Chattering Noise when Accelerating Manual Transmission

[onewhippedpuppy]

It’s annoying, but that doesn’t make it ok just because nothing is broken. This isn’t “just a Jeep thing”, it’s an obvious vibration/resonance that is intermittent but seems to be consistent between multiple Jeeps. So there is obviously a common design or assembly issue that leads to this happening. It also occurs when accelerating at approximately 3,000 RPM, so the clutch is fully released. No matter how bad you are at driving stick, this isn’t related to user error.

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[NachoRuby]

It’s annoying, but that doesn’t make it ok just because nothing is broken. This isn’t “just a Jeep thing”, it’s an obvious vibration/resonance that is intermittent but seems to be consistent between multiple Jeeps. So there is obviously a common design or assembly issue that leads to this happening. It also occurs when accelerating at approximately 3,000 RPM, so the clutch is fully released. No matter how bad you are at driving stick, this isn’t related to user error.

I agree, but if the alternative is an automatic, I'll deal with it. I wish it did it all the time, so that it would be obvious when I got to the dealership, and they could find/fix the issue. I think @81Mojave might be on to something, though. I've been perusing the JL forums, and they don't have this issue that I can see. Seems like it's just on gladiators.

 

[ShadowsPapa]

I agree, but if the alternative is an automatic, I'll deal with it. I wish it did it all the time, so that it would be obvious when I got to the dealership, and they could find/fix the issue. I think @81Mojave might be on to something, though. I've been perusing the JL forums, and they don't have this issue that I can see. Seems like it's just on gladiators.

There ya go.
What's different......
Well, likely tunes for one thing, but shielding, routing of lines, exhaust, other fun stuff.

I understand noises can be very irritating and frustrating - but sometimes every rattle or ping sound gets lumped in with all the others.

If it's the rattle of a pipe, tube, shield or so on - that's one animal that shouldn't be there.
No excuse for body related rattles which include exhaust pipes, cooling lines, braces, shields (including heat shields) and that sort of thing.

If it's an occasional ping of mild detonation - that's likely just how it's going to be.

But so far in the last couple of years they've all been tossed in together.

My comments were relating to the sounds of ping or detonation which can sound like a rattle.
Those can be changed by keeping the RPM up higher, shifting later, that sort of thing. People keep insisting that they've got to use their old ways and habits, or are so very afraid of winding one of these up I can imagine based on years of comments here that there's people trying hard to shift before the damn thing hits 3,000 RPM.
If I had a stick I'd be winding it up into the middle 3,000s before thinking of shifting. I often wind my 4.0 up tighter than that and it redlines WAY below these things.
Wind that baby up. Even with my automatic, I push to ensure it DOES downshift and I keep the RPM up if on any hills or with a load.

Just tossing stuff out because when I see people trying to keep the RPM down to 2500 or below - I have to wonder........

Maybe that's why I'm on my second set of hydraulic clutch cylinders - I keep shifting and keep the RPMs up.

 

[onewhippedpuppy]

When I’m accelerating onto the highway I routinely rev to 6,000 RPM. The V6 makes it’s power up high, it’s a total dog if you lug it around. One of many reasons why it’s a sorry engine for a Jeep, but that’s a topic for another thread…..

I’m an engineer and former mechanic, this is most definitely more than detonation, which by the way is basically a thing of the past with modern engine management. I think resonance is probably the best way to describe it because it’s RPM dependent and seems to be set off in the same relatively tight frequency range. I would like to do some experimenting with climate control settings, because it sounds (which can be deceiving) like it’s coming from inside of the dash. So I’m curious if it’s something loose associated with a blend door that resonates with engine RPM.

 

[NachoRuby]

When I’m accelerating onto the highway I routinely rev to 6,000 RPM. The V6 makes it’s power up high, it’s a total dog if you lug it around. One of many reasons why it’s a sorry engine for a Jeep, but that’s a topic for another thread…..

I’m an engineer and former mechanic, this is most definitely more than detonation, which by the way is basically a thing of the past with modern engine management. I think resonance is probably the best way to describe it because it’s RPM dependent and seems to be set off in the same relatively tight frequency range. I would like to do some experimenting with climate control settings, because it sounds (which can be deceiving) like it’s coming from inside of the dash. So I’m curious if it’s something loose associated with a blend door that resonates with engine RPM.

Very interested to see what you find out. I've always thought the same, it's a resonance thing. But I'm not smart enough to figure it out! Good luck.

I do really like the transmission, but this is noise, while intermittent, is annoying, when it does it. Mine does it maybe one trip every few months, and much more frequently when it's hot. RPM range is 2800-3200. It doesn't sound like detonation or ping. It sounds like a vibration.

 

[onewhippedpuppy]

Mine always does it, but it takes a longer trip before it starts happening. Our drive to the lake is close to 5 hours so I get to enjoy the sound every few weeks in the summer.

 

[onewhippedpuppy]

Update, I’ve done a lot of trial and error with HVAC settings and it doesn’t seem to make any difference at all. I rode with a friend in his late model JKU Rubicon with the V6 and manual transmission over the weekend and it makes the same sound. He said it’s been doing it forever and it bugs the crap out of him. So I’m going to do some JK searching to see if anybody on that side has figured it out.

 

[JeepCares]

Update, I’ve done a lot of trial and error with HVAC settings and it doesn’t seem to make any difference at all. I rode with a friend in his late model JKU Rubicon with the V6 and manual transmission over the weekend and it makes the same sound. He said it’s been doing it forever and it bugs the crap out of him. So I’m going to do some JK searching to see if anybody on that side has figured it out.

Hi, onewhippedpuppy. Our team recommends a dealership visit for this. If you need support while there, let us know.

Kate
Jeep Cares

 

[NachoRuby]

Hi, onewhippedpuppy. Our team recommends a dealership visit for this. If you need support while there, let us know.

Kate
Jeep Cares

Do you know if there's a fix? Because this has been a thing reported by many manual owners since the gladiator came out. This is really my only problem with the vehicle. That noise. I've been to the dealership several times.

 

[onewhippedpuppy]

Hi, onewhippedpuppy. Our team recommends a dealership visit for this. If you need support while there, let us know.

Kate
Jeep Cares

I’ve already wasted one trip to my dealership and they were unable to duplicate the issue. Considering this appears to be an issue across multiple Wrangler and Gladiator models I would think some information or knowledge would exist on the topic. Until I can conclusively duplicate the issue I’m not going to waste my time and be multiple days without a car.

 

[NachoRuby]

I’ve already wasted one trip to my dealership and they were unable to duplicate the issue. Considering this appears to be an issue across multiple Wrangler and Gladiator models I would think some information or knowledge would exist on the topic. Until I can conclusively duplicate the issue I’m not going to waste my time and be multiple days without a car.

I'm thinking about just stuffing the dash with dynomat or some other sound deadening material. It's annoying to me when it does it, but it doesn't do it when I need it to ( at the dealership.)

 

[Oldmon]

I’m so glad I found this thread. I’ve been experiencing this issue EXACTLY since almost day 1. I have a 21 Mojave manual trans. I bought it new last June. Only has 6500 miles on it. It sounds exactly like the videos posted. Definitely in that 3500ish rpm range. Definitely seems worse/more frequent in higher ambient temps. Most noticeable in 2nd gear for me, but that might just be because I spend most of my time on back roads (a lot of 2nd gear). Once I clear that rpm range, it disappears. It feels like resonance, for sure. It sounds like it’s coming from something right under the steering wheel or steering column. I’ve tried applying pressure to different spots under the leather/pleather cover directly below the wheel trying to see if it’s something in there. No luck so far. It’s extraordinarily annoying. It makes me feel like I’m driving some piece of junk as a teenager. It’s definitely not a Jeep thing! I had a JKU manual Willy’s and other/older jeeps…never experienced anything like this (not that it matters…completely different jeeps). I’m desperate for a solution, but I haven’t been eager to go the dealer troubleshooting route because it feels like they haven’t had much success replicating/identifying. It’s so frustrating/annoying that I will likely dump the car if a solution doesn’t become apparent. I love jeeps and I love my gladiator, but it’s honestly embarrassing when I have a passenger and I can’t believe it’s happening on a car approaching $60k.

 

[Oldmon]

It’s annoying, but that doesn’t make it ok just because nothing is broken. This isn’t “just a Jeep thing”, it’s an obvious vibration/resonance that is intermittent but seems to be consistent between multiple Jeeps. So there is obviously a common design or assembly issue that leads to this happening. It also occurs when accelerating at approximately 3,000 RPM, so the clutch is fully released. No matter how bad you are at driving stick, this isn’t related to user error.

Yes, exactly. Oddly, I’m excited I’m not alone. It gives me hope a solution will be found. It seems like such a small thing, but it really makes me dislike my Jeep/driving experience even though it doesn’t impact performance.

 

[Oldmon]

So, I'm still experiencing the "chattering", which is probably the best way to describe it. I paid more attention to it this summer and I cannot determine a rhyme or reason to it. Some days it happens, some days it doesnt. When it DOES happen, it happens consistently for that commute. It sounds, to me, like it's something in the steering column/under the wheel and it's a ressonance rattle. The only thing that's consistent about it is it's almost always most noticable at about 3,000 rpm, in 2nd gear, while accelerating. I tried to hold the rpm range and accentuate it for a video. If you turn it up, you'll hear it loud and clear at least 2 times when I'm in 2nd here. It's been an issue since the day I got the truck. 2021 Mojave 6 speed. I've had it for about 15 months and it has about 7k miles on it now.

 

[NachoRuby]

So, I'm still experiencing the "chattering", which is probably the best way to describe it. I paid more attention to it this summer and I cannot determine a rhyme or reason to it. Some days it happens, some days it doesnt. When it DOES happen, it happens consistently for that commute. It sounds, to me, like it's something in the steering column/under the wheel and it's a ressonance rattle. The only thing that's consistent about it is it's almost always most noticable at about 3,000 rpm, in 2nd gear, while accelerating. I tried to hold the rpm range and accentuate it for a video. If you turn it up, you'll hear it loud and clear at least 2 times when I'm in 2nd here. It's been an issue since the day I got the truck. 2021 Mojave 6 speed. I've had it for about 15 months and it has about 7k miles on it now.

I'm at 24k. Good news is it won't get worse. Bad news is it won't get better. Too many other things I like about it to let it really bother me though. I'll keep mentioning it every time I go in for service, and hope that maybe eventually there'll be a resolution.

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