1999 SUBARU LEGACY heat

TROUBLE PROBLEM PARTS, ETC. POSSIBLE CAUSE RANK
4) Engine stalls after initial
combustion.IFuel injection system A
IIntake systemILoosened or cracked intake duct B
ILoosened or cracked PCV hose C
ILoosened or cracked vacuum hose C
IDefective intake manifold gasket B
IDefective throttle body gasket B
IDirty air cleaner element C
IFuel lineIClogged fuel line C
ILack of or insufficient fuel B
IBeltIDefective B
IDefective timing B
ICompressionIIncorrect valve clearance C
ILoosened spark plugs or defective gasket C
ILoosened cylinder head bolts or defective gasket C
IImproper valve seating C
IDefective valve stem C
IWorn or broken valve spring B
IWorn or stuck piston rings, cylinder and piston C
IIncorrect valve timing B
IImproper engine oil (low viscosity) B
2. Rough idle and engine
stallIFuel injection system A
IIntake systemILoosened or cracked intake duct A
ILoosened or cracked PCV hose A
ILoosened or cracked vacuum hose A
IDefective intake manifold gasket B
IDefective throttle body gasket B
IDefective PCV valve C
ILoosened oil filler cap B
IDirty air cleaner element C
IFuel lineIDefective fuel pump and relay C
IClogged fuel line C
ILack of/or insufficient fuel B
IBeltIDefective timing C
ICompressionIIncorrect valve clearance B
ILoosened spark plugs or defective gasket B
ILoosened cylinder head bolts or defective gasket B
IImproper valve seating B
IDefective valve stem C
IWorn or broken valve spring B
IWorn or stuck piston rings, cylinder and piston B
IIncorrect valve timing A
IImproper engine oil (low viscosity) B
ILubrication systemIIncorrect oil pressure B
IDefective rocker cover gasket C
ICooling systemIOverheating C
IOthersIMalfunction of evaporative emission control system A
IStuck or damaged throttle valve B
IAccelerator cable out of adjustment C
72
2-3b[K100]DIAGNOSTICS
1. Engine Trouble in General

TROUBLE PROBLEM PARTS, ETC. POSSIBLE CAUSE RANK
3. Low output, hesitation
and poor accelerationIFuel injection system A
IIntake systemILoosened or cracked intake duct A
ILoosened or cracked PCV hose A
ILoosened or cracked vacuum hose B
IDefective intake manifold gasket B
IDefective throttle body gasket B
IDefective PCV valve B
ILoosened oil filler cap B
IDirty air cleaner element A
IFuel lineIDefective fuel pump and relay B
IClogged fuel line B
ILack of/or insufficient fuel C
IBeltIDefective timing B
ICompressionIIncorrect valve clearance B
ILoosened spark plugs or defective gasket B
ILoosened cylinder head bolts or defective gasket B
IImproper valve seating B
IDefective valve stem C
IWorn or broken valve spring B
IWorn or stuck piston rings, cylinder and piston C
IIncorrect valve timing A
IImproper engine oil (low viscosity) B
ILubrication systemIIncorrect oil pressure B
ICooling systemIOverheating C
IOver cooling C
IOthersIMalfunction of evaporative emission control system A
4. SurgingIFuel injection system A
IIntake systemILoosened or cracked intake duct A
ILoosened or cracked PCV hose A
ILoosened or cracked vacuum hose A
IDefective intake manifold gasket B
IDefective throttle body gasket B
IDefective PCV valve B
ILoosened oil filler cap B
IDirty air cleaner element B
IFuel lineIDefective fuel pump and relay B
IClogged fuel line B
ILack of/or insufficient fuel C
IBeltIDefective timing B
ICompressionIIncorrect valve clearance B
ILoosened spark plugs or defective gasket C
ILoosened cylinder head bolts or defective gasket C
IImproper valve seating C
IDefective valve stem C
IWorn or broken valve spring C
IWorn or stuck piston rings, cylinder and piston C
IIncorrect valve timing A
IImproper engine oil (low viscosity) B
ICooling systemIOverheating B
IOthersIMalfunction of evaporative emission control system C
73
[K100]2-3bDIAGNOSTICS
1. Engine Trouble in General

TROUBLE PROBLEM PARTS, ETC. POSSIBLE CAUSE RANK
5. Engine does not return
to idle.IFuel injection system A
IIntake systemILoosened or cracked vacuum hose A
IOthersIStuck or damaged throttle valve A
IAccelerator cable out of adjustment B
6. Dieseling (Run-on)IFuel injection system A
ICooling systemIOverheating B
IOthersIAccelerator cable out of adjustment B
7. After burning in exhaust
systemIFuel injection system A
IIntake systemILoosened or cracked intake duct C
ILoosened or cracked PCV hose C
ILoosened or cracked vacuum hose B
IDefective PCV valve B
ILoosened oil filler cap C
IBeltIDefective timing B
ICompressionIIncorrect valve clearance B
ILoosened spark plugs or defective gasket C
ILoosened cylinder head bolts or defective gasket C
IImproper valve seating B
IDefective valve stem C
IWorn or broken valve spring C
IWorn or stuck piston rings, cylinder and piston C
IIncorrect valve timing A
ILubrication systemIIncorrect oil pressure C
ICooling systemIOver cooling C
IOthersIMalfunction of evaporative emission control system C
8. KnockingIFuel injection system A
IIntake systemILoosened oil filler cap B
IBeltIDefective timing B
ICompressionIIncorrect valve clearance C
IIncorrect valve timing B
ICooling systemIOverheating A
9. Excessive engine oil
consumptionIIntake systemILoosened or cracked PCV hose A
IDefective PCV valve B
ILoosened oil filler cap C
ICompressionIDefective valve stem A
IWorn or stuck piston rings, cylinder and piston A
ILubrication systemILoosened oil pump attaching bolts and defective gasket B
IDefective oil filter seal B
IDefective crankshaft oil seal B
IDefective rocker cover gasket B
ILoosened oil drain plug or defective gasket B
ILoosened oil pan fitting bolts or defective oil pan B
74
2-3b[K100]DIAGNOSTICS
1. Engine Trouble in General

1. Water Pump
B2M1188A
(1) Water pump ASSY
(2) Gasket
(3) Heater hose
(4) Thermostat
(5) Gasket(6) Thermostat caseTightening torque: N´m (kg-m, ft-lb)
T1:
First 10+4/þ0
(1.0+0.4/þ0, 7.2+2.9/þ0)
Second 10+4/þ0
(1.0+0.4/þ0, 7.2+2.9/þ0)
T2:6.4±0.5 (0.65±0.05, 4.7±0.4)
4
2-5[C100]COMPONENT PARTS
1. Water Pump

5) Disconnect radiator outlet hose (A) and heater
by-pass hose (B) from water pump.
H2M2515A
6) Disconnect connectors from radiator main fan
(A) and sub fan (B) motors.
B2M2035A
7) Lower the vehicles.
8) Remove radiator main fan [W6A0].> and sub fan motor assembly [W7A0].>.
B2M2036
9) Remove V-belts.

B2M2308
10) Remove timing belt.

B2M2037
11) Remove automatic belt tension adjuster.
H2M2375
12) Remove belt idler No. 2.
H2M2518
13) Remove camshaft position sensor.

B2M2038
9
[W2A1]2-5SERVICE PROCEDURE
2. Water Pump

14) Remove left-hand camshaft sprocket by using
ST.
ST 499207100 CAMSHAFT SPROCKET
WRENCH
B2M2039A
15) Remove left-hand belt cover No. 2.
B2M2040
16) Remove tensioner bracket.
H2M2380
17) Remove tensioner bracket.
18) Disconnect heater hose from water pump.
19) Remove water pump.
G2M0210
20) Installation is in the reverse order of removal.
CAUTION:
IReplace gasket with a new one.
IWhen installing water pump, tighten bolts in
two stages in alphabetical sequence as shown
in figure.
Tightening torque:
10+4/þ0N´m (1.0+0.4/þ0kg-m, 7.2+2.9/þ0ft-lb)
S2M0760A
2. 2500 cc MODEL
1) Disconnect ground cable from the battery.
B2M1723
2) Lift-up the vehicle.
3) Remove under cover.
B2M0014
10
2-5[W2A2]SERVICE PROCEDURE
2. Water Pump

4) Drain engine coolant completely.

B2M0015A
5) Disconnect connectors from radiator main fan
(A) and sub fan (B) motors.
B2M2035A
6) Loosen bolts which hold lower side of radiator
main fan and sub fan shrouds.
B2M2041
7) Disconnect radiator outlet hose (A) and heater
by-pass hose (B) from water pump.
H2M2515A
8) Lower the vehicle.
9) Remove radiator main fan [W6A0].> and sub fan assemblies [W7A0].>.
B2M2036
10) Remove V-belts.

B2M2308
11) Remove timing belt.

S2M0017
12) Remove automatic belt tension adjuster.
H2M2403
11
[W2A2]2-5SERVICE PROCEDURE
2. Water Pump

5) Disconnect heater inlet hose.
B2M0138
6) Disconnect radiator inlet hose from water pipe.
B2M0139
7) Remove bolts which install water pipe on cylin-
der block.
B2M0141
B: INSTALLATION
1) Install water pipe on cylinder block.
Tightening torque:
6.4
±0.5 N´m (0.65±0.05 kg-m, 4.7±0.4 ft-lb)
CAUTION:
Use a new O-ring.
B2M0141
2) Connect radiator inlet hose.
B2M0139
3) Connect heater inlet hose.
B2M0138
24
2-5[W8B0]SERVICE PROCEDURE
8. Water Pipe