Rattling upon acceleration

[99mhz]

Hi everyone i'm glad I found this thread! I thought I was going crazy hearing that sound in a brand new Jeep. Mine has done it since new 2018 JL manual. I thought for a long time it was just me getting used the the manual again and lugging it a bit, but the wife bought a 2019 automatic with only 2000 miles on it now and hers makes the noise too! Although hers sounds less lugging than mine with more millage.

I tried the mid grade Chevron gas and it does help a bit, but not completely.

I might try a different oil next. I'm using full synthetic but I might try a cycle of part synthetic to see?

Another thing I wondered about is the ethanol they add to gas in Washington State. Maybe the 3.6 just does not like it?

When I bought the extended warranty I felt like I was getting robbed, but now I'm glad I got it just in case this engine fails!

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[JFoPDX]

*****NEVER MIND. THIS DIDN'T HELP**** Possible Solution: I've read all the posts in this thread because I was hearing a rattling sound when I accelerated. It was like the sound a diesel truck makes but not as loud. Usually, I would hear it going up hills or just lightly pressing the gas. It would last for a few seconds then stop but do it again when I pressed the gas again. I finally took it in without much hope that they would find it given all the other posts. To my surprise, they said it was the muffler assembly. They ordered new parts, fixed it and got my Jeep back yesterday. I haven't heard it since. The noise was pretty consistent before I took it in so I'm crossing my fingers that it doesn't return. I hope this helps.

 

[calman]

Possible Solution: I've read all the posts in this thread because I was hearing a rattling sound when I accelerated. It was like the sound a diesel truck makes but not as loud. Usually, I would hear it going up hills or just lightly pressing the gas. It would last for a few seconds then stop but do it again when I pressed the gas again. I finally took it in without much hope that they would find it given all the other posts. To my surprise, they said it was the muffler assembly. They ordered new parts, fixed it and got my Jeep back yesterday. I haven't heard it since. The noise was pretty consistent before I took it in so I'm crossing my fingers that it doesn't return. I hope this helps.

Thanks for this information! Can you indicate what the work order from the dealership says? Ideally it includes a description of the section of the muffler assembley causing the rattle and what parts were ordered.

 

[Dave31]

I just answered and will continue assisting from there. I'd also like to note our team are not trained as technicians nor can we diagnose vehicles over the internet. This is why we encourage you to continue working with your dealer but we can escalate a case to make sure all options have been explored during service. Thank you for your time and hope to hear from you soon.

Jasmine
Jeep Social Care Specialist

Has there been a solution to this problem? My 2019 rubicon only has 2500 miles on it and has this noise after letting off gas then accelerating . A $60000 vehicle should not have this problem. It just started so I will try premium fuel and then bring it to the dealer .

 

[JeepCares]

Has there been a solution to this problem? My 2019 rubicon only has 2500 miles on it and has this noise after letting off gas then accelerating . A $60000 vehicle should not have this problem. It just started so I will try premium fuel and then bring it to the dealer .

Hi Dave31,
Thank you for reaching out to us about your concern. As our team is not mechanically trained, we recommend having your dealer look into this for you. If you would like any additional assistance throughout that process, please feel free to send us a private message and we'll be happy to connect you with a Case Specialist!
Laura
Jeep Social Care Specialist

 

[JFoPDX]

Thanks for this information! Can you indicate what the work order from the dealership says? Ideally it includes a description of the section of the muffler assembley causing the rattle and what parts were ordered.

Sorry to say, the noise came back. I'll be taking it back to the dealership as soon as I have some time. I'll be updating my message from before.

 

[JFoPDX]

Possible Solution: I've read all the posts in this thread because I was hearing a rattling sound when I accelerated. It was like the sound a diesel truck makes but not as loud. Usually, I would hear it going up hills or just lightly pressing the gas. It would last for a few seconds then stop but do it again when I pressed the gas again. I finally took it in without much hope that they would find it given all the other posts. To my surprise, they said it was the muffler assembly. They ordered new parts, fixed it and got my Jeep back yesterday. I haven't heard it since. The noise was pretty consistent before I took it in so I'm crossing my fingers that it doesn't return. I hope this helps.

Update: The noise came back. This didn't help so I'm going to make another appointment as soon as I have time. Does anyone have a solution for this???? IT'S ANNOYING!

 

[CZ 75]

Bottom line is that its predetonation. I still get a touch of it now in 2nd and 3rd gear even with 93 octane.

 

[DougJaneway]

Bottom line is that its predetonation. I still get a touch of it now in 2nd and 3rd gear even with 93 octane.

Yeah, it's greatly diminished with high quality 93 Octane but it still exists.

 

[calman]

I also think it is pre ignition knocking. Curious. Does anyone experiencing this issue have an after market cold air intake installed?

 

[sapiel]

Have the same exact issue - sounds identical to the sound clip posted earlier. Went in yesterday to ask the dealer about it and get the damper recall done while at it. Got the car back today - they confirmed the noise, stated that it sounds like engine knock or timing being off, and suggested putting different/higher octane gas. Will give that a shot but sounds like it’s not going to fix it based on the feedback here. I hope that this knock doesn’t damage or blow the motor or something along those lines, especially if I’m out somewhere remote/off-road.

 

[JeepCares]

Have the same exact issue - sounds identical to the sound clip posted earlier. Went in yesterday to ask the dealer about it and get the damper recall done while at it. Got the car back today - they confirmed the noise, stated that it sounds like engine knock or timing being off, and suggested putting different/higher octane gas. Will give that a shot but sounds like it’s not going to fix it based on the feedback here. I hope that this knock doesn’t damage or blow the motor or something along those lines, especially if I’m out somewhere remote/off-road.

Hi Stan,
If you continue to experience this, please feel free to send our team a private message. We'd be happy to connect you with Case Specialist to work alongside your dealer.
Alex
Jeep Social Care Specialist

 

[LVJeepn]

I don't have a "knock" per say, but I do notice a slight rattle or fluttering when I let off the gas. From what I have read it has something to do with the waste gate on the turbo. It is very faint so unless it gets worse, I can live with it.

 

[Yellohat]

Hi everyone,

I've got some information that might be extremely helpful to all of us. After reading 14 pages of this thread I felt I needed to create an account and chime in.

I've had my Jeep for 6 years, 2010 bought it certified pre-owned with only 15k miles on it. 6 speed manual.

I noticed this clatter that you all are describing and recording and asking every technician about probably within my first 6 months of owning the jeep. Just like you I noticed it got worse with a warmer engine and on hotter days. Really gets bad when stuck in traffic and your riding the clutch.

I went through the ruckus you did searching for the problem and than finally I got a manager from the dealership to go on a test drive with me and finally I was able to replicate the noise. Had found a spot with brick walls in either side and we rolled down the window and I keep just driving back and forth. As with all of your it's worse when on low rpm trying to get up to speed. That's what I did to replicate really just low balled my gear and finally he heard it and as soon as he heard it he knew what it was with full confidence.

Now I'm gonna describe what he told me because at the time he said it's like a disease in your Jeep, not damaging the engine or fear if it failing disease but more of a the noise will continue to get worse and worse with age on the jeep. He actually told me it does no harm to your Jeep other than the annoyance of hearing it. The reason I didn't get it fixed when he knew what it was was because he told me the solution to it so I just adjusted my habits and the noise hot immensely better but the problem with a disease like this just as he told me it will get worse no matter what all you can do is try and avoid it. Now here I am and years later the noise is back and annoying as ever. Some days I can drive perfect and not hear a thing other days when I hit bad traffic or that dumba** in front of me at the light just decides to stop accelerating for no reason leaving me mid gear and in that awkward zone of shifting.

Now I'm not a mechanic just a guy who knows enough to do minor things for maintenance. I'm ready to go back in and get this fixed but I can remember what the name was of what he said the issue is. I'm hoping if I explain in great detail what he told me someone reading this will understand what I'm explaining and know what he is describing.

Here's what he told me. Wranglers are geared for high rpm they are made with a designed shift point of 2500rpm to 3000rpm. At this time I was shifting my rpms at around 1500 or so. He said that there are these rods or pieces (I can't remember exactly what he said they where I always remember being rods but could be wrong) inside the engine that are long and round, what happened is that they are made to spin it move or whatever at this high rpm. So when you don't drive at that high rpm these rods will end up hitting the containment around them. I imagine it like a tube with a long rod inside of it. These rods are round and when they are round you won't hear any noise or clatter at all. Once you start driving at low rpm these rods start to hit their side walls and bounce around. That's the noise but over time of not driving the engine properly these rods turn from round into an egg shape and he said once they turn into an egg shape it's almost impossible to drive without hearing this noise because now it's an egg shaped rod inside a circular containment. This egg is elongated making it hit those walls much easier.

He said you just need to replace these rods and the noise will go away. He said it all comes down to driving the jeep engine properly. After talking with him he said that if I changed my driving habits the noise would go away and he was absolutely right but as we all know you can't always drive perfect. When I'm stuck in 5 0 click traffic is pretty hard to get my gears up to 2500rpm because I have little space or time. Sometimes your just riding that clutch and moving forward a car space at a time. This is what can make the issue worse and what has led me back here.

He even went on to explain that because of this issue he will try and divert older people from buying a Jeep especially an automatic because they drive so slowly that the jeep never gets the high rpm that's needed and that within even 2k miles they will come in complaining about this clatter. With an automatic he said this issue is even harder because you have to kinda always be throttling it verse in a standard I know that I can control my rpm and the computer won't try and shift me early because it can.

I do agree that the timing issue you all describe sounds right and maybe that pre ignite or that computer update might be exactly it but even so this issue I've described has to be the fallout of that issue. I don't know if that timing matters in a standard Jeep like mine and my issue is just driving the right rpm.

Anyways if you know what this rod is or what part of the engine I'm describing will you please let me know and all of us know cause than people can get it fixed and just like me just adjust how they drive to avoid it in the future. I'm hoping that the same manager who helped me find the problem still works there and I can find him and talk to him about the issue again but until then I'm hoping you all can help.

 

[jdubya421]

I have noticed this too in my 19 sport 6 speed. I only notice it when accelerating in 2nd or 3rd gear under 2k rpms. To me it just sounds like the engine bogging down. Like the guy above me just said, the Jeep is designed to shift around 3k. How he was shifting at 1.5 I will never know. If you shift from 1st to 2nd at 1.5k you'll end up in 2nd gear at like 500rpm and of course the engine is gonna bog down.

I have been in several threads about the manual transmission and I shift from 3-3.5k every gear and still average over 20mpg. The engine needs those revs. At least in my Jeep the noise completely goes away above 2k rpms because the engine has sufficient revs (HP and Torque) to move the wheels.

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