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2-16 PERIODIC MAINTENANCE
Periodic Maintenance Procedures
•
Install the fuel tank (see Fuel System (DFI) chapter).
•
Start the engine and warm it up thoroughly.
•
Check the idle speed.
Tachometer [A]
If the idle speed is out of the specified range, adjust it.
CAUTION
Do not measure the idle speed by the tachometer of
the m eter unit.
While idling the engine, inspect the engine vacuum, using
the vacuum gauge [B].
Engine Vacuum
Standard: 29.7 ±1.333 kPa (225 ±10 mmHg) at Idle
Speed 1 100 ±50 r/min (rpm)
If any vacuum is not within the specifications, first syn-
chronize the #3 and #4 throttle valves to the #1 and #2
throttle valves by using the center adjusting screw [A].
Special Tool - P ilot Screw Adjuster, C: 57001–1292 [B]
Front [C]
Example:
#1: 165 mmHg
#2: 190 mmHg
#3: 170 mmHg
#4: 200 mmHg
•
With the engine at the correct idle speed, equalize the
highest vacuum of #3 and #4 (example 200 mmHg) to
the highest vacuum of #1 and #2 (example 190 mmHg)
by turning the center adjusting screw.
NOTE
○
After adjustment, the final vacuum measurement be-
tween the highest throttle valves may not be 200 mmHg
(in this example). The goal is to have the highest two
vacuums between the left (1 and 2) and right (3 and 4)
banks be the same.
•
Open and close the throttle after each measurement and
adjust the idle speed as necessary.
•
Once the t hrottle valves have been synchronized, inspect
the main throttle sensor’s output voltage to ensure proper
operation (procedure is at the end of this section).