1997 SUBARU LEGACY fuel

1. Engine Cooling System
Trouble Possible cause Corrective action
Over-heatinga. Insufficient engine coolantReplenish engine coolant, inspect for leakage, and
repair.
b. Loose timing belt Repair or replace timing belt tensioner.
c. Oil on drive belt Replace.
d. Malfunction of thermostat Replace.
e. Malfunction of engine coolant pump Replace.
f. Clogged engine coolant passage Clean.
g. Improper ignition timingInspect and repair ignition control system.

h. Clogged or leaking radiator Clean or repair, or replace.
i. Improper engine oil in engine coolant Replace engine coolant.
j. Air/fuel mixture ratio too leanInspect and repair fuel injection system.

k. Excessive back pressure in exhaust system Clean or replace.
l. Insufficient clearance between piston and cylinder Adjust or replace.
m. Slipping clutch Repair or replace.
n. Dragging brake Adjust.
o. Improper transmission oil Replace.
p. Defective thermostat Replace.
q. Malfunction of electric fanInspect radiator fan relay, engine coolant temperature
sensor or radiator motor and replace there.
Over-coolinga. Atmospheric temperature extremely low Partly cover radiator front area.
b. Defective thermostat Replace.
Engine coolant
leaks.a. Loosened or damaged connecting units on hoses Repair or replace.
b. Leakage from engine coolant pump Replace.
c. Leakage from engine coolant pipe Repair or replace.
d. Leakage around cylinder head gasket Retighten cylinder head bolts or replace gasket.
e. Damaged or cracked cylinder head and crankcase Repair or replace.
f. Damaged or cracked thermostat case Repair or replace.
g. Leakage from radiator Repair or replace.
Noisea. Defective drive belt Replace.
b. Defective radiator fan Replace.
c. Defective engine coolant pump bearing Replace engine coolant pump.
d. Defective engine coolant pump mechanical seal Replace engine coolant pump.
20
2-5DIAGNOSTICS
1. Engine Cooling System

1Intake manifold gasket LH


2Intake manifold gasket RH


3Fuel injector pipe insulator


4Fuel injector pipe


5O-ring A


6O-ring B


7Fuel injector


8Insulator


9Fuel injector cap


10Plate


11Sealing


12Gasket


13Engine coolant hose B


14Air by-pass hose


15Idle air control solenoid valve


16Engine coolant hose A


17Nipple (AT model)


18Plug


19PCV valve


20Purge control solenoid valve


21Nipple


22BPT (Except 2200 cc MT model)


23BPT holder bracket (Except 2200 cc MT model)


24Back pressure hose (Except 2200 cc MT model)


25EGR vacuum hose A (Except 2200 cc MT model)

26EGR vacuum hose B (Except 2200 cc MT model)


27EGR valve (Except 2200 cc MT model)


28Gasket (Except 2200 cc MT model)


29EGR solenoid valve (Except 2200 cc MT model)


30EGR pipe (Except 2200 cc MT model)


31Pressure sensor


32Pressure sources switching solenoid valve


33Vacuum hose A


34Vacuum hose B


35Vacuum hose C


36Bracket (Except Canada spec. vehicles)


37Bracket (For Canada spec. vehicles)


38Intake manifold
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 3.4±0.5 (0.35±0.05, 2.5±0.4)
T2: 4.9±0.5 (0.5±0.05, 3.6±0.4)
T3: 6.4±0.5 (0.65±0.05, 4.7±0.4)
T4: 16±1.5 (1.6±0.15, 11.6±1.1)
T5: 19±1.5 (1.9±0.15, 13.7±1.1)
T6: 19±2 (1.9±0.2, 13.7±1.4)
T7: 23±3 (2.3±0.3, 16.6±2.2)
T8: 25±2 (2.5±0.2, 18.1±1.4)
T9: 34±2 (3.5±0.2, 25.3±1.4)
3
2-7COMPONENT PARTS
1. Intake Manifold

2. 2500 cc MODEL
B2M1198A

1Intake manifold gasket LH


2Intake manifold gasket RH


3Fuel injector pipe insulator


4Fuel injector pipe


5O-ring A


6O-ring B


7Fuel injector


8Insulator


9Fuel injector cap


10Plate


11Sealing


12Gasket


13Engine coolant hose B


14Air by-pass hose


15Idle air control solenoid valve


16Engine coolant hose A


17Nipple (AT model)


18Plug


19PCV valve

20Purge control solenoid valve


21Nipple


22BPT


23BPT holder bracket


24Back pressure hose


25EGR vacuum hose A


26EGR vacuum pipe


27EGR vacuum hose C


28EGR valve


29Gasket


30EGR vacuum hose B


31EGR solenoid valve


32EGR pipe


33Pressure sensor


34Pressure sources switching solenoid
valve


35Vacuum hose A


36Vacuum hose B


37Vacuum hose C

38Bracket
(Except Canada spec. vehicles)


39Bracket
(For Canada spec. vehicles)


40Collar


41Intake manifold
Tightening torque: N⋅m (kg-m, ft-lb)
T1: 3.4±0.5 (0.35±0.05, 2.5±0.4)
T2: 4.9±0.5 (0.5±0.05, 3.6±0.4)
T3: 6.4±0.5 (0.65±0.05, 4.7±0.4)
T4: 16±1.5 (1.6±0.15, 11.6±1.1)
T5: 19±1.5 (1.9±0.15, 13.7±1.1)
T6: 19±2 (1.9±0.2, 13.7±1.4)
T7: 23±3 (2.3±0.3, 16.6±2.2)
T8: 25±2 (2.5±0.2, 18.1±1.4)
T9: 34±2 (3.5±0.2, 25.3±1.4)
4
2-7COMPONENT PARTS
1. Intake Manifold

B2M1249
10) Remove bolts which install throttle body to intake
manifold.
11) Installation is in the reverse order of removal.
CAUTION:
Always use a new gasket.
Before installing air cleaner upper cover, align holes
with protruding portions of air cleaner lower case, then
secure upper cover to lower case.
Tightening torque:
Throttle body:
22±2 N⋅m (2.2±0.2 kg-m, 15.9±1.4 ft-lb)
Air intake chamber:
4.9±0.5 N⋅m (0.5±0.05 kg-m, 3.6±0.4 ft-lb)
B2M1225A
4. Intake Manifold
A: REMOVAL
1) Release fuel pressure.
2) Disconnect connector from mass air flow sensor.
B2M1226A
3) Loosen clamp which connects air intake duct to air
intake chamber.
4) Remove two clips of air cleaner upper cover.
5) Disconnect blow-by hose from air intake duct.
B2M1227
6) Remove air intake duct and air cleaner upper cover as
a unit.
7) Remove air cleaner element.
10
2-7SERVICE PROCEDURE
3. Throttle Body - 4. Intake Manifold

B2M1249
10) Remove bolts which install throttle body to intake
manifold.
11) Installation is in the reverse order of removal.
CAUTION:
Always use a new gasket.
Before installing air cleaner upper cover, align holes
with protruding portions of air cleaner lower case, then
secure upper cover to lower case.
Tightening torque:
Throttle body:
22±2 N⋅m (2.2±0.2 kg-m, 15.9±1.4 ft-lb)
Air intake chamber:
4.9±0.5 N⋅m (0.5±0.05 kg-m, 3.6±0.4 ft-lb)
B2M1225A
4. Intake Manifold
A: REMOVAL
1) Release fuel pressure.
2) Disconnect connector from mass air flow sensor.
B2M1226A
3) Loosen clamp which connects air intake duct to air
intake chamber.
4) Remove two clips of air cleaner upper cover.
5) Disconnect blow-by hose from air intake duct.
B2M1227
6) Remove air intake duct and air cleaner upper cover as
a unit.
7) Remove air cleaner element.
10
2-7SERVICE PROCEDURE
3. Throttle Body - 4. Intake Manifold

B2M1253A
27) Disconnect connector from oil pressure switch.
G2M0296
28) Disconnect fuel hoses from fuel pipes.
WARNING:
Catch fuel from hoses in a container.
B2M0159
29) Remove bolts which hold intake manifold onto cylinder
heads.
B2M0160
30) Remove intake manifold.
B2M0757A
B: DISASSEMBLY
1) Disconnect engine ground terminal from intake mani-
fold.
15
2-7SERVICE PROCEDURE
4. Intake Manifold

B2M0347A
2) Disconnect connectors from throttle position sensor,
ignition coil, fuel injectors, idle air control solenoid valve,
purge control solenoid valve and EGR solenoid valve.
3) Remove engine harness from intake manifold.


1EGR solenoid valve


2Throttle position sensor


3Idle air control solenoid valve


4Purge control solenoid valve


5Harness band
H2M1247
4) Remove idle air control solenoid valve from intake
manifold.
B2M0157
5) Remove throttle body from intake manifold.
B2M0161B
6) Remove fuel pipes, etc. from intake manifold.


1Pressure regulator


2Fuel pipe ASSY
7) Remove EGR solenoid valve and purge control sole-
noid valve.
B2M0161B
C: ASSEMBLY
1) Install EGR solenoid valve and purge control solenoid
valve.
2) Assemble fuel pipes, etc. to intake manifold.


1Pressure regulator


2Fuel pipe ASSY
16
2-7SERVICE PROCEDURE
4. Intake Manifold

B2M0157
3) Assemble throttle body to intake manifold.
CAUTION:
Replace gasket with a new one.
Tightening torque:
22±2 N⋅m (2.2±0.2 kg-m, 15.9±1.4 ft-lb)
H2M1247
4) Install idle air control solenoid valve to intake manifold.
CAUTION:
Replace gasket with a new one.
Tightening torque:
6.4±0.5 N⋅m (0.65±0.05 kg-m, 4.7±0.4 ft-lb)
B2M0347A
5) Install engine harness onto intake manifold.
6) Connect connectors to throttle position sensor, ignition
coil, fuel injectors, idle air control solenoid valve, purge
control solenoid valve and EGR solenoid valve.


1EGR solenoid valve


2Throttle position sensor


3Idle air control solenoid valve


4Purge control solenoid valve


5Harness band
B2M0757A
7) Connect engine ground terminal to intake manifold.
B2M0159
D: INSTALLATION
1) Install intake manifold onto cylinder heads.
CAUTION:
Always use new gaskets.
Tightening torque:
25±2 N⋅m (2.5±0.2 kg-m, 18.1±1.4 ft-lb)
17
2-7SERVICE PROCEDURE
4. Intake Manifold