Canyon 4WD L5-3.5L VIN 6 (2004)
Muffler: All Technical Service Bulletins
Exhaust System - Poping/Snapping Noise When Hot
Bulletin No.: 04-06-05-005A
Date: December 16, 2004
TECHNICAL
Subject:
Popping/Snapping Noise When Vehicle is Hot, at Idle or Immediately After Vehicle is Shut Off (Replace Muffler Heat Shield)
Models:
2004-2005 Chevrolet Colorado
2004-2005 GMC Canyon
Supercede:
This bulletin is being revised to include parts availability and repair instructions. Please discard Advanced Service Information Bulletin Number
04-06-05-005 (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.
The noise may be intermittent depending on the outside temperature and or temperature of the exhaust system at the time of testing. Some
popping/snapping noise from the exhaust system during cool down is a normal condition.
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
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.
Follow the service procedure below to correct this condition.
1.
Raise and support the vehicle.
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.
Important:
