Excessive Fuel Consumption - Toyota 4Y 2006 Manual

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EXCESSIVE FUEL CONSUMPTION
Before beginning troubleshooting, ask the following questions and respond as necessary.
1. When did it start? (Since the vehicle was new, recently, since it has become colder etc.)
2. High fuel consumption compared with what? (The lift used previously, a similar vehicle, other manufacture's lift
etc.)
3.
What is the lift being used for? (Stacking and unloading cargo, carrying, in a small space, traveling distances etc.)
4. Others (Fuel, tyres, additional specifications, operating time, change in load, change of operator etc.)
Factors in high fuel
consumption
1. Engine structure (compression ratio, improved fuel burning, cooling loss, mechanical
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efficiency etc.)
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2. Vehicle structure (vehicle weight, tyres, drivetrain system transmission efficiency, gear ratio
etc.)
3. Conditions in the usage environment (weather, traveling environment, load environment,
operation method, altitude etc.)
4. Maintenance status of the engine and vehicle (ignition timing, air-fuel mixture, compression
pressure etc.)
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5. Specification, differences in attachments (mast lift height, attachments, air conditioner)
Places for inspection and adjustment when fuel consumption has become greater than previously
Classification
Ignition
Main places for inspection and adjustment
1. Vacuum hose
2. Vacuum advancer
3. Governor controller
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Drivetrain
Fuel
Compression
4. Cylinder
1. Slipping of the manual clutch
2. Slipping of the torque converter one-way clutch
1. Carburetor
2. Leak in the fuel system
3. Choke valve
1. Valve
2. Piston rings
3. Piston
Braking
Cooling
1. Brakes dragging
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2. Brake automatic adjustment mechanism
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3. Brake shoe return mechanism
1. Thermostat
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2. Coolant temperature [Point I]
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[Point 11
If the temperature of the engine coolant becomes too high or too low, optimal fuel combustion cannot be achieved
and fuel consumption increases. In particular, if repeated traveling and loading is carried out when the engine is cold,
the combustion timing is delayed due to slow propagation speed of the air-fuel mixture, and because the gasoline
has poor vaporization, the engine may misfire, resulting in imperfect combustion and loss of engine output.