THROTTLE BODIES
6-9
EAS26980
CHECKING THE INJECTORS
1. Check:
• Injectors
Damage → Replace.
EAS26990
CHECKING THE THROTTLE BODIES
1. Check:
• Throttle bodies
Cracks/damage → Replace the throttle bod-
ies as a set.
2. Check:
• Fuel passages
Obstructions → Clean.
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a. Wash the throttle bodies in a petroleum-
based solvent.
Do not use any caustic carburetor cleaning
solution.
b. Blow out all of the passages with compressed
air.
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ET5YU1014
CHECKING THE ROLLOVER VALVES
1. Check:
• Rollover valve 1 “1”
• Rollover valve 2 “2”
Damage/faulty → Replace.
NOTE:
• Check that air flows smoothly only in the direc-
tion of the arrow shown in the illustration.
• The rollover valves must be in an upright posi-
tion when checking the airflow.
EAS27000
CHECKING THE PRESSURE REGULATOR
1. Check:
• Pressure regulator
Damage → Replace.
EAS27010
CHECKING THE PRESSURE REGULATOR
OPERATION
1. Check:
• Pressure regulator operation
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a. Remove the pressure regulator cover.
Refer to “THROTTLE BODIES” on page 6-4.
b. Disconnect the fuel hose “1” from the pres-
sure regulator “2”.
c. Connect the fuel pressure adapter “3” be-
tween the fuel hose “1” and pressure regula-
tor “2”.
d. Connect the pressure gauge “4” to the fuel
pressure adapter “3”.
e. Connect the vacuum/pressure pump gauge
set “5” to the pressure regulator.
f. Start the engine.
g. Measure the fuel pressure.
2
1
Vacuum/pressure pump gauge
set
90890-06756
Pressure gauge
90890-03153
Fuel pressure adapter
90890-03176
YM-03176
Fuel pressure
392 kPa (3.92 kg/cm², 55.7 psi)
2
1
4
2
5
3
1
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