Chrysler Dodge Caravan 2002 Manual page 1425

11 - 2 EXHAUST SYSTEM
EXHAUST SYSTEM (Continued)
OPERATION
The exhaust system contains, quiets, and cleans
the exhaust gases generated by the engine.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - EXCESSIVE
EXHAUST SYSTEM NOISE
CONDITION
EXCESSIVE EXHAUST NOISE
(UNDER HOOD)
EXCESSIVE EXHAUST NOISE
DIAGNOSIS AND TESTING - EXHAUST SYSTEM
RESTRICTION CHECK
Exhaust system restriction can be checked by mea-
suring back pressure using the DRB III
module pressure tester.
POSSIBLE CAUSES
1. Exhaust manifold cracked or
broken.
2. Manifold to cylinder head leak.
3. EGR Valve to manifold gasket
leakage.
4. EGR Valve to EGR tube gasket
leakage.
5. EGR tube to manifold tube
leakage.
6. Exhaust flex-joint to manifold
leak.
7. Exhaust flex-joint.
8. Pipe and shell noise from front
exhaust pipe.
1. Leak at exhaust pipe joints.
2. Burned or rusted out muffler
assembly or exhaust pipe.
3. Burned or rusted out resonator.
4. Restriction in exhaust system.
5. Converter material in muffler.
WARNING: THE NORMAL OPERATING TEMPERA-
TURE OF THE EXHAUST SYSTEM IS VERY HIGH.
THEREFORE, NEVER WORK AROUND OR ATTEMPT
TO SERVICE ANY PART OF THE EXHAUST SYSTEM
and PEP
UNTIL IT IS COOLED. SPECIAL CARE SHOULD BE
TAKEN WHEN WORKING NEAR THE CATALYTIC
CONVERTER. THE TEMPERATURE OF THE CON-
VERTER RISES TO A HIGH LEVEL AFTER A SHORT
PERIOD OF ENGINE OPERATION TIME.
CORRECTION
1. Replace manifold.
2. Tighten manifold and/or replace
gasket.
3. Tighten fasteners or replace
gasket.
4. Tighten fasteners or replace
gasket.
5. Tighten tube nut.
6. Tighten joint fasteners and/or
replace gasket.
7. Replace catalytic converter
assembly.
8. Characteristic of single wall pipe.
1. Tighten clamps at leaking joints.
2. Replace muffler resonator tailpipe
assembly or exhaust pipe with
catalytic converter assembly.
3. Replace muffler resonator tailpipe
assembly.
4. Perform Exhaust System
Restriction Check. Replace
component as necessary.
5. Replace muffler and converter
assemblies. Check fuel injection and
ignition systems for proper
operation.
RS