Weak Acceleration - Lifan 620 Maintenance Manual

S/N
9 Check the exhaust pipe for smoothness.
Connect the electronic injection system adapter. Turn on
the ignition switch. Check the power supply of the pin
10
12#, 13#, 44#, 45#, 63#. Check the grounding of the pin
3#, 51#, 53#, 61#, 80#. Are they OK?

12. Weak acceleration

Common trouble location:
1. Fuel with water;
3. Spark plug;
6. Intake air way;
9. Ignition timing; 10. Exhaust pipe.
S/N
Check the clutch, tyre pressure, brake, tyre size and
1
four-wheel alignment for normal operation.
2 Check if the air filter is blocked.
Connect the fuel pressure gauge (the connection point
is the front end of the intake pipe of the fuel distribution
3 pipe assembly), and start the engine. Check if the fuel
pressure of the engine under full working condition is
about 350kPa.
Draw out the wire of one of the cylinders, and connect
with the spark plug. Keep the electrode of the spark plug
4
about 5mm from the engine body. Start the engine, and
and check if the high voltage fire is normal.
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Table 1-77 (Continued)
Operation
2. Intake air pressure sensor and throttle position sensor;
4. Ignition coil; 5. Throttle body and idle speed by-pass air way;
7. Idle speed regulator;
Diagnosis Flow
Table 1-78
Operation
100
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Test Results Actions
Yes Next step
Repair or replace
No
exhaust pipe
Yes Diagnosis help
Check and repair
No
relevant line
8. Fuel injector;
Test Results Actions
Yes Repair
No Next step
Check and repair air
Yes
intake system
No Next step
Yes Next step
Check and repair fuel
No
supply system
Yes Next step
Check and repair
No
ignition system