1991 MITSUBISHI 3000GT Service Manual

FUEL SYSTEM - Throttle Body13-143Pre-removal and Post-installation Operation
l Draining and Supplying of Engine Coolant
(Refer to GROUP 00 -Maintenance Service.) - California>
3
THROTTLE BODY
I
idREMOVAL AND INSTALLATION
MIOSA-0
3\
OlFOOO4
NOTEThe layout of vacuum hoses (No. 3) of the constris for the DOHC (Non Turbo) - Federal.
OlFOO53
I drawing
Removal sl
+*1.Connection of accelerator cable2.Connection of air intake hose3. Connection of vacuum hose
4. Connection of TPS connector
5. Connection of
ISC motor connec6. Connedion of water hose
7. Vacuum pipe assembly
8.ThrottlebodyI)*9.Gasket
:eps
:tor
PrelectionThrottle bodySERVICE POINTS OF INSTALLATIONMlBSDAW9. INSTALLATION OF GASKET
Install the gasket so that the projection is where shown in
the illustration.
CautionPoor idling etc. may result if the gasket is installed
incorrectly.
1. ACCELERATOR CABLE ADJUSTMENTFor information concerning adjustment of the accelerator
cable, refer to
P.13-156.
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13-144FUEL SYSTEM - Throttle- Body
DISASSEMBLY AND REASSEMBLY
2.0
Nni1.4ft.lbs.
/
Disassembly steps
1. Dash pot2. Hose
3. Vacuum valve
>

l *4. Throttle position sensor
(within idle position switch)
5.
Idle speed control servo
assembly
6. Throttle body
7FU1023
\7FU1057 1SERVICE POINT OF DISASSEMBLY
MlBSFAN
Caution
1.When loosening a Phillips screw which has been firmly
tightened, use a Phillips screwdriver that is an exact fitfor the screw.
2. Do not remove the throttle valve.
3.Be careful when removing the throttle position sensorand idle speed control servo mounting screws, as
adhesive has been applied these screws.
INSPECTION
Ml3SHAt.lDASH POT INSPECTION
(1) Check the dash pot diaphragm for damage. First, push up
the rod fully and closing tightly the nipple with a finger,
release the rod. The diaphragm is intact if the rod does not
return to the initial position while the nipple is held closed
with a finger. If the rod returns, the diaphragm is broken.
Replace the dash pot.
VACUUM VALVE INSPECTION
(1) Remove the filter from the vacuum valve.
(2) Connect a hand vacuum pump to the black nipple of the
vacuum valve.
(3) With the other nipple closed by the finger, apply a negative
pressure of 500 mmHg (19.7 in.Hg.) to make sure that the
negative pressure is maintained.
(4)Let go your finger and make sure that the negative pressure
leaks out gradually.
hSB Revision1

FUEL SYSTEM - Throttle Body13-145Orifice
Nipple (green)3EM05iGroundThrottle
positlonsensor output
Idle-position
switchTh>ottle position
sensor power7FUO535(5) Disconnect the hand vacuum pump and connect it to the
other nipple.
(6)Make sure that the negative pressure leaks out as soon as it
is applied.
CLEANING THROTTLE BODY PARTS
(1) Clean all throttle body parts.
Do not use solvent to clean the following parts:
l Throttle position sensor (Idle position switch)
l Idle speed control servo
If these parts are immersed in solvent, their insulation will
deteriorate.
Wipe them with cloth only.
(2) Check if the vacuum
pot-t or passage is clogged. usecompressed air to clean the vacuum passage.
SERVICE POINT OF REASSEMBLY
M13SGAN4. INSTALLATION OF THROTTLE POSITION SENSOR
(1) Set the throttle position sensor to the throttle body as
shown in the diagram.
(2) After turning the throttle position sensor 90” in the
clockwise direction to set it, tighten by turning the
screw.
(3) Connect the circuit tester between 1 (ground) and 3
(output), or between 3 (output) and 4 (power). Then,
make sure that the resistance changes smoothly when
the throttle valve is slowly moved to the fully open
position.
(4) Check for continuity across terminals 2 (Idle position
switch) and 1 (ground) with the throttle valve both fully
closed and fully open.
IThrottle valve positionIContinuityI
Fully closedConductive
Fully openINon-conductiveIIf there is not continuity with the throttle valve fully
closed, turn the counterclockwise direction, and then
check again.
(5) If the above specifications are not met, replace the idle
position switch.
1 TSB RevisionI

13-146FUEL SYSTEM - Fuel Tank
FUEL TANKREMOVAL AND INSTALLATIONM13GA- -12 Nm
8 ft.lbs. WPre-removal Operation
l Draining of the Fuel0 Release of Residual Pressure fromHigh Pressure Hose.(Referto P.13-137.)
5-6Nm25 ft.lbs.
b22 ftlbs.16
V26 Nm
19 ft.lbs.
03FOOO7
Removal steps
** I. Fuel gauge cover2. Fuel pump and fuel gauge unit assembly
connector
3. Fuel tank cap4. Drain plug
5. Splash shield
6. Fuel filler neck protector
** 7. Vapor hose8. Fuel filler neck9. Fuel filler hose
l * IO. Vapor hosel 11. Return hose+* l * 12. High pressure fuel hosel * 13. Vapor hose14. Leveling pipe15. Self-locking nut
16. Fuel tank++
17. Overfill limiter (Two-way valve)I)+ 18. Vapor hosel + 19. Fuel pump and fuel gauge unit assembly
;d
I
1 TSB Revision

FUEL SYSTEM - Fuel Tank13-147
Rubber hose
ngn
03FOOl
9
OSFOOB
05FOO7SERVICE POINT OF REMOVAL
MlBGBAK
12. DISCONNECTION OF HIGH PRESSURE FUEL HOSEDisconnect the hose from body main pipe first and then
from fuel pump.
Caution
Cover the hose connection with rags to prevent splash
of fuel that could be caused by some residual pressurein the fuel pipe line.
INSPECTION
MlBGCAMl Check the hoses and the pipes for crack or damage.
l Check the fuel tank cap for malfunction.
l Check the fuel tank for deformation, corrosion or crack.
l Check the fuel tank for dust or foreign material.
NOTEIf the inside of the fuel tank is to be cleaned, use any one of
the following:
(1) Kerosene
(2) Trichloroethylene
(3) A neutral emulsion type detergent
OVERFILL LIMITER (TWO-WAY VALVE)Connect a clean rubber hose to the overfill limiter and check for
operation.
Inspection procedureLightly blow from the inlet
(fuel tank) sideNormal conditionAir passes through after a
slight resistanceLightly blow from the outletAir passes through
(canister) sideISERVICE POINTS OF INSTALLATION
MlSGDAT19. INSTALLATION OF FUEL PUMP AND FUEL GAUGE
UNIT ASSEMBLY
Align the three positioning projections of the packing with
the holes in the fuel pump and fuel gauge unit assembly.
TSB Revision18.13. IO. 7. CONNECTION OF VAPOR HOSE
(1) If the pipe has a stepped part, connect the vapor hose
to the pipe securely, up to the stepped part, as shown in
the illustration.
(2) If the pipe does not have a stepped part, connect the
vapor hose to the pipe securely, so that it is the
standard value.
Standard value: 25
- 30 mm (1.0 - I.2 in.)

13-148FUEL SYSTEM - Fuel Tank
Canistide
Do3041Flare nut
Se&e side
0310430%
e:00817. INSTALLATION OF OVERFILL LIMITER (TWO-WAY
VALVE)Install so that the overfill limiter is facing in the direction
’,~
shown in the illustration.L.&l
12. CONNECTION OF HIGH PRESSURE FUEL HOSETemporarily tighten the flare nut by hand, and then tighten it
to the specified torque, being careful that the high pressure
fuel hose does not become twisted.
CautionWhen tightening flare nut, be careful not to bend or
twist line to prevent fuel pump from damage.
11. CONNECTION OF RETURN HOSEConnect the return hose to the pipe securely, up to the
stepped part, as shown in the illustration.
1. INSTALLATION OF FUEL GAUGE COVER
Before installing the fuel gauge cover, apply the specified
sealant to the rear floor pan.
Specified sealant: 3M ATD Part No. 8509 or equivalent
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FUEL SYSTEMFuel Pump and Fuel Gauge Unit Assembly- and Overfill Limiter (Two-Wav Valve)13449
FUEL PUMP AND FUEL GAUGE UNIT ASSEMBLY ANDOVERFILL
LIMITER (TWO-WAY VALVE)
1:REMOVAL AND INSTALLATIONMIBUA- -
L
Removal steps
l *1. Fuel gauge cover
2. Fuel pump and fuel gauge unit assembly
connectorl *3. Overfill limiter (Two-way valve)*I) I)+4. High pressure fuel hose connection (body
side)a* I)*5. High pressure fuel hose connection.
(tuel pump side)03FOOO7l *6. Fuel pump and fuel gauge unit assembly
~03FOOll
I
LJISERVICE POINTS OF REMOVAL
MlSUBAC4. DISCONNECTION OF HIGH PRESSURE FUEL HOSE
(BODY SIDE)
Caution
Cover the hose connection with rags to prevent’splash
of fuel that could be caused by some residual pressurein the fuel pipe line.
5. DISCONNECTION OF HIGH PRESSURE FUEL HOSE
(FUEL PUMP SIDE)
NOTEHold the pump side nut with a wrench while turning the nut
on the hose side.
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13-150FUEL SYSTEMFuel Pump and Fuel Gauge Unit Assembly- and Overfill Limiter (Two-Way Valve)
Rubber hose
9Flare nut
Secure side
03Yo43Camst
ide
DO304INSPECTION
MlBUCAB
OVERFILL LIMITER (TWO-WAY VALVE)~
Connect a clean rubber hose to the overfill limiter and check for
operation.
‘d
Inspection procedureNormal conditionLightly blow from the inlet
(fuel tank) sideAir passes through after a
slight resistanceLightly blow from the outlet
(canister) sideAir passes through
SERVICE POINTS OF INSTALLATION
M13UDAC6. INSTALLATION OF FUEL PUMP AND FUEL GAUGE
UNIT ASSEMBLY
Align the three positioning projections of the packing with
the holes in the fuel pump and fuel gauge unit assembly.
5. 4. CONNECTION OF HIGH PRESSURE FUEL HOSE
Temporarily tighten the flare nut by hand, and then tighten it
to the specified torque, being careful that the high pressure
fuel hose does not become twisted.
CautionWhen tightening flare nut, be careful not to bend or
[J’twist line to prevent fuel pump from damage.\3. INSTALLATION OF OVERFILL LIMITER (TWO-WAY
VALVE)Install so that the overfill limiter is facing in the direction
shown in the illustration.
1. INSTALLATION OF FUEL GAUGE COVER
Before installing the fuel gauge cover, apply the specified
sealant to the rear floor pan.
Specified sealant: 3M ATD Part No. 8509 or equivalent
1 TSB RevisionIII