1998 MITSUBISHI LANCER EVOLUTION IV service

INTAKE AND EXHAUST – On-vehicle Service15-4
3. WASTEGATE ACTUATOR CHECK
(1) Connect a hand pump (pressure type) to the nipple.
(2) Gradually increase the pressure being applied to check
for the pressure at which the wastegate actuator rod starts
moving (approx. 1 mm stroke).
Standard value: Approx. 100 kPa {1.02 kg/cm
2}
Caution
Do not apply a pressure more than 120 kPa {1.23
kg/cm
2} to prevent the diaphragm from being
damaged.
(3) If the pressure drastically deviates from the standard
value, check the actuator or wastegate valve and, if
necessary, replace the actuator or turbocharger assembly.
4. WASTEGATE SOLENOID VALVE CHECK
4-1 OPERATION CHECK
(1) Connect a hand vacuum pump to nipple A of the solenoid
valve.
(2) Using jumper wires, connect the solenoid valve terminal
to battery terminals.
(3) Disconnecting and reconnecting the jumper wire on the
(–) terminal side, apply vacuum to check for airtightness.
Jumper wireNipple B conditionNormally
ConnectedOpenVacuum leaks.
PluggedVacuum retained.
DisconnectedOpenVacuum retained.
4-2 COIL RESISTANCE CHECK
Measure the resistance across solenoid valve terminals.
Standard value: 62 – 74 Ω (at 20
C)
5. AIR BYPASS VALVE CHECK
(1) Remove the air bypass valve.
(2) Connect a hand vacuum pump to the air bypass valve
nipple.
(3) Apply a vacuum of approx. 45 kPa {340 mmHg} and
check that the valve is airtight.
(4) Increase the vacuum and check for valve operation.
VacuumValve operation
Approx. 53 kPa {400 mmHg}Starts moving

INTAKE AND EXHAUST – On-vehicle Service15-5
6. SECONDARY AIR CONTROL SYSTEM
CHECK
(1) Start the engine and let it run at idle speed.
(2) Short-circuit the no. 6 terminal of the engine ECU
connector using a jumper wire and check at this time
that the secondary air valve lifts.
At this time, the engine ECU connector should be
connected.
7. SECONDARY AIR CONTROL SOLENOID
VALVE CHECK
7-1 OPERATION CHECK
(1) Disconnect the vacuum hose (white stripe, yellow stripe)
from the solenoid valve.
(2) Disconnect the harness connector.
(3) Connect a hand vacuum pump to nipple A of the solenoid
valve.
(4) Using jumper wires, connect the solenoid valve terminal
to battery terminals.
(5) Disconnecting and reconnecting the jumper wire on the
(–) terminal side, apply vacuum to check for airtightness.
Jumper wireNipple B conditionNormally
ConnectedOpenVacuum leaks.
PluggedVacuum retained.
DisconnectedOpenVacuum leaks.
7-2 COIL RESISTANCE CHECK
Measure the resistance across solenoid valve terminals.
Standard value: 28 – 36 Ω (at 20
C)
Secondary air control
solenoid valve
Battery

INTAKE AND EXHAUST – On-vehicle Service15-6
8. SECONDARY AIR VALVE CHECK
(1) Remove the secondary air valve.
(2) Connect a hand vacuum pump to the secondary air valve
nipple.
(3) Apply a vacuum of 67 kPa {500 mmHg} and check that
the vacuum is retained.
(4) Blow air from side (A) and side (B) of the secondary
air valve to check for air passage.
VacuumAir blowing directionAir passage
0 kPa
(vacuum not applied)(A) → (B)No
40 kPa {300 mmHg}
or more
(A) → (B)Ye s
or more
(B) → (A)No
9. VACUUM TANK CHECK
(1) Connect a hand vacuum pump to nipple A of the vacuum
tank. Applying a vacuum of 67 kPa {500 mmHg}, check
that the vacuum is retained.
(2) Connect a hand vacuum pump to nipple B of the vacuum
tank.
(3) Apply a vacuum of 67 kPa {500 mmHg] with nipple A
plugged with a finger. Check that the vacuum leaks when
the finger is then released.
A
B
A
B

INTAKE AND EXHAUST – Intercooler15-7
INTERCOOLER
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operation
Front Bumper Removal and Installation
(Refer to GROUP 51.)
16
Unit: Nm {kgf
m}
10 – 13
{1.0 – 1.3} 6 {0.6}
10 – 13
{1.0 – 1.3} 10 – 13
{1.0 – 1.3}
10 – 13
{1.0 – 1.3}
11 1 0
1213
15
1454 2
36 7
9 8
Hose clamp
tightening torque
1
Removal steps
1. Vacuum hose connection
2. Air bypass valve assembly
3. Breather hose connection
4. Vacuum hose connection
5. Air intake hose assembly
A6. Air bypass hose
7. Air hose connection
A8. Air hose DA9. Air hose C
A10. Air hose A
11. Air pipe A
A12. Air hose B
13. Intercooler assembly
A14. Air hose B
15. Air pipe B
16. Air pipe bracket
INSTALLATION SERVICE POINT
AAIR HOSE B / AIR HOSE A / AIR HOSE C / AIR
HOSE D / AIR BYPASS HOSE INSTALLATION
Align the alignment mark (white paint) on each hose with
the protrusion on each pipe.

INTAKE AND EXHAUST – Air Control Valve15-8
AIR CONTROL VALVE
REMOVAL AND INSTALLATION
1
Unit: Nm {kgf
m}
22 {2.2}
35 {3.6}49 {5.0}
24 {2.4}4 {0.4}10 – 12 {1.0 – 1.2}
4 {0.4}10 – 12
{1.0 – 1.2}
24 {2.4}
22 {2.2}
2
3
8 7 64 5
12 – 15 {1.2 – 1.5}
Removal steps
1. Control harness connection
2. Vacuum pipe hose assembly
3. Air pipe assembly
A4. Gasket5. Air hose
6. Air control valve
7. Engine hanger
8. Air control valve bracket
INSTALLATION SERVICE POINT
AGASKET INSTALLATION
Install the gasket so that its protrusion is located as shown.Protrusion

INTAKE AND EXHAUST – Intake Manifold15-10
REMOVAL SERVICE POINT
ADELIVERY PIPE, INJECTOR AND PRESSURE
REGULATOR REMOVAL
Remove the delivery pipe with the injectors and pressure
regulator attached to it.
Caution
Care must be taken, when removing the delivery pipe,
not to drop the injector.
INSTALLATION SERVICE POINT
AHIGH-PRESSURE FUEL HOSE INSTALLATION
(1) When connecting the high-pressure fuel hose to the
delivery pipe, apply a small amount of new engine oil
to the O-ring and then insert the high-pressure fuel hose,
being careful not to damage the O-ring.
Caution
Be careful not to let any engine oil get into the delivery
pipe.
(2) Check to be sure that the high pressure hose turns
smoothly.
If it does not turn smoothly, the O-ring may be trapped.
Remove the high-pressure fuel hose to check for damaged
O-ring and then re-insert it into the delivery pipe and
check once again.
(3) Tighten the mounting bolts to the specification.
INSPECTION
INTAKE MANIFOLD CHECK
(1) Check the intake manifold for damage or cracking and
replace it if defective.
(2) Using a straight edge and feeler gauge, check for distortion
of the cylinder head installation surface.
Standard value: 0.15 mm or less
Limit: 0.2 mm
High-pressure
fuel hoseDelivery pipe
O-ring

INTAKE AND EXHAUST – Exhaust Manifold and Turbocharger15-12
REMOVAL SERVICE POINTS
AOXYGEN SENSOR REMOVAL
BOIL PIPE REMOVAL
Caution
After the oil pipe has been removed, ensure that no foreign
matter will get into the oil passage holes in turbocharger.
INSTALLATION SERVICE POINTS
ATURBOCHARGER INSTALLATION
(1) Clean the connections between oil pipe, oil return pipe,
and water pipe.
Caution
Ensure that no foreign matter will get into the
turbocharger.
(2) Through the oil pipe mounting hole in the turbocharger,
add fresh engine oil.
BAIR OUTLET FITTING GASKET INSTALLATION
Install the gasket so that its tab is located as shown.
MB998770
Turbocharger
Ta b

16-1
ENGINE
ELECTRICAL
CONTENTS
CHARGING SYSTEM 2. . . . . . . . . . . . . . . .
ALTERNATOR 2. . . . . . . . . . . . . . . . . . . . . . . . . . .
IGNITION SYSTEM 4. . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 4. . . . . . . . . . . . . . . . . . .
1. Ignition Coil with Built-in Power Transistor
Check 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Spark Plug Check, Cleaning, and
Replacement 4. . . . . . . . . . . . . . . . . . . . . . . . . .
CAMSHAFT POSITION SENSOR AND
CRANK ANGLE SENSOR
5 . . . . . . . . . . . . .