Mitsubishi Montero (2004+). Manual — part 383

SPECIAL TOOL

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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, catalytic converters
and muffler for damage.

Q: Are the pipes, catalytic converters and muffler

damaged?

YES :

Replace, then go to Step 1 (For the removal

of the catalytic converter, refer to GROUP
17

P.17-76

).

NO :

There is no action to be taken.

SPECIAL TOOL

M1151000600281

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MD998770
Oxygen sensor wrench

MD998770-01 or General
service tool

Removal and installation
of heated oxygen sensor

ON-VEHICLE SERVICE

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INTAKE AND EXHAUST

15-4

ON-VEHICLE SERVICE

INTAKE MANIFOLD TUNING SYSTEM CHECK

M1151001700054

1. Warm up the engine.
2. Disconnect the vacuum hose from the intake manifold tuning

(IMT) actuator, and then connect a vacuum gauge via the
Tee-fitting.

3. Start the engine and verify that a vacuum is applied to the

vacuum gauge.

4. As described in the chart below, vary the engine speed to

inspect the vacuum conditions. During this inspection, verify
that the rod of the IMT actuator is operating.

INTAKE MANIFOLD TUNING SOLENOID CHECK

M1151010000042

1. Disconnect the vacuum hoses from the intake manifold

tuning (IMT) solenoid.
NOTE: When disconnecting the vacuum hose, always make
sure that it can be reconnected at its original position.

2. Disconnect the harness connector.
3. Connect a hand vacuum pump to nipple (B) of the IMT

solenoid.

4. As described in the chart below, check airtightness by

applying a vacuum with voltage applied directly from the
battery to the IMT solenoid, and without applying voltage.

ENGINE SPEED

NORMAL
CONDITION

CONTROL
VALVE

3,750 rpm or less

Vacuum
maintained

Closed

Within 3,750 rpm or less,
engine is suddenly raced

Vacuum not
change

Closed

4,050 rpm or more

Vacuum leaks

Open

AK200808

INTAKE MANIFOLD
TUNING SOLENOID

INTAKE
MANIFOLD
TUNING
ACTUATOR

VACUUM
GAUGE

AC

BATTERY POSITIVE
VOLTAGE

NIPPLE (A)
CONDITION

NORMAL
CONDITION

Applied

Open

Vacuum leaks

Closed

Vacuum
maintained

Not applied

Open

Vacuum leaks

AK102947

B

A

AK102947AB

ON-VEHICLE SERVICE

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INTAKE AND EXHAUST

15-5

5. Measure the resistance between the terminals of the IMT

solenoid.

Standard value: 29

− 35 Ω [at 20°C (68°F)]

6. Replace solenoid resistance is out of specification.

VACUUM TANK CHECK

M1151010100027

1. Disconnect the vacuum hoses from the vacuum tank.

NOTE: When disconnecting the vacuum hose, always make
sure that it can be reconnected at its original position.

2. Connect a hand vacuum pump to nipple "A" of the vacuum

tank, apply a vacuum of 67 kPa (19.7 in. Hg), and verify that
the vacuum is maintained.

3. Disconnect the hand vacuum pump from nipple "A" and

connect it to nipple "B".

4. Block nipple "A" with your finger and apply a vacuum of 67

kPa (19.7 in. Hg) to nipple "B". Release your finger from
nipple "A" and verify that the vacuum leaks immediately.

5. Replace the vacuum tank if it is faulty.

AK102948

AK102949

AK102949AB

A

B

AIR CLEANER

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INTAKE AND EXHAUST

15-6

AIR CLEANER

REMOVAL AND INSTALLATION

M1151002100293

AC204103

3.9 ± 1.0 N·m
35 ± 8 in-lb

9.0 ± 1.0 N·m
80 ± 9 in-lb

9.0 ± 1.0 N·m
80 ± 9 in-lb

5.0 ± 1.0 N·m
44 ± 9 in-lb

1

2

3

4

5

6

7

8

9

10

AB

REMOVAL STEPS

1. INTAKE AIR DUCT A
2. INTAKE AIR DUCT B
3. AIR INTAKE HOSE
4. RESONATOR
5. VOLUME AIRFLOW SENSOR

6. AIR CLEANER HOUSING COVER
7. AIR CLEANER ELEMENT
8. AIR CLEANER HOUSING
9. AIR CLEANER BRACKET
10. UNLOADER VALVE

REMOVAL STEPS (Continued)