Sierra 1500 2WD V8-5.3L Hybrid (2004)
Heat Shield: All Technical Service Bulletins
Exhaust System - Popping/Snapping Noise When Hot/Idling
Bulletin No.: 03-06-05-008D
Date: March 05, 2007
TECHNICAL
Subject:
Exhaust Popping/Snapping Noise When Vehicle is Hot, at Idle, or Immediately After Vehicle is Shut Off (Replace Muffler Heat Shield)
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)
Supercede:
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
Follow the service procedure below to correct this condition.
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.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
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.
