GMC 2001 Yukon XL, Owner'S Manual

Page: 316 / 419

6-13
Noise Control System
The following information relates to compliance with
federal noise emission standards for vehicles with a Gross
Vehicle Weight Rating (GVWR) of more than 10,000 lbs.
(4 536 kg). The Maintenance Schedule provides
information on maintaining the noise control system
to minimize degradation of the noise emission control
system during the life of your vehicle. The noise control
system warranty is given in your warranty booklet.
These standards apply only to vehicles sold in
the United States.
Tampering With Noise Control
System Prohibited
Federal law prohibits the following acts or the
causing thereof:
1. The removal or rendering inoperative by any person,
other than for purposes of maintenance, repair or
replacement, of any device or element of design
incorporated into any new vehicle for the purpose
of noise control, prior to its sale or delivery to the
ultimate purchaser or while it is in use; or
2. The use of the vehicle after such device or element
of design has been removed or rendered inoperative
by any person.
Among those acts presumed to constitute tampering
are the acts listed below.
Insulation:
D Removal of the noise shields or any
underhood insulation.
Engine:
D Removal or rendering engine speed governor
(if equipped) inoperative so as to allow engine
speed to exceed manufacturer specifications.
Fan and Drive:
D Removal of fan clutch (if equipped) or rendering
clutch inoperative.
D Removal of the fan shroud (if equipped).
Air Intake:
D Removal of the air cleaner silencer.
D Reversing the air cleaner cover.
Exhaust:
D Removal of the muffler and/or resonator.
D Removal of the exhaust pipes and exhaust
pipe clamps.