Mitsubishi 380. Manual — part 240
SPECIFICATIONS
ENGINE COOLING
14-44
15-1
GROUP 15
INTAKE AND
EXHAUST
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .
INTAKE AND EXHAUST DIAGNOSIS
INTRODUCTION. . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING STRATEGY . . . . . .
SYMPTOM CHART. . . . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . . . .
AIR CLEANER . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INTAKE MANIFOLD PLENUM . . . . .
REMOVAL AND INSTALLATION . . . . . . .
INTAKE MANIFOLD . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
EXHAUST MANIFOLD . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
EXHAUST PIPE AND MAIN MUFFLER
REMOVAL AND INSTALLATION . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING SPECIFICATIONS
SERVICE SPECIFICATION . . . . . . . . . . . .
GENERAL DESCRIPTION
INTAKE AND EXHAUST
15-2
GENERAL DESCRIPTION
M1151000100446
The exhaust pipe is divided into four parts.
INTAKE AND EXHAUST DIAGNOSIS
INTRODUCTION
M1151006900321
Intake leaks usually create driveability issues that
are not obviously related to the intake system.
Exhaust leaks or abnormal noise is caused by
cracks, gaskets and fittings, or by exhaust pipe or
muffler damage due to impacts during travel. The
exhaust leaks from these sections and causes the
exhaust noise to increase. There may be cases
when the system contacts the body and vibration
noise is generated.
TROUBLESHOOTING STRATEGY
M1151007000321
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find an
intake or exhaust system fault.
1. Gather information from the customer.
2. Verify that the condition described by the
customer exists.
3. Find the malfunction by following the Symptom
Chart.
4. Verify malfunction is eliminated.
SYMPTOM CHART
M1151007100328
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Exhaust Leakage
DIAGNOSIS
STEP 1. Start the engine. Have an assistant stay
in the driver’s seat. Raise the vehicle on a hoist.
Have the assistant rev the engine while
searching for exhaust leaks.
Q: Is the exhaust leaking?
YES :
Go to Step 2.
NO :
The procedure is complete.
STEP 2. Check the gasket for cracks, damage.
Q: Is the gasket damaged?
YES :
Replace the gasket, then go Step 1.
NO :
Go to Step 3.
STEP 3. Check for loose coupling sections.
Q: Are there any loose each sections?
YES :
Tighten, then go to Step 1.
NO :
There is no action to be taken.
SYMPTOM
INSPECTION PROCEDURE
REFERENCE PAGE
Exhaust Leakage
1
Abnormal Noise
2
SPECIAL TOOLS
INTAKE AND EXHAUST
15-3
INSPECTION PROCEDURE 2: Abnormal Noise
DIAGNOSIS
STEP 1. Start the engine. Have an assistant stay
in the drivers seat. Raise the vehicle on a hoist.
Have the assistant rev the engine while
searching for exhaust leaks.
Q: Is any abnormal noise generated?
YES :
Go to Step 2.
NO :
The procedure is complete.
STEP 2. Check for missing parts in the muffler.
Tap the muffler lightly to check for loose baffles,
etc.
Q: Are there any missing parts in the muffler?
YES :
Replace, then go to Step 1.
NO :
Go to Step 3.
STEP 3. Check the hanger for cracks.
Q: Is the hanger cracked?
YES :
Replace, then go to Step 1.
NO :
Go to Step 4.
STEP 4. Check for interference of the pipes and
muffler with the body.
Q: Are the pipes and muffler interfering with the
body?
YES :
Repair, then go to Step 1.
NO :
Go to Step 5.
STEP 5. Check the heat protectors.
Q: Are any heat protectors loose or damaged?
YES :
Tighten or replace, then go to Step 1.
NO :
Go to Step 6.
STEP 6. Check the pipes and muffler for damage.
Q: Are the pipes and muffler damaged?
YES :
Replace, then go to Step 1.
NO :
There is no action to be taken.
SPECIAL TOOLS
M1151000600429
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MD998412
Guide
MD998412
Installation of intake
manifold plenum
MB991953
Oxygen sensor wrench
-
Removal and installation
of heated oxygen sensor
MD998770
Oxygen sensor wrench
MD998770-01 or General
service tool
Removal and installation
of heated oxygen sensor
B991953
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