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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 27664
Experience:  GM Grand Master Technician 2007. 11 years experience.
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2010 chevy: 4wd..popping..vehicle is cooling down, but these noises

Resolved Question:

I have a 4wd 2010 chevy silverado with 2200 miles. I have popping/snapping noises from underdeath the vehicle at idle (for example at a stoplight) or immediately after the vehicle is shut off. I know some noise is expected when vehicle is cooling down, but these noises seem excessive. I know there are TSB for prior year models related to this problem.
Submitted: 3 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 3 years ago.

Hi, I'm Cam. May I ask your first name?
I am working to get you a fast accurate answer. About your vehicle, What is the VIN please?

 

Customer: replied 3 years ago.

Hi Cam,

 

I'm Brian

 

VIN=1GCPKPEA6AZ186241

Expert:  GM Tech (Cam) replied 3 years ago.
#07-06-05-001G: V8 Engines-Muffler Heat Shield Buzz During Vehicle Operation or Exhaust Pinging/Popping/Snapping Noise (Normal Condition) When Vehicle Is Hot, At Idle or Immediately AFter Vehicle Is Shut Off - (May 7, 2010)

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Subject:V8 Engines - Muffler Heat Shield Buzz During Vehicle Operation or Exhaust Pinging/Popping/Snapping Noise (Normal Condition) When Vehicle is Hot, at Idle, or Immediately After Vehicle is Shut Off (Perform Repair as Outlined Below)

Models:2007-2010 Cadillac Escalade, Escalade Hybrid, Escalade ESV, Escalade EXT
2007-2010 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe, Tahoe Hybrid
2007-2010 GMC Sierra 1500, Sierra Denali, Yukon, Yukon Hybrid, Yukon XL, Yukon Denali, Yukon Denali XL
Equipped with the following V8 Engines:
- 4.8L (RPO LY2, L20)
- 5.3L (RPOs LC9, LH6, LMG, LY5)
- 6.0L (RPOs LFA, L76, LZ1, L96)
- 6.2L (RPOs L9H, L92, L94)
Please Refer to GMVIS

 



This bulletin is being revised to update model years/models, add RPOs and a pinging condition. Please discard Corporate Bulletin Number 07-06-05-001F (Section 06 - Engine/Propulsion System).


Condition

Some customers may comment on a pinging/popping/snapping noise from underneath the vehicle at idle or immediately after the vehicle is shut off. Pinging/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 Pinging/Popping/Snapping:

As the exhaust system cools, the muffler shell and muffler internals contract at different rates. Pinging/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 Pinging/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

Customer: replied 3 years ago.
So this seems to indicate that the popping/snapping noise is normal, even though it is can be heard at idle with windows closed.
Expert:  GM Tech (Cam) replied 3 years ago.

If we are indeed talking about the exhaust, then yes.

Installing straps should reduce it.

 

GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 27664
Experience: GM Grand Master Technician 2007. 11 years experience.
GM Tech (Cam) and 4 other Chevy Specialists are ready to help you

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