Ford Falcon. Manual — part 182
303-04c-16
Single Fuel LPG
303-04c-16
DESCRIPTION AND OPERATION (Continued)
Closed Loop Operation
Vehicle Backfire Information
During closed loop operation the stepper motor is
In the event of backfire, stop and inspect the vehicle
driven open and closed. The HEGO (Heated Exhaust for damage in the form of cracked or split intake
Gas Oxygen) sensor detects rich or lean air fuel
components, dislodged components such as air
ratios. While the HEGO is reading a rich signal, the
cleaner upper or manifold nipple caps, etc. Note that
motor ramps closed and the step position increases.
in extreme cases, backfire can damage the PCV valve
When lean, the motor ramps open and the step
or MAP sensor rendering the vehicle undriveable.
position decreases.
Backfires are caused by poor ignition system
condition or an over-lean air/fuel ratio.
Starting
Engine Coolant Hoses
During engine start, the prime solenoid pulses open
and delivers fuel for a few hundred milliseconds only.
Coolant hoses are connected to the heat exchanger in
The LPG lock-off solenoids are opened as the engine the converter to provide heat, which is required for the
starts to turn and the stepper motor is reset. The
LPG evaporation process.
prime solenoid operation (on time) is dependant on
the engine temperature and the time since the ignition
was previously turned off.
Adaptive Learn Strategy
The PCM control strategy includes an adaptive learn
capability. The system automatically adjusts for
vehicle, environmental, and fuel differences as the car
ages. The adaptive learn system can be reset by
disconnecting the power to the PCM for a few
minutes. This is recommended after servicing the
LPG converter, engine or changing the air filter.
Positive Crankcase Ventilation System
The Crankcase ventilation system is re-routed to the
inlet manifold near the throttle body to ensure even
Item
Description
air/fuel ratio and therefore maintain a smooth idle.
1
Hose from LPG converter to heater
Vapour Hose
2
Quick connector on hose
This unique vapour hose carries the LPG vapour from
3
Hose from engine to LPG converter
the converter to the gas/air mixer.
Engine Servicing Requirements
Gas / Air Mixer
There are no special running-in requirements for this
The function of the gas/air mixer is two-fold:
vehicle. Please refer to the standard running-in
Convert intake airflow into a vacuum signal that is requirements in the Owners Manual.
detected at the converter.
Engine Oil
Thoroughly mix air and fuel together.
The 15W-40 oil specification is recommended.
The combustion products of LPG does not blacken
but tends to acidify the engine oil more than petrol
does. This problem may be exaggerated when oil
change intervals are extended because the oil
appears clean to the owner.
Spark Plugs
Vehicles operating continuously on LPG require a
colder range spark plug than vehicles operating on
petrol.
The recommended spark plugs for LPG are:
Specification: DENSO K20SR11
Gap: 1.1mm
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303-04c-17
Single Fuel LPG
303-04c-17
DESCRIPTION AND OPERATION (Continued)
“Repair” means any repair to the vehicle which
Coolant
involves opening the high pressure gas lines to the
The normal service schedule for the cooling system
atmosphere.
should be adhered to. For optimum cooling system
NOTE: LPG fuel tanks must be removed from the
performance of vehicles running on LPG, the
vehicle and be inspected and pressure tested by an
recommended coolant specification is:
authorised tank test centre every 10 years. A plate
Motorcraft Rl-32/33 Anti-corrosion/Anti-freeze
with the original test date and other information is
(33% MIN) and water. This specification provides
attached to the tank. Removal of the tank should only
frost protection to a minimum temperature of
be performed by a registered operator.
-16
°C and should be replaced every 3
NOTE: Running the vehicle on LPG places a greater
years/100,000 km (whichever comes first).
demand on the ignition system (as compared to
It is paramount to cooling system efficiency that this is
petrol) -Accordingly the ignition system must be
the only coolant used. With the addition of extra
maintained in excellent condition. e.g. Replace spark
components into the cooling system (the LPG
plugs at intervals indicated below, without failure.
Converter), it is imperative that the replacement
schedule be strictly adhered to.
In addition to the normal vehicle maintenance
schedule as set out in the Vehicle Owners Manual the
Should the cooling system be dirty, it is necessary to
following minimum maintenance schedule should be
flush out the converter coolant passages in addition to
followed for an LPG equipped vehicle.
the engine cooling system.
Some states require the inspection of the LPG system
Scheduled Maintenance
annually coincident with the registration inspection.
All LPG installations must comply with standard
Where this is not a requirement it is recommended
AS/NZS 1425-1999 and most states require that any
that an annual inspection be performed by an
person engaged in the installation and/or repair of
Authorised Ford Dealer or a registered LPG repairer
LPG vehicles must be registered.
in accordance with the requirements of standard
AS/NZS 1425-1999.
Minimum LPG Maintenance Schedule
Maintenance Interval (kmx1000)
Items
15
30
45
60
75
90
105
120
High Pressure Leak Check:
Converter and lock offs
I
I
I
I
I
I
I
All service line connections
I
I
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I
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I
Filler valves
I
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I
LPG Tank connections
I
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All mounting points for tightness
I
I
Filter/Lock Off - Inspect Filter
F
F
Auto fill limiter operation
I
I
Air Filter Element
I
R
I*
R
I
R
I
R
Spark Plugs
R
Diagnostic Checks
N
N
N
N
N
N
N
N
Drain Second Stage Bodies
D
D
D
D
D
D
D
D
Inspect Idle Jet
I
I
I
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I
I
I. Inspection of condition and testing of systems
Replace every 3 years/100,000km.
operation.
When coolant is due for replacement per standard
I*. Clean, replace as required.
service schedule, flush out original coolant and
refill system with R1-32/33
R. Replace.
Anti-corrosion/Anti-freeze (33% MIN) and water.
F. Filter/Lock - off - inspect filter replace as
NOTE: In severe/unusual (dusty/sandy) conditions the
necessary (high pressure leak check when
air cleaner element should be checked, cleaned and
replaced)
replaced more frequently to allow correct operation of
D. Remove plugs and drain converter body
the vehicle.
N. Diagnostics check to be carried out
NOTE: By Australian law tanks must be inspected
NOTE: Engine Coolant must be maintained as
every 10 years by an authorised LPG tank tester.
follows:
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303-04c-18
Single Fuel LPG
303-04c-18
DESCRIPTION AND OPERATION (Continued)
NOTE: The total LPG system must be periodically
filter and O-Rings. Refit/replace ensuring the filter is
inspected in accordance with standard AS/NZS
not crimped by the bowl.
1425-1999.
Converter Body
LPG Service Procedures
Drain Second Stage Converter Bodies
LPG number plate decals
This must only be carried out by registered
technicians.
Every time the vehicle is in for service or repair of any
kind, ensure that the red LPG decals are fixed to the
Close the service valve.
front and rear registration plates on metal plates (in
Run the engine until it stalls.
the centre), in the diamond orientation.
Try to re-start engine several times.
NOTE: 1 decal front and rear for sedan and wagon.
Prior to opening the high pressure system to
2 decals front and rear for ute.
atmosphere, the battery negative lead must be
removed and carefully isolated.
Auto Fill Limiter (AFL)
Every 45,000 km it is necessary to test the operation
of the AFL. The tank must be empty to accurately
check the operation of the AFL and owners should be
encouraged to present the vehicle for service with the
tank nearly empty. Instructions to that effect appear in
the owners manual. The remaining LPG in the tank
will need to be decanted.
LPG Filter Service
The filter which is integral with converter requires
inspection and replacement (if necessary) after the
initial 15,000 km of travel and at 75,000 km intervals
thereafter. Always replace ‘O’ rings when replacing
filter.
Item
Description
1
Inlet Filter Bowl
2
Plugs - to drain converter body
Despite the filter prior to the converter, sludge will
gradually accumulate in the converter body and must
be drained at least every 15,000 km to ensure correct
converter operation.
Ideally this should be performed at the same time as
the filter in the filter lock off is replaced and the
converter is devoid of gas.
There are two hex headed drain plugs located at the
base of the converter. Copper washers are installed
between the drain plug heads and the converter body
to ensure sealing of the chambers.
Item
Description
To drain the converter, remove the plugs and allow
1
Inlet Filter Bowl
the sludge to escape – when replacing the plugs
install new copper washers. Conduct a leak test after
2
Plugs - to drain converter body
replacing the plugs. This draining process must be
conducted while the converter/engine is at running
LPG Filter Service Procedure
temperature.
This must only be carried out by registered
technicians.
Idle Jet
Close the service valve.
Clean idle jet every 15,000 km as indicated in the
service schedule. The head of idle jet is a 4 mm
Run the engine until it stalls.
thread (Refer to Converter of Disassembly and
Try to restart engine several times.
Assembly in this section for Tool no. 303-689).
Prior to opening the high pressure system to
atmosphere, the battery negatlve lead must be
removed and carefully isolated. Remove the bowl,
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303-04c-19
Single Fuel LPG
303-04c-19
DESCRIPTION AND OPERATION (Continued)
When a leak free condition has been confirmed,
Leak Testing
heating, welding or flame cutting can be carried
High Pressure Leak Testing
out as long as it is no closer than one metre to a
fuel container. The service valve must be closed
A high pressure leak check of the LPG system must
when a vehicle is to be left overnight in the
be carried out at 15,000 kilometre intervals. The
workshop or when stored for any period of time.
standard AS/NZS 1425-1999 requires that this be
carried out at least annually. In most cases this would
Tank Testing
fall in line with one of the 15,000 km service intervals.
An important requirement of the AS/NZS 1425-1999 is
Leak Testing Equipment
the testing and inspection of the LPG fuel tank. Every
ten years, the tank must be removed from the vehicle
The most common method of leak detection is to use
and tested by an Authorised Container Test Station.
a foam test solution. It should be a proprietary leak
Once testing is completed and passed, the tank is
test solution, specifically formulated for this purpose,
stamped with the test date and is ready for another
eg. must not cause corrosion of steel lines etc.
ten years service.
Electronic combustible gas detectors are also
regularly used by many Technicians.
Exhaust Relocation
Refer to the operating instructions supplied with either To provide the extra space required for the gas tanks,
method to ensure accuracy and safety when leak
the exhaust route has been changed and the muffler
testing.
pattern modified. This arrangement however, uses
similar exhaust mounting locations as on the standard
Leak Testing Procedure
BA Falcon.
The fuel system must contain sufficient LPG liquid to
ensure a minimum vapour pressure to 450 kPa,
otherwise a leak check will not be valid.
Begin by testing:
all the tank and filler fittings.
service line joints.
Where possible run or crank the engine to ensure
all components are supplied with liquid LPG.
Test all Filter/Lock Off and Converter connections
and joints.
A large leak can actually blow away the foam solution
and not produce any bubbles, this must be carefully
monitored. Remember since LPG is heavier than air,
test thoroughly below all fittings and components.
Where a leak is indicated, remake the joint, using a
suitable sealing compound. The sealing compound
used must be specifically suitable for LPG
applications.
CAUTION: Leaking joints with parallel
threads and seats are uncommon. If this type of
joint leaks, check for correct torque. If the leak
persists after re-torquing, the joint must be
replaced. Thread sealing compounds should not
be used to seal these types of joints.
Welding and Heating
The Australian Standard has two requirements
regarding welding and heating on or near an LPG
vehicle.
Until an LPG vehicle has been tested and
confirmed leak free, a Zone 1 hazardous area
exists up to 3 metres from the perimeter of the
vehicle. No welding, heating or flame cutting may
be carried out in this area.
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