Help diagnosing a weird sound.

[MikesMojito]

I plan to take this to my local dealer next week for warranty diagnosis and repair, but I was wondering if anyone here might know what I should look at or expect.

This is a 2025 JLU Willy's XR (Automatic Trans) with about 1,000 miles.

This has been a sound since day one, when I went back to the original dealer, a tech did a drive-along, and the noise from a major highway drowned out most of the sound, but he heard it and said, "It's just a high-pressure pump or normal sound from these newer cars."

I have noticed some rough shifts during the first few hundred miles, which have largely corrected (I assume due to ECU learning). However, when it's in 1/2/3 or I'm just barely cruising, I get some weird little shifts that almost feel like it's confused. (This could be completely unrelated)

The sound, in the video below, only occurs (or is only perceptible) when the vehicle shifts into 4th and is under some level of load. It almost sounds like a vacuum whistle.

Depending on the amount of throttle during that whistle, the timing lengthens or shortens, and the pitch may change slightly.

This recording was made using a DJI microphone placed on the inside of the passenger-side frame, near the fuel tank. (Included pic of location)

Are there any ideas I can explore myself or ways to make my "customer states" a little more intelligent? :D

Thanks!

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[mwilk012]

Which engine?

 

[jadmt]

if a 3.6 here is plenty of reading regarding your second issue...regarding the first it sounds normal to me.
https://www.jlwranglerforums.com/forum/threads/2024-jlur-with-slight-hesitation.125134/

 

[MikesMojito]

3.6 Pent

 

[mwilk012]

3.6 Pent

Dealers are idiots. There’s no high pressure pump on this engine.

 

[azjl#3]

whats the greyish bracket under the body?

 

[stretch-bsn]

whats the greyish bracket under the body?

Yeah I agree…that looks like cut and shaped thin plate steel with no factory powder coat…kind of odd.

 

[MikesMojito]

It's almost like a plastic shield, or air redirector, not quite sure. Not what's making the sound though, the sound seems to be a vacuum leak and only happens in 4th gear, replicatable.

 

[jadmt]

whats the greyish bracket under the body?

it is a deflector to protect the lines behind it...

 

[jadmt]

Yeah I agree…that looks like cut and shaped thin plate steel with no factory powder coat…kind of odd.

it is aluminum and it is a plate to protect the line connections behind it.

 

[stretch-bsn]

it is aluminum and it is a plate to protect the line connections behind it.

Ahh that would make sense.

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