FUEL SYSTEM AND THROTTLE BODY 5-27
Step 3
• Turn in all the idle air screws to the complete close position.
• Check for difference of vacuum between #1 and #2.
• Equalize these two by gradually turning back the air screw on
the higher vacuum side until the vacuum comes down to the
lower. Similarly perform the same procedures between #3
and #4.
• Check for the synchronization adjustment. If the adjustment is
not yet correct, remove each idle air screw and clean them
with a spray-type carburetor cleaner and blow dry with a com-
pressed air.
• Also, clean the idle air screw passageways.
NOTE:
* Slowly turn the idle air screw in clockwise and count the num-
ber of turns until the screw is lightly seated.
* Make a note of how many turns were made so the screw can
be reset correctly after cleaning.
Step 4
Repeat the procedures of Step 2 and Step 3.
USE OF VACUUM BALANCER GAUGE
Calibrating each vacuum gauge
• Lift and support the fuel tank. (5-3)
• Start up the engine and run it in idling condition for warming
up.
• Stop the warmed-up engine.
• Disconnect the IAP sensor coupler and remove the IAP sen-
sor. (5-14)
• Disconnect the vacuum hose 1 from the #1 throttle body.
• Connect one of the vacuum balancer gauge hose 2 to the
vacuum nipple on the #1 throttle body.
SAMPLE
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