Exhaust System - GMC 1994 Yukon Owner's Manual

some feature of your vehicle that you can get along without-like the radio
or cigarette lighter-and use
its fuse, if it is of the value you need.
Replace
it as soon as you can. See "Fuses and Circuit Breakers" in the Index for
more information.
Exhaust System
To help prevent damage to your exnaust system, do not continue to drive
your vehicle if you notice:
0
Engine misfiring
Loss of performance
Other unusual operating conditions
Have your engine and exhaust system serviced regularly.
Three- Way Catalytic Converter (gas engines)
Your vehicle's three-way catalytic converter is designed to reduce the
pollutants in your vehicle's exhaust. Use only unleaded fuel in your vehicle.
If you use leaded fuel,
you
could damage your three-way catalytic converter
and other engine components.
Three- Way Cata/ytic Converter (diesel engines)
Your vehicle's three-way catalytic converter is designed to reduce the
particulates in your vehicle's exhaust. If your vehicle's three-way catalytic
converter ever needs to be replaced, it must be replaced with a three-way
catalytic converter intended for use with diesel engines only.
Engine Control Module System (All TBI equipped
vehicles and diesel engine vehicles below
8,500 lbs. GVWR)
Gasoline Engines
This system has an oxygen sensor (02) that helps keep your engine's
air-fuel mixture at a proper level. Use only unleaded fuel in your vehicle. If
you use leaded fuel, you could damage your oxygen sensor (02) and
three-way catalytic converter.
Diesel Vehicles Below 8,5UO LBS. GVWR
This system monitors engine speed and throttle position, It adjusts exhaust
gas recirculation to limit emissions.
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