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#4596459 - 12/06/17 07:48 PM Exhaust drone?
LeakySeals Offline


Registered: 02/18/11
Posts: 6573
Loc: Hudson, NH
After months of exhaustive searches and $$$ replacing various engine components, would appear my "rough idle" is actually exhaust drone. Is anyone else familiar with this issue??
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4596462 - 12/06/17 07:50 PM Re: Exhaust drone? [Re: LeakySeals]
bdcardinal Offline


Registered: 06/03/05
Posts: 10992
Loc: Santa Barbara, CA
Factory exhaust?
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1995 Ford Mustang GT

Ford/Mazda Parts Counter
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Opinions expressed are my own.

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#4596465 - 12/06/17 07:52 PM Re: Exhaust drone? [Re: LeakySeals]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
At IDLE RPM?!?!?

Usually, exhaust systems do not resonate at such a low frequency.

Typically, build a Helmholtz exhaust resonator to fix the issue.
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"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4596466 - 12/06/17 07:52 PM Re: Exhaust drone? [Re: LeakySeals]
TinyVoices Offline


Registered: 09/12/16
Posts: 480
Loc: Vienna, VA
Common with cheap aftermarket mid pipes.
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1993 Toyota MR2 Hardtop N/A - 157k miles - Valvoline Max Life 5w30
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#4596472 - 12/06/17 08:00 PM Re: Exhaust drone? [Re: LeakySeals]
BrocLuno Online   content


Registered: 09/06/15
Posts: 5518
Loc: Kalifornia Kollective
How did you diagnose? Usually a rough idle will have the engine shaking under the hood. So open hood, vehicle chocked and in gear at idle and you can see the engine moving. If it's sitting still, it's something else ...
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4596496 - 12/06/17 08:16 PM Re: Exhaust drone? [Re: LeakySeals]
eyeofthetiger Offline


Registered: 11/18/17
Posts: 683
Loc: South Carolina
Aside from the cheap aftermarket replacement exhausts, this can also happen with gutted catalytic converters. Is it the Escalade or the Maximia?
_________________________
2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh

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#4596501 - 12/06/17 08:20 PM Re: Exhaust drone? [Re: LeakySeals]
Colt45ws Offline


Registered: 08/15/06
Posts: 9640
Loc: Central Washington
Is it possibly a big leak and not a drone per say?
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#4596520 - 12/06/17 08:28 PM Re: Exhaust drone? [Re: LeakySeals]
LeakySeals Offline


Registered: 02/18/11
Posts: 6573
Loc: Hudson, NH
Its the Escalade 6.0 AWD. OEM exhaust. Brand new catalyst. And apparently the OEM exhaust is partly to blame. Because some claim to get rid of the moan/drone using a rerouted aftermarket exhaust for huge money. The area that wraps from the driver's side over the transmission pan vibrates for some like me. Got worse after the new 3 way cat was installed by dealer. Its real throaty, many would love it. I hate all that noise and vibration. I knocked that area it with a rubber mallet, feels just like what I feel at the gas pedal.

Supposedly 2 of these weird things hanging off the exhaust helps.




I also found this which refers to the issue

Document ID# 1820205
Subject: Exhaust Vibration,Resonance,or moan.
Also look for #PIP3121E (04/24/06)
Includes:
01-06Cad Escalade
02-06 Chev Av
99-06 Chev Silv
00-06 Chev Sub, Tahoe
99-06 GMC Sierra
00-06 GMC Yukon
03-06 Hummer

Condition is listed as "some 99-06 with single exhaust system may exhibit exhaust vibration that is engine load sensitive. Typically, this will happen just off idle to 2000 RPM on light acceleration."
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4596547 - 12/06/17 08:44 PM Re: Exhaust drone? [Re: LeakySeals]
Nick1994 Offline


Registered: 02/19/13
Posts: 10108
Loc: Phoenix, AZ
Have you crawled underneath to look at it? The exhaust could be rubbing on something.
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2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

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#4596554 - 12/06/17 08:46 PM Re: Exhaust drone? [Re: LeakySeals]
eyeofthetiger Offline


Registered: 11/18/17
Posts: 683
Loc: South Carolina
Oh yeah, I think I know exactly the drone you are talking about now. I never had anyone complain about it, so I never had to fix it. I have seen those vibration damping weights on some models. That is probably a good fix as long as the weights are designed for this specific application.
_________________________
2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh

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#4596565 - 12/06/17 08:53 PM Re: Exhaust drone? [Re: Nick1994]
LeakySeals Offline


Registered: 02/18/11
Posts: 6573
Loc: Hudson, NH
Originally Posted By: Nick1994
Have you crawled underneath to look at it? The exhaust could be rubbing on something.

Oh yeah. I know every inch of that truck. My baby. She's clean under there. The exhaust is very close to a mount. But thats supposedly normal. Other than that a rubber muffler mounting bracket has a small tear. The rest has no rust, like new.
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4596684 - 12/06/17 11:30 PM Re: Exhaust drone? [Re: LeakySeals]
rubberchicken Offline


Registered: 07/07/08
Posts: 399
Loc: Maryland USA
I would go with the exhaust weights: cheap fix. Not sure why you would need 2 though, but whatever others have claimed works, I would do that and be done with it.
They are just painted , so I would not expect them to last more than 5 years.

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#4596736 - 12/07/17 02:40 AM Re: Exhaust drone? [Re: LeakySeals]
Olas Offline


Registered: 12/11/13
Posts: 3933
Loc: Manchester, England
Fit an external tach to verify idle rpm.
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Cable ties should hold it

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#4596919 - 12/07/17 09:01 AM Re: Exhaust drone? [Re: LeakySeals]
LeakySeals Offline


Registered: 02/18/11
Posts: 6573
Loc: Hudson, NH
It has a tach. It does happen 1800-2k rpms under certain conditions. Vibration runs right up your leg.. lol
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4601053 - 12/11/17 08:33 PM Re: Exhaust drone? [Re: LeakySeals]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
LOL, your issues wan't "acoustic drone", you are experiencing an unintentional mechanical harmonic.

Try the weights - they are cheap.

ANY amount of mass WILL affect the frequency that the harmonic occurs.
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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