1998 MITSUBISHI LANCER EVOLUTION IV fuel pressure

ENGINE – Engine Adjustments11-7
4. LASH ADJUSTER REPLACEMENT
Refer to (4) of the preceding paragraph.
5. IGNITION TIMING CHECK
Check that ignition timing is at the standard value.
Standard value: approx. 5
BTDC
NOTE
Ignition timing is variable within about ±7
, even under normal
operating.
6. IDLE SPEED CHECK AND IDLE MIXTURE
CHECK
(1) Run the engine at 2,000 to 3,000 r/min for 2 minutes.
(2) Check the CO and HC contents at idle.
Standard value
CO contents: 0.6% or less
HC contents: 300 ppm or less
7. COMPRESSION PRESSURE CHECK
(1) Before inspection, check that the engine oil, starter and
battery are normal. In addition, set the vehicle to the
pre-inspection condition.
(2) Remove all of the spark plugs.
(3) Disconnect the crank angle sensor connector.
NOTE
Doing this will prevent the engine-ECU from carrying out
ignition and fuel injection.
(4) Cover the spark plug hole with a shop towel etc., and
after the engine has been cranked, check that no foreign
material is adhering to the shop towel.
Caution
(1) Keep away from the spark plug hole when
cranking.
(2) If compression is measured with water, oil, fuel,
etc., that has come from cracks inside the cylinder,
these materials will become heated and will gush
out from the spark plug hole, which is dangerous.
Crank angle
sensor connector

ENGINE – Engine Adjustments11-8
(5) Set compression gauge to one of the spark plug holes.
(6) Crank the engine with the throttle valve fully open and
measure the compression pressure.
Standard value
(at engine speed of 250 r/min): 11.5 kg/cm
2
Limit (at engine speed of 250 r/min): 9.7 kg/cm2
(7) Measure the compression pressure for all the cylinders,
and check that the pressure differences of the cylinders
are below the limit.
Limit: Max. 1.0 kg/cm
2
(8) If there is a cylinder with compression or a compression
difference that is outside the limit, pour a small amount
of engine oil through the spark plug hole, and repeat
the operations in steps (5) through (7).
a. If the compression increases after oil is added, the
cause of the malfunction is a worn or damaged piston
ring and/or cylinder inner surface.
b. If the compression does not rise after oil is added,
the cause is a burnt or defective valve seat, or pressure
is leaking from the gasket.
(9) Connect the crank angle sensor connector.
(10)Install the spark plugs.
(11) Install the ignition coil and connect the ignition coil
connector.
(12)Erase the diagnosis codes by keeping the battery minus
(–) cable disconnected for more than 10 seconds.
NOTE
This will erase the diagnosis code resulting from the crank
angle sensor connector being disconnected.
8. MANIFOLD VACUUM CHECK
(1) Before inspection, set the vehicle to the pre-inspection
condition.
(2) Connect a tachometer connector.
(3) Attach a three-way union to the vacuum hose between
the fuel pressure regulator valve and the intake manifold,
and connect a vacuum gauge.
(4) Start the engine and check that idle speed is within
standard value.
Standard value: 850 ± 50 r/min
5. Check the manifold vacuum at idling.
Limit: Min. 55 kPa {410 mmHg}
Compression gauge
Vacuum gauge
Fuel pressure
regulator valve

ENGINE – Cylinder Head Gasket11-17
CYLINDER HEAD GASKET
REMOVAL AND INSTALLATION
Pre-removal Operation
(1) Fuel Discharge Prevention
(2) Engine Oil Removal
(3) Strut Tower Bar Removal
(4) Timing Belt Removal (Refer to P.11-21.)
(5) Thermostat Case Assembly Removal
(Refer to GROUP 14 – Water Hose Pipe.)
(6) Front Exhaust Pipe Removal (Refer to GROUP 15.)Post-installation Operation
(1) Front Exhaust Pipe Installation
(Refer to GROUP 15.)
(2) Thermostat Case Assembly Installation
(Refer to GROUP 14 – Water Hose Pipe.)
(3) Engine Oil Filling
(4) Timing Belt Installation (Refer to P.11-21.)
(5) Strut Tower Bar Installation
(6) Accelerator Cable Adjustment
O-ringDelivery pipe
Engine oil
12 – 15 {1.2 – 1.5}
5
9 {0.9}5 {0.5} 3 {0.3} 10 {1.0}
19
14
153
16
18
10
17
8
9
8
11
8
7
201
2
Unit: Nm {kgf
m}
18
6
3
13
12 4
Removal steps
1. Center cover
2. Accelerator cable connection
3. Ignition coil connector
4. Ignition coil
5. Crank angle sensor connector
6. Crank angle sensor bracket con-
nection
7. Brake booster vacuum hose con-
nection
8. Vacuum hose connection
9. TPS connector
10. ISC motor connector11. Water hose connection
12. Oxygen sensor connector
13. Injector connector
14. Cam position sensor connector
15. Coolant temperature sensor con-
nector
16. Water temperature gauge unit con-
nector
17. Control harness
D18. Fuel pipe pressure hose connection
19. Fuel return hose connection
20. Oil level gauge guide assembly

ENGINE – Cylinder Head Gasket11-20
(3) Tighten the bolts by the following procedure.
StepOperation
1Tighten to 78 Nm {8.0 kgf
m} in the order shown in the
illustration.
2Fully loosen in the reverse order of that shown in the
illustration.
3Tighten to 20 Nm {2.0 kgf
m} in the order shown in the
illustration.
4Mark the head of the cylinder head bolt and cylinder head
by paint, then tighten 90
of a turn in the order shown in
the illustration.
5Tighten 90
of a turn in the order shown in the illustration.
Check that the painted mark of the head bolt is lined up
with that of the cylinder head.
Caution
(1) Always make a tightening angle just 90
. If it is less
than 90
, the head bolt will be loosened.
(2) If it is more than 90
, remove the head bolt and repeat
the procedure from step 1.
COIL RETURN PIPE GASKET INSTALLATION
Install the gasket with the printed portion toward the oil pan.
DHIGH-PRESSURE FUEL HOSE INSTALLATION
(1) Apply a small amount of new engine oil to the O-ring,
then fit the O-ring in the delivery pipe.
Caution
Do not let any engine oil get into the delivery pipe.
(2) Check that the high pressure hose turns smoothly.
If the hose does not turn smoothly, the O-ring is probably
being clamped. Disconnect the high-pressure fuel hose
and check the O-ring for damage. After this, re-install
the hose to the delivery pipe and check that the hose
turns smoothly.
(3) Tighten the mounting bolts to the specification.
Intake sideMB991654
Exhaust sideFront of engine
Step 4
90

Painted markStep 5
90

Painted mark
GasketPrinted portion

ENGINE – Engine Assembly 11- 32
ENGINE ASSEMBLY
REMOVAL AND INSTALLATION
Pre-removal Operation
(1) Fuel Discharge Prevention
(2) Hood Removal
(3) Strut Tower Bar Removal
(4) Air Hose C Removal
(Refer to GROUP 15 – Intercooler.)
(5) Radiator Assembly Removal (Refer to GROUP 14.)
(6) Under Cover Removal
(7) Front Exhaust Pipe Removal (Refer to GROUP 15.)Post-installation Operation
(1) Front Exhaust Pipe Installation
(Refer to GROUP 15.)
(2) Under Cover Installation
(3) Radiator Assembly Installation (Refer to GROUP 14.)
(4) Accelerator Cable Adjustment
(5) Air Hose C Installation (Refer to GROUP 15 – Intercooler.)
(6) Strut Tower Bar Installation
(7) Hood Installation
O-ring Delivery pipe
1
2
3
4
5
6
7 8
9
10
11
18 12
Engine oil
5 {0.5}
Unit: Nm {kgf

m}
10 – 12
{1.0 – 1.2}
17 1614 13
10
– 12
{1.0 – 1.2}
15
3 {0.3}
17
8
Removal steps1. Center cover
2. Accelerator cable
3. Brake booster vacuum hose connection
4. Vacuum hose connection
5. Throttle position sensor connector
6. Idle speed control motor connector
7. Heater hose connection
8. Ignition coil connector
9. Crank angle sensor connector
10. Oxygen sensor connector 11. Injector connector
12. Cam position sensor connector
13. Coolant temperature sensor con-
nector
14. Coolant temperature gauge unit connector
15. Vacuum pipe/hose assembly
16. Control harness
 C 17. High-pressure fuel hose connection
18. Fuel return hose connection

ENGINE – Engine Assembly11-3 5
E ENGINE ASSEMBLY REMOVAL
After checking that all cables, hoses and harness connectors,
etc., are disconnected from the engine, lift the chain block
slowly to remove the engine assembly upward from the engine
compartment.
INSTALLATION SERVICE POINTS
 A ENGINE ASSEMBLY INSTALLATION
Install the engine assembly, checking that the cables, hoses,
and harness connectors are not clamped.
 B ENGINE MOUNT BRACKET INSTALLATION
(1) Place a garage jack against the engine oil pan with a piece of wood in between, and install the engine mount
bracket while adjusting the position of the engine.
(2) Support the engine with the garage jack.
(3) Remove the chain block and support the engine assembly
with the special tools.
 C HIGH-PRESSURE FUEL HOSE INSTALLATION
(1) Apply a small amount of new engine oil to the O-ring, then fit the O-ring in the delivery pipe.
Caution
Do not let any engine oil get into the delivery pipe.
(2) Check that the high pressure hose turns smoothly. If the hose does not turn smoothly, the O-ring is probably
being clamped. Disconnect the high-pressure fuel hose
and check the O-ring for damage. After this, re-install
the hose to the delivery pipe and check that the hose
turns smoothly.
(3) Tighten the mounting bolt to the specification.
MZ203826 or MZ203827
MB991453

13-1
FUEL
CONTENTS
MULTIPOINT INJECTION (MPI) 2. . . . . . .
GENERAL INFORMATION 2. . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS 3. . . . . . . . . . . . . .
SEALANT 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS 4. . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 6. . . . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 30. . . . . . . . . . . . . . . .
1. Idle Position Switch and Throttle Position
Sensor (TPS) Adjustment 30. . . . . . . . . . . . .
2. Fixed SAS Adjustment 30. . . . . . . . . . . . . . . .
3. Basic Idle Speed Adjustment 30. . . . . . . . . . 4. Fuel Pressure Measurement 30. . . . . . . . . . .
5. MPI System Components Layout 31. . . . . .
6. Intake Air Temperature Sensor Check 32. .
7. Engine Coolant Temperature
Sensor Check 32. . . . . . . . . . . . . . . . . . . . . . . .
8. Oxygen Sensor Check 32. . . . . . . . . . . . . . . .
9. Injector Check 34. . . . . . . . . . . . . . . . . . . . . . .
10. Resistor Check 34. . . . . . . . . . . . . . . . . . . . . . .
11. Fuel Pump Relay No.2 Check 35. . . . . . . . .
12. Fuel Pump Resistor Check 35. . . . . . . . . . . . INJECTOR 36. . . . . . . . . . . . . . . . . . . . . . . . . . . .
THROTTLE BODY 37. . . . . . . . . . . . . . . . . . . . .

MPI – General Information13-2
MULTIPOINT INJECTION (MPI)
GENERAL INFORMATION
OMPI System Diagram

1 Injector

2 ISC servo

3 Fuel pressure control valve

4 Waste gate solenoid valve

5 Secondary air control solenoid valve
Control relay
Fuel pump relay
A/C relay
Ignition coil
Exhaust temperature warning lamp
Engine warning lamp
Diagnosis output
Alternator G terminal
Fan motor relay
Tachometer
Fuel pump relay No.2 1 Oxygen sensor
2 Air flow sensor
3 Intake air temperature sensor
4 Throttle position sensor
5 Idle switch
6 Camshaft position sensor
7 Crank angle sensor
8 Barometric pressure sensor
9 High temperature sensor
10 Engine coolant temperature sensor
11 Detonation sensor
Power supply voltage
Ignition switch-IG
Ignition switch-ST
Vehicle speed sensor
A/C switch
Power steering fluid pressure switch
Alternator FR signalEngine ECU
1 Oxygen sensor
2 Air flow sensor3
Intake air tem-
perature sensor
4,
5
6 Camshaft position
sensor
7 Crank angle sensor 8 Barometric
pressure sensor
9 High temperature
sensor 10 Coolant temperature sensor
11 Detonation sensor
1 Injector
2 ISC servo

3 Fuel pressure
control valve

4 Waste gate
solenoid valve
5 Secondary air
control solenoid
valveCanister
Check valveFrom
fuel
tank
Throttle position
sensor (with a
built-in
idle
switch)
Secondary
air valve
AirTo fuel
tankFuel
pressure
regulatorFrom
fuel
pump
Waste gate
actuator
Catalytic converter
Given above is the MPI system diagram for EVOLUTION-IV. The MPI system for EVOLUTION-V is different
from this in the following point;
Oxygen sensor with a heater is adopted.
The diagnosis connector power supply circuit is different.
The high temperature sensor is no longer used.