1991 MITSUBISHI ECLIPSE cooling

ENGINE <1.8L Engine>- Service Adjustment Procedures9-25
MANIFOLD VACUUM INSPECTION(1) Before inspection and adjustment, put the vehicle
in=following state.
l Engine coolant temperature:
85-95°C (185-205°F)
l Lights, electric, cooling fan, and accessories: OFF
lTransaxle: Neutral
(N or P for vehicles with an automa-
tic transaxle)
l Steering wheel: Neutral position
(2) Check that the idling revolution speed is normal.
(3) Remove the PCV hose from the PCV valve and attach a
vacuum gauge.
(4) Check that the negative pressure at the intake manifold
during idle revolution is normal.
Standard value: 510 mmHg (20
in.Hg)(5) If outside the standard value, isolate the cause by referring
to the following table and repair the fault.
SymptomCauseRemedy
l The vacuum gauge reading is less thanl Ignition timing is retarded.l Adjust the ignition timing.
standard value, but the pointer is
-stable.
l The vacuum gauge pointer swingsl Air mixture concentration too
slowly.rich.
l Check ECI-MULTI system.l The vacuum gauge pointer drops irre-
gularly.
l The vacuum gauge pointer drops inter-
mittently to 30 to
160 mmHg (1.2 to
6.3 in.Hg).l The vacuum gauge pointer drops sud-
denly from the normal reading to 250rronnrt$,(9.8 rn.Hg), then returns tol Air mixture concentration too
lean.
l Check ECI-MULTI system.0 Incomplete close contact of in-
take exhaust valve seat.l Check and repair the valve.
l Broken cylinder head gasketl Replace cylinder head gasket.

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a--ENGINE
<2.0L DOHC Engine> -Service Adjustment Procedures9-75
JMANIFOLD VACUUM INSPECTION
NO9FNAO(1) Before inspection and adjustment, put the vehicle into the
following state.
l Engine coolant temperature:
85-g5”C (185-205°F)
l Lights, electric, cooling fan, and accessories: OFF
lTransaxle: Neutral (N or
P for vehicles with an automa-
tic transaxle)
l Steering wheel: Neutral position
(2) Check that the idling revolution speed is normal.
(3) Remove the PCV hose from the PCV valve and attach a
vacuum gauge.
(4) Check that the negative pressure at the intake manifold
during idle revolution is normal.
Standard value:: 490
mmHg (19.3 in.Hg): 480
mmHg (18.9 in.Hg)(5) If outside the standard value, isolate the cause by referring
to the following table and repair the fault.
ymptomICause1 Remedy
The vacuum gauge reading is less than
standard value, but the pointer is
stable.
The vacuum gauge pointer swingsslowly.
l Ignition timing is retarded.
l Air mixture concentration too
rich.
l Adjust the ignition timing.
l Check ECI-MULTI system.
The vacuum gauge pointer drops
irre-gularly.l Air mixture concentration too
lean.
l Check ECI-MULTI system.
The vacuum gauge pointer drops inter-mittently to 30 to 160
mmHg (1.2 to
6.3 in.Hg).
The vacuum gauge pointer drops sud-
denly from the normal reading to 250
mmHg (9.8 in.Hg), then returns tonormal.
l Incomplete close contact of in-
take and exhaust valve seat.
l Broken cylinder head gasket
l Check and repair the valve.
l Replace cylinder head gasket.

INTAKE AND EXHAUST - Intake Manifold < 1.8L Engine>1145
SERVICE POINTS OF REMOVALNllMBAI
3. DISCONNECTION OF RADIATOR UPPER HOSE
Make mating marks on the radiator hose and the hose
clamp, and then remove the radiator hose.
r
04A0088 19. DISCONNECTION OF FUEL HIGH PRESSURE HOSE
Relieve pressure in the fuel pipe line to prevent fueloutflow.
(Refer to GROUP 14 - Service Adjustment Procedures.)
Caution
Cover fuel pipe line with rag after relieving pressure ascertain pressure may still remain.16.REMOVAL OF DELIVERY PIPE, FUEL INJECTOR AND
PRESSURE REGULATOR
Remove delivery pipe with fuel injector and pressure
regulator.
CautionDo not drop injector when removing delivery pipe.
INSPECTIONNllMCAl
Check the following points; replace the part if a problem isfound.
AIR INTAKE PLENUM
(1) Check air intake plenum for defect or cracks. Replace ifdefective
or cracked.
(2) Check load (negative pressure) of drain port. Check
cooling water and jet air passages for clogging. Clean if
required.
(3) Check deflection of installation surface with straight edge
and feeler gauge.Standard value: 0.15 mm
(.006 in.) or less
Limit:0.3 mm (.012 in.)05AOOB4

II-16INTAKE AND EXHAUST - Intake Manifold c 1.8L Engine>
05A0033
0580188Mating marksINTAKE MANIFOLD
(1) Check for damage or cracking of any part.+4
(2) Check load (negative pressure) of drain port. Check ,cooling water
and jet air passages for clogging. Clean if
required.
(3) Check deflection of installation surface with straight edge
and feeler gauge.Standard value: 0.15 mm
(006 in.) or less
Limit:
0.3 mm (.012 in.)
SERVICE POINTS OF INSTALLATIONNllMDAXa
29. INSTALLATION OF COVER
Install the cover so that the side of the cover imprinted
“fj‘x? ‘Y bf4l~(gasket side) is at the gasket side.-T16. INSTALLATION OF DELIVERY PIPE, FUEL INJECTOR
AND PRESSURE REGULATOR
Caution
Be careful not to drop the injector when the delivery
pipe is installed.
3. CONNECTION OF RADIATOR UPPER HOSEAlign the
mating marks on the radiator hose and the hose
clamp and install; then apply pressure where shown bythe
arrows in the illustration so that the clamp is correctly
seated at the clamp’s previous trace indentations.A
Caution
-Be absolutely sure that the hose clamp is correctly
seated to its previous trace indentations.

FUEL SYSTEM - Service Adjustment Procedures <1.8L Engine>l-4-41
SERVICE ADJUSTMENT PROCEDURES

CURB IDLE SPEED INSPECTION
CautionNlIFiiAE
The improper setting (throttle valve opening) will increase
exhaust gas temperature at deceleration, reducing catalystlife greatly and deteriorating exhaust gas cleaning per-
formance. It also has effect on fuel consumption and
engine braking.
ilter
Paper clip
16A0898
PI-e-conditions for inspection
0Engine coolant temperature: 85-95°C (185-205°F)
0Lights, electric cooling fan and accessories: OFF
l Transaxle: Neutral
(P for vehicles with an automatic
transaxle)l Steering wheel: Neutral position (vehicles with a power
steering)l Check ignition timing and adjust if necessary. Refer to
GROUP 8.
NOTEWith vehicles for Canada, the headlights and taillights, etc.
remain on even when the lighting switch is turned OFF, but thiscauses no problems during inspection.
(1) Insert the paper clip to the connector.
(2) Connect the tachometer to the inserted clip.
(3)Run the engine for more than 5 seconds at an engine speedof 2,000 to 3,000 rpm.
(4) Run the engine at idle for 2 minutes.
(5) Read the idling rpm. If it is not within the specified speed,
check the idle speed control system.
Curb idle speed: 700
f 100 rpm
NOTEAdjustment of the idling speed is usually unnecessary,
because this system controls the idling speed.
IDLE SPEED CONTROL AND
THROTlLE POSI-
TION SENSOR ADJUSTMENT
N14FIATAdjustment conditions
l Engine coolant temperature:
85-95X (185-205°F)
l Lights, electric cooling fan and accessories: Set to OFF
l Transaxle: Neutral (P for vehicles with an automatic
transaxle)l Steering wheel: Neutral position (vehicles with a power
steering)
(1) Slacken the accelerator cable enough.
(2) Connect a tachometer.