in the same position confirming that the inner or outer hub is slipping on the rubber causing the burning smell. I'll see what the warranty department at my friendly Jeep dealership has to say.
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Old 09-30-2015, 08:57 AM   #20
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The AC warming up a little at the same time is the clue.
Many cars automatically disengage the AC clutch when the throttle position reaches a certain point. So, the AC blowing warmer during spirited acceleration may be normal. I'm not sure if the Jeep is set up that way or not. Just a FYI.
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Old 09-30-2015, 08:58 AM   #21
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My 2015 JKR does it too. I would assume the AC compressor might get shut off at wide open throttle. The slipping hub idea sounds like it might have merit. I have no idea how the clutch and "hub" on the front of the AC compressor works on a chrysler, though.
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Old 09-30-2015, 09:34 AM   #22
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My 2015 does it as well. I also own a RAM Promaster work van that also sports the Pentastar - it has 26,500 miles on it and it still does it the few times that I hammer it.
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Old 09-30-2015, 10:29 AM   #23
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Many cars automatically disengage the AC clutch when the throttle position reaches a certain point. So, the AC blowing warmer during spirited acceleration may be normal. I'm not sure if the Jeep is set up that way or not. Just a FYI.
You're correct. Under a full acceleration the compressor shuts down.
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Old 10-01-2015, 07:49 AM   #24
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Im not talking about the normal WOT disengagement of the AC clutch or the normal cycling that occurs during AC use. If you look at the front of the AC clutch you will see an inner metal hub, a rubber ring and an outer metal hub. The rubber is used as a shock absorber when the clutch engages during normal operation. What I found in my case is the inner hub is slipping in the rubber causing a light burning smell. This is probably caused by hi head pressures in the AC compressor which could be caused by improper condenser cooling or over charging of the system. I'll post a picture as soon as I get a chance.
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Old 10-01-2015, 08:17 AM   #25
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I believe what you're smelling is simply hydrogen sulfate/sulfide that is not absorbed by the catalytic converter.

When you go WOT, most engines go extremely rich (like 10 AFR, or air to fuel ratio, or richer) in order to keep the cylinder temps in check. The catalytic converter is made to scrub most harmful emissions at stoic, that is 14.7 AFR, which is where most people spend most of their time at when driving. It's not up to the task of absorbing excess sulfur from the fumes created from combustion when running rich, however. And gas has a pretty high sulfur content.

What it's often described as is the "rotten egg smell" or the "burning smell". It's pretty normal for most cars, although it especially noticeable in the Wrangler when the windows are out. This is because all cars have a low pressure zone at the rear, including the Wrangler, and the exhaust gases that normally get swept up the back of the vehicle (which is why the rear of the car always gets super dirty before the rest does) actually get swept into the cabin on a Wrangler without windows.

AFAIK, most cars do this. Some manufacturers put better or more cats on their vehicles that scrub out the sulfur, some just tune for a higher AFR at WOT.
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Old 10-01-2015, 08:21 AM   #26
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Old 10-02-2015, 06:24 PM   #27
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It is just the cat breaking in. less strong smell the more miles you put on it.
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Old 10-03-2015, 08:39 PM   #28
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I'm at 6000 miles and mine still does it. As a matter of fact the AC gets noticeably warmer for about 30 seconds after stepping on the gas hard to pass at freeway speeds. Then I get the burning smell.
the PCM cuts power to the ac compressor under WOT
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Old 10-25-2015, 11:10 AM   #29
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It is just the cat breaking in. less strong smell the more miles you put on it.
I wholeheartedly disagree. Mine started around 55k miles, and continues to smell under hard acceleration at 72k.

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