2015 YUKON NOISE IN CABIN

[TOBTEK]

Tobtek / jasondenali15 - how about you guys posting some pics w/wo tape. Also Tobtek, were the EPs made of rubber or foam? Next time you may want to go large and get the 40 cent plugs.

 

They were the dense foam type. Pinch them and they compress, then re-inflate if you will. Then had masking tape to secure them. I'll try the cotton balls later.

Sitting in the passenger seat in this Boom Box taking the kids to school. My ears are actually ringing from the insistent buffeting, and booming. Such a disappointment.

[TOBTEK]

Per post 639..... I'll call my dealer today and inquire about this form fitting headliner. I think this Escalade is getting worse at now over 1500 miles.

[jasondenali15]

After driving with the 3 mics plugged for about a day now, I would definitely say the ear pressure is no longer present. Having said that, the vehicle does make some very loud noise in the cabin as you accelerate. It is a really weird sound which hard to describe. It is disproportionately loud. Not an exhaust or "throaty" sounds. Most noticeable around 28-34 mph. The noise is only present when you accelerate and goes away once you get to your desired speed and does not come back as you slow down. Only when you hit the gas...like some gears are louder than others.

 

Anyone else getting a noise with the mics plugged? At the end of the day, the noise is far more tolerable than the pressure in my ears.

[The Zip]

Tobtek - dense foam should have been the ticket, that's how I pictured the EPs to perform. Interested to know how the cotton balls and tape works, it appears one size won't fit all. In other words, a concept that works for one may require a different concept for another.

Tobtek - dense foam should have been the ticket, that's how I pictured the EPs to perform. Interested to know how the cotton balls and tape works, it appears one size won't fit all. In other words, a concept that works for one may require a different concept for another.

[The Zip]

Tobtek - dense foam should have been the ticket, that's how I pictured the EPs to perform. Although if the EP didn't totally fill the space, you would still be experiencing the issue. Try this, put cotton in the O ring to fill loose space then replace the EP again. Or just stuff cotton then tape, both seem logical. Interested to know how the cotton balls and tape works, but based on your input, it appears one size won't fit all. In other words, a concept that works for one may require a different concept for another. Instead of the MP concept you may require the MW concept

[The Zip]

jasondenali15 - what you are experiencing was already there, ear pressure was a distraction. Plugging the mics addressed the pressure issue, but as a residual, you've eliminated ANC to cancel other noises. The mics are the beginningstage of ANC. The mics may no longer hear, but now you do. Makes sense?

[The Zip]

Keep posting data, the MW may end up being a better option than the MP. We may not want to totally disallow the mic to hear, but rather confine what it hears to a room versus the entire house. Mitigate pressure and noise. This thread was focused on pressure, now that the pressure "may" be mitigated, it seems a logical transition to noise.

[The Zip]

Anyone receiving pressure associated with this thread, respectfully request you provide the following data;

 

-- Walk around your truck or sit in all the seats and press the headliner. When you begin to feel resistance, stop and guestimate how far you pressed in, provide a result in inches at each point where you measured. Example, driver door 1", rear hatch 2.5", etc, etc

 

-- What is you vehicle brand

 

-- Is your vehicle extended or not

[october]

Anyone know which mic is the cell phone bluetooth mic?

[TOBTEK]

October... I believe it's in your headliner, about one inch behind the sun visor.

[The Zip]

October - every now and again it's good to stop by the side of the road and smell the roses, the Bluetooth mic is above the driver sunvisor

[Wrench589]

The headliner in our definitely moves when pressed on. Upwards of 1" depended where exactly I check it. As I have posted previously, and nobody responded, give it a whack with the heel of your hand. When I do, I can hear the exact same "boom" sound I hear when driving it and getting the "buffeting".

 

As far as cotton balls, or ear plugs, or whatever, I tried the cotton balls under the grill on all 3 noise cancelling microphones. IT DID NOT ELIMINATE THE BOOMING SOUND OR THE BUFFETING. In fact, the sound pressur elevel actually went up at certain frequencies compared to the fully functioning noise cancelling system, as proven by sound pressure measurements with a 1/24th octave analyzer.

 

From all the work and testing I've done, I am pretty sure that there is a lightly damped structural resonance in this vehicle, most likely the roof, that is easily excited by things like the overly-stiff suspension. To fix this will be challenging.

 

One last thing - I am pretty sure I observed the following. I cracked the front two side windows open just a sliver (real hard to do, with the express-down feature!). I did this while the buffeting was occuring and I am pretty sure the pressure sensation ceased. Could still "hear" the sounds associated, but the "feeling" ceased. Early on in this thread, we discounted opening the windows as having any effect. Might have to retract that. WOULD BE INTERESTED TO HEAR RESULTS OF SOMEONE ELSE TRYING THIS.

[Wing350]

My 2 cents . . .

 

I don’t think I’ve got the noise cancellation feature in my Chevy so I don’t think it’s the SOURCE of the problem.

 

But did anyone notice that the Service Bulletin PIT5318 was updated on Nov. 19, 2014? They added some interesting wording . . .

 

“In some cases, correcting the roof bows may not eliminate the body pressure booming issue due to the fact that the roof is being excited by some other input(s). Examples of inputs that can excite the roof may be: tires with excessive road force, exhaust back pressure valve issues, and/or rear axle related issues such as pitchline runout. These other areas may need to be addressed if the body pressure booming is still present at the completion of this PI.”

 

Then later . . .”The body booming issue may be more noticeable when the engine is in V4 mode.”

 

I read this to say this is a huge, messy and costly repair that might not totally resolve the problem. But it is the problem.

[Wrench589]

My 2 cents . . .

 

I don’t think I’ve got the noise cancellation feature in my Chevy so I don’t think it’s the SOURCE of the problem.

 

But did anyone notice that the Service Bulletin PIT5318 was updated on Nov. 19, 2014? They added some interesting wording . . .

 

“In some cases, correcting the roof bows may not eliminate the body pressure booming issue due to the fact that the roof is being excited by some other input(s). Examples of inputs that can excite the roof may be: tires with excessive road force, exhaust back pressure valve issues, and/or rear axle related issues such as pitchline runout. These other areas may need to be addressed if the body pressure booming is still present at the completion of this PI.”

 

Then later . . .”The body booming issue may be more noticeable when the engine is in V4 mode.”

 

I read this to say this is a huge, messy and costly repair that might not totally resolve the problem. But it is the problem.

 

Exactly.....

 

Any chance of getting a copy of that Service Bulletin?

[yukontruckman]

My 2 cents . . .

 

I don’t think I’ve got the noise cancellation feature in my Chevy so I don’t think it’s the SOURCE of the problem.

 

But did anyone notice that the Service Bulletin PIT5318 was updated on Nov. 19, 2014? They added some interesting wording . . .

 

“In some cases, correcting the roof bows may not eliminate the body pressure booming issue due to the fact that the roof is being excited by some other input(s). Examples of inputs that can excite the roof may be: tires with excessive road force, exhaust back pressure valve issues, and/or rear axle related issues such as pitchline runout. These other areas may need to be addressed if the body pressure booming is still present at the completion of this PI.”

 

Then later . . .”The body booming issue may be more noticeable when the engine is in V4 mode.”

 

I read this to say this is a huge, messy and costly repair that might not totally resolve the problem. But it is the problem.

 

Makes sense. The majority of problems reported here are the extended versions (Suburban, XL & ESV). A longer roof panel/sheet metal would certainly flex more.