Jeep Cherokee (XJ): Description and operation
DESCRIPTION The basic exhaust system consists of exhaust manifold(
s), exhaust pipe with oxygen sensors, catalytic
converter(s), heat shield(s), muffler and tailpipe
(Fig. 1) (Fig. 2) (Fig. 3)
1 - NUT
1 - NUT
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Fig. 3 Exhaust System-Typical 1 - STUD DESCRIPTION California emissions vehicles incorporate two mini
catalytic converters into the exhaust system. These
catalytic converters are made of stainless steel
designed to operate at extremely high temperatures.
The stainless steel catalytic converter body is
designed to last the life of the vehicle. Excessive heat
can result in bulging or other distortion, but excessive
heat will not be the fault of the converter. If
unburned fuel enters the converter, overheating may
occur. If a converter is heat-damaged, correct the
cause of the damage at the same time the converter
is replaced. Also, inspect all other components of the
exhaust system for heat damage.
Unleaded gasoline must be used to avoid contaminating
the catalyst core.
1 - O2 SENSOR Federal emission vehicles use only one catalytic
converter, However, California emission vehicles
incorporate two mini catalytic converters located
after the exhaust manifolds and before the inline catalytic
converter (Fig. 4). DESCRIPTION Both the 2.5L and 4.0L engines use a galvanized
steel muffler to control exhaust noise levels and
exhaust back pressure.
1 - MUFFLER DESCRIPTION The tail pipe is also made of galvanized steel. OPERATION The tailpipe channels the exhaust out of the muffler
and out from under the vehicle to control noise
and prevent exhaust gas fumes from entering the
passenger compartment.
1 - TAILPIPEExhaust system
Fig. 1 Exhaust Pipe-2.5L
2 - TRANSMISSION SUPPORT
3 - MINI CATALYTIC CONVERTER
4 - EXHAUST PIPE
5 - EXHAUST MANIFOLD
Fig. 2 Exhaust Pipe-4.0L
2 - EXHAUST MANIFOLD
3 - TRANSMISSION SUPPORT
4 - EXHAUST PIPE
5 - MINI CATALYTIC CONVERTER
6 - BOLT
2 - TAIL PIPE HANGER
3 - CLAMP
4 - ISOLATOR
5 - BOLT
6 - TAIL PIPE HANGER
7 - NUT
8 - MUFFLER
9 - CLAMP
10 - CATALYTIC CONVERTER
11 - HEAT SHIELDCatalytic converters
Fig. 4 4.0L Catalytic Converter and O2 Sensor Configuration-(California
Emissions only)
2 - O2 SENSOR
3 - O2 SENSOR
4 - O2 SENSOR
5 - O2 SENSOR
6 - O2 SENSORMuffler
Fig. 5 Muffler-TypicalTailpipe
Fig. 6 Tailpipe-Typical
Other materials:
Fuel requirements
2.4L and 3.2L Engines
This engine is designed to meet
all emissions
regulations and provide optimum
fuel economy and performance when using
high quality unleaded "Regular" gasoline
having a posted octane number of 87
as specified by the (R+M)/2 method. The use of higher
octane "Premium" gas ...