21
Engine Control Linkages
GASOLINE VEHICLE - FUEL SYSTEM
CLOSED THROTTLE OR IDLE ADJUSTMENT – PEDAL-START VEHICLES
When the accelerator pedal is released, the engine will stop. Therefore, it is not possible to measure or set idling
speed under normal vehicle operating conditions. Set throttle valve as follows:
1.
Loosen the throttle body idle screw so that it is not touching the throttle lever
.
2.
Slowly tighten the idle screw until it lightly touches the throttle lever, then tighten it an additional 1 whole turn
(360 degrees).
3047
Figure 21-8
Idle Screw
HOW TO MEASURE GROUND SPEED
Best Method
An easy way to check ground speed is by using a GPS device or smartphone application (app). If these are not
available, use the alternate method below.
Alternate Method (Calculated)
Ground speed is easily determined by a known distance travelled, divided by the amount of time it took to travel that
known distance (
Rate = Distance/Time
).
1.
Establish a known distance to travel (example: 100 ft. (30.5 m) in a safe location using cones or other type of
marker.
2.
Drive vehicle and bring to maximum speed before reaching the first cone.
3.
Using a stopwatch, record the amount of time it takes to travel from the first cone to the second cone at maximum
speed.
4.
With distance and time determined, calculate ground speed:
4.1.
Rate in seconds:
Divide distance (100 ft (30.5 m)) by time (5 seconds) = 20 ft/sec (6.1 m/sec).
4.2.
Convert seconds to hour:
Multiply 20 ft/sec (6.1 m/sec) by 3600 (the number of seconds in an hour) =
72000 ft/hour (21960 m/hour)
4.3.
Convert to MPH:
Divide 72000 ft/hour by 5280 (number of ft in 1 mile) = 13.64 miles/hour
Convert to KPH:
Move the decimal point over three places; 21960 m/hour = 21.96 km/hour
Page 21-12
2019 Precedent Villager 2 Maintenance and Service Manual
Summary of Contents for Precedent Villager 2
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