Muffller Ping / Pang

[papapump51]

Well got about 3k on the truck now 5.3L NBS - Ok having cars and race bikes I understand the whole expansion of mufflers,metal under heat ETC but...

 

I was at a light lastnight and this Am and man sitting with the radio on windows up I could hear the Ping Pang Ping of the muffler expanding and such - it was very loud

 

Has anyone else had this issue of being this loud? or is it just the way these muffllers are on these trucks?

 

If it is I am soooo getting a new exhaust sooner than later...

[bgrif005]

yep...have this problem too. unless in rolling down the highway I hear it ping - pang all the time. I thought it would go away after the metal kinda "heat treated" itself after a few k miles, but not yet.

 

 

Thought I saw a TSB about this...

 

anyone else have this problem, but had it go away after some time?

[hubbycap]

There is a TSB. The problem is that the bands holding the heat shields around the exhaust system are not tight enough. The warranty fix is to tighten/replace the bands.

[papapump51]

Yea I was wondering if there was a TSB on this - I thought after it "broke in" it would not be as bad - on my other cars and bikes you would hear it after you stopped turned off the engine and the metal was cooling - I mean is sounds like someone is under the truck smacking the muffler - when i get out after I turn off the truck you can put your head in the wheel well and you knwo it is the muffler making all the noise for sure...

[papapump51]

Hubby you must have been posting the same time I was - I will give my dealer a call here shortly to set something up - Maybe I can get the Mrs to run the truck there on a day off -

[hubbycap]

I haven't brought mine up to the dealer yet. That is on a short nit-pik list for the next service interval. Really, it doesn't bother me. Kind of nostalgic, reminds me of the family Buick back in the '50s.

[papapump51]

HA that it is... the Dealer is 2 min from my house so the Mrs is running it there on Friday said it should only take an hour - I dont mind it everyone once in awhile because it happens it is physics but man it is like someone is playing the muffler drums ..no worries I still love my truck so no biggie - Ill get it fixed on Friday - thanks for the heads up HUBBY

[slomo007]

Mine only does it when I shut the truck off. You guys are saying that it's not normal, and can be fixed? Every chevy truck that has been in our family has made the same sound.

[todoubled05]

you aint the olny one papa. mine however wasent as loud as yours but when the truck is turned off it is really noticeable. when I replaced the factory exhaust with a flowmaster the pinging stoped.. even thought its not really bad its annoying...GO GET A FLOWMASTER NOW!

[jrrod2004]

you aint the olny one papa. mine however wasent as loud as yours but when the truck is turned off it is really noticeable. when I replaced the factory exhaust with a flowmaster the pinging stoped.. even thought its not really bad its annoying...GO GET A FLOWMASTER NOW!

 

 

I have the same problem with mine, except mine is the GMT800 series.....same tin can popping noise, dealer says that they would retighten the bands, but it will come back.....they even offered to replace the whole exhaust system for $650 with any brand that I wanted, except GM performance......I said "no" only because I didnt have the $$$ at the time....

[jrrod2004]

Document ID# 1912566

2007 Chevrolet Silverado Classic - 2WD

Subject:Exhaust Popping/Snapping Noise When Vehicle is Hot, at Idle or Immediately After Vehicle is Shut Off (Replace Muffler Heat Shield) #03-06-05-008D - (03/05/2007)

 

 

Models:2002-2006 Cadillac Escalade, Escalade EXT

 

 

2003-2006 Cadillac Escalade ESV

 

 

2002-2006 Chevrolet Avalanche, Suburban, Tahoe, Silverado, Silverado HD

 

 

2007 Chevrolet Silverado Classic, Silverado HD Classic

 

 

2002-2006 GMC Sierra, Sierra HD , Yukon, Yukon Denali, Yukon Denali XL

 

 

2007 GMC Sierra Classic, Sierra HD Classic

 

 

2003-2006 HUMMER H2

 

 

with 4.8L, 5.3L, 6.0L or 8.1L Gasoline Engine (VINs V, B, T, Z, N, V, G -- RPOs LR4, L33, LM7, L59, LQ9, LQ4, L18)

 

 

This bulletin is being revised to add the 2006 and 2007 (Classic Only) model years and the 5.3L (L33) engine. Please discard Corporate Bulletin Number 03-06-05-008C (Section 06 -- Engine/Propulsion System).

 

Condition

Some customers may comment on a popping/snapping noise from underneath the vehicle at idle or immediately after the vehicle is shut off. Some popping/snapping noise from the exhaust system during cool down is a normal condition.

 

The noise may be intermittent depending on the outside temperature and or temperature of the exhaust system at the time of testing.

 

Cause

As the exhaust system warms and cools, the muffler and the muffler heat shield expand and contract at different rates and may cause a popping and/or snapping noise.

 

Some popping/snapping noise from the exhaust system during cool down is a normal condition. The customer should be made aware that this service procedure is designed to reduce but not eliminate all exhaust system popping and snapping during cool down.

 

Correction

DO THIS

 

DON'T DO THIS

 

Install a new heat shield and straps on the existing muffler.

 

DO NOT replace exhaust system components other than the muffler heat shield.

 

Follow the service procedure below to correct this condition.

 

Important: Some popping/snapping noise from the exhaust system during cool down is a normal condition. The customer should be made aware that this service procedure is designed to reduce but not eliminate all exhaust system popping and snapping during cool down.

 

 

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.Caution:

   • In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.

    

   • Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges could result in serious personal injury.

    

   
    
   

2. Remove the nuts securing the muffler to the catalytic converter.
   
3. On 6.0L and 8.1L equipped vehicles only, loosen the exhaust pipe clamp.Important: Do not use oil base lubricants on the rubber exhaust hangers.
    
   
4. Apply a soapy solution to the exhaust pipe hanger rods in order to ease the removal of the exhaust hangers.
   
5. Pry the exhaust hangers free from the exhaust pipe hanger rods.Important: It is not necessary to remove the muffler from the vehicle to replace the muffler heat shield.
    
   
6. Reposition the muffler to gain access to the muffler heat shield.
   
    
   Notice: Use extreme caution not to damage the muffler when removing the heat shield from the muffler.
    
   
7. Using an air-powered hack saw blade, or equivalent, cut off the existing muffler heat shield just as the heat shield rises off of the muffler. See the illustration above.
   
8. Remove the heat shield from the muffler.
   
9. Hammer flush the remaining heat shield to the muffler.
   
    
   Important:

   • The new heat shield should not come in contact with the remaining muffler heat shield.

    

   • The new heat shield should not come in contact with the horizontal lock seam on the muffler.

    

   
    
   

10. Install the new heat shield (see parts list below) onto the muffler as shown above.
    
     
    
11. Install three straps, P/N 10391259, so that the strap screw head will be located on top of the muffler.Tighten
    Tighten the strap screw to 4 N·m (35 lb in).
     
     
    
     
    
12. Cut off the excess strap material and bend the strap over the strap screw head as indicated above.
    
13. Remove the exhaust pipe clamp.Important: ONLY 6.0L and 8.1L equipped vehicles require a new exhaust pipe clamp, P/N 15103174.
     
    
14. On 6.0L and 8.1L equipped vehicles only, install a new exhaust pipe clamp, P/N 15103174, on the exhaust pipe.
    
15. Reposition the muffler in the correct position.
    
16. Slide the muffler forward into position, aligning the studs with the rear of the catalytic converter.
    
17. Install the nuts securing the muffler to the catalytic converter, but DO NOT tighten at this time.
    
18. Apply a soapy solution to the following areas in order to ease the installation of the hangers.

    • The inner diameter of the exhaust pipe hanger

     

     

    • The exhaust pipe hanger rod

     

    
    

19. Press the exhaust pipe hangers over the exhaust pipe hanger rods.Tighten
     
    

    • Tighten the muffler nuts by hand until each contacts the metal flange.

     

     

    • Tighten the muffler nuts to 45 N·m (33 lb ft).

     

     

    • On 6.0L and 8.1L equipped vehicles only, tighten the exhaust clamp to 50 N·m (36 lb ft).

     

    
    

20. Lower the vehicle.
    

Parts Information

Part Number

 

Description

 

Qty

 

15253526

 

Shield, Muffler Heat Shield

 

(24 inch shield)

 

with 4.8L or 5.3L engine

 

1500 Series Base Utility Trucks ONLY

 

1

 

10393433

 

Shield, Muffler Heat Shield

 

28 inch shield

 

with 6.0L engine (LQ4, LQ9)

 

H2 or 1500 Series Luxury Utility Trucks ONLY

 

1

 

15808181

 

Shield, Muffler Heat Shield

 

25 inch shield

 

with 6.0L or 8.1L engine (LQ4, LQ9, L18)

 

2500 Series Utility, HD Pickups and Luxury Pickup Trucks ONLY

 

1

 

15103174

 

Clamp, Exhaust Pipe

 

with 6.0L or 8.1L engines ONLY

 

1

 

10391259

 

Strap, Muffler Heat Shield Strap

 

All Vehicles

 

3

 

15103184

 

Clamp, Exhaust Pipe

 

(pipe size 2.75")

 

(25 Series Suburbans/Avalanche and 8600 lb. 25 Series Pickups w/LQ4)

 

1

 

15102680

 

Clamp, Exhaust Pipe

 

(pipe size 3")

 

(25 & 35 HD Pickups w/LQ4 or L18 engines)

 

1

 

Warranty Information

For vehicles repaired under warranty, use:

 

Labor Operation

 

Description

 

Labor Time

 

L2540

 

Shield, Muffler Heat Shield - Replace

 

0.8 hr

 

 

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

© Copyright General Motors Corporation. All Rights Reserved.

 

 

Document ID# 1912566

2007 Chevrolet Silverado Classic - 2WD

[jrrod2004]

and here is the TSB for the GMT 900 Series models:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Document ID# 2052908

2008 Chevrolet Silverado - 2WD

Subject:Muffler Buzz During Vehicle Operation or Exhaust Popping/Snapping Noise When Vehicle is Hot, at Idle, or Immediately After Vehicle is Shut Off (Replace Straps on Muffler Heat Shield) #07-06-05-001B - (01/24/2008)

 

 

Models:2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT

 

 

2007-2008 Chevrolet Avalanche, Silverado (New Body Style), Suburban, Tahoe

 

 

2007-2008 GMC Sierra (New Body Style), Yukon, Yukon XL, Yukon Denali, Yukon Denali XL

 

 

This bulletin is being revised to address two common exhaust system concerns. Please discard Corporate Bulletin Number 07-06-05-001A (Section 06 -- Engine/Propulsion System).

 

Condition

Some customers may comment on a popping/snapping noise from underneath the vehicle at idle or immediately after the vehicle is shut off. Some popping/snapping noise from the exhaust system during cool down is a normal condition. The noise may be intermittent depending on the outside temperature and or temperature of the exhaust system at the time of testing.

 

Some customers may also comment on a buzz noise coming from the muffler during vehicle operation.

 

Cause

 

Exhaust Popping/Snapping:

As the exhaust system cools, the muffler shell and muffler internals contract at different rates. Some popping/snapping noise from the exhaust system during cool down is a normal condition.

 

 

Muffler Buzz:

If the muffler heat shield straps are loose, the heat shield may be free to buzz.

 

Correction

DO NOT REPLACE THE EXHAUST SYSTEM COMPONENTS.

 

 

Exhaust Popping/Snapping Noise:

This condition is normal to the muffler design and does not indicate poor quality or part failure.

 

 

Muffler Buzz:

Confirm the origin of the buzz by shimming (use metal shims) the straps tight and rerunning the vehicle. If the buzz concern is gone, then it is caused by the loose shield. Using the following procedure, install new straps to secure the heat shield to the muffler.

 

 

1. Install three straps, P/N 10391259, so that the strap screw head will be located on top of the muffler.Tighten
   tighten the strap screw to 4 N·m (35 lb in).
    
   
2. Cut off the excess strap material and bend the strap over the strap screw head.
   

Parts Information

Part Number

 

Description

 

Qty

 

10391259

 

Strap, Exhaust Muffler Heat Shield

 

3

 

Warranty Information

For vehicles repaired for a muffler buzz, use the following labor operation:

 

Labor Operation

 

Description

 

Labor Time

 

L9712*

 

Strap, Muffler Heat Shield - Replace

 

0.3 hr

 

*This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide.

 

 

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

© Copyright General Motors Corporation. All Rights Reserved.

 

 

Document ID# 2052908

2008 Chevrolet Silverado - 2WD

 

 

 

 

 

 

 

 

 

 

 

 

 

almost the exact same thing............

[ws6_guy]

My dads Blazers used to make that sound, nothing very loud though but after we would come home from somewhere far I could hear it doing it. My Silverado's old exhaust didn't do this, and now with my true dual Super 44s I cant even hear if theres a rattle in the cab

[papapump51]

I have heard it on all my cars in the past and bikes when turn them off but never sitting in the car with it just idling at a stoplight - Guess I will will have them put on the new bands or whatever and see what happens - also I will start looking for an exhaust - money might be a factor so maybe I will just change out the muffler or get the Magnaflow cat back I can get one of those cheap - we will see what GMC says on Friday

[unit731]

OK. 2008.

 

So some popping sound is acceptable. And there is no cure.

 

Unless one goes out and purchases a Flowmaster as stated above.

 

So, is GM using inexpensive stainless steel in these exhaust systems?

 

So, this mild popping I hear is going to happen for the next 10 years or longer for me?

 

What's the average life span of a factory OEM muffler/pipes? Miles/years?