Hisun HS800 Service Manual

Engine Management System
7-7
Plugging
Fuel deposits cause plugging.
Plugging can cause flow restrictions,
frictional changes and the collection of
other particles attracted by the tacky
surface. The flow restrictions can degrade
emissions and drivability.
Other fuel and environmental conditions
may cause crystal or corrosion growth in
the injector and cause a shift in flow.
Oxidation stability of the gasoline affects
the potential for deposit formation and
must be controlled by the fuel supplier.
Increased levels of detergent additives
reduce the rate of injector plugging.
Cleaning Procedure
Electrically disable the fuel pump by
removing the fuel pump connection.
Relieve the fuel pressure in the system
and disconnect the fuel connection at the
injector. Plug the fuel feed line.
Injector cleaner with the specific ratio of
the cleaner and gasoline to be mixed in
the Injector cleaning tank.
Connect the injector-cleaning tank to
injector in the vehicle.
Pressurize the injector-cleaning tank to
system pressure.
Start and idle the engine for 15- 20
minutes.
Disconnect the injector-cleaning tank from
the system and install the fuel pump
connections. Connect the fuel feed line to
injector.
Start and idle the vehicle for an additional
2 minutes to ensure the residual injector
cleaner is flushed from system.
Throttle Body Assembly(with stepper
motor)
The throttle body and sub assemblies are
responsible for controlling intake air flow,
Idle air flow, and to sense throttle position.
Throttle Body Removal
Disconnect negative terminal of the
battery.
Disconnect electric lead wire of throttle
position sensor coupler, stepper motor
coupler and MAP/MAT sensor coupler (if
this sensor is mounted on the throttle
body).
Disconnect accelerator cable from throttle
body.
Remove air cleaner outlet hose and
throttle body outlet hose.
Cleaning Procedure
If there is a cover on the bottom, it may be
removed and cleaned using carburetor
cleaner (3M make recommended). Once
the throttle body cover is removed, spray
the throttle-body cleaner inside the
shipping air passage, and use a brush to
gently dislodge the dirt, gum and
varnish that are present. Do not let the by-
pass holes be blocked by dirt or foreign
particles.

Hisun HS800 Specifications

General

Brand	Hisun
Model	HS800
Category	Utility Vehicle
Language	English