Lifan 620. Manual — part 24

9. With normal start, unstable idle speed or flameout under partial load (with A/C on, etc)
Common trouble location:

1. A/C system; 2. Idle speed regulator; 3. Fuel injector

Diagnosis Flow

Table 1-75

S/N Operation Test

Results

Actions

Yes Adjust

1

Check if the accelerator cable is locked or over

2

3

4

5

6

97

10. With normal start, idle speed too fast

Common trouble location: 1. Throttle body and idle speed by-pass air way; 2. Vacuum pipe; 3. Idle
speed regulator; 4. Coolant temperature sensor; 5. Ignition timing

Diagnosis Flow

Table 1-76

S/N Operation Test

Results

Actions

1

2

3

4

5

6

98

11. Unfavorable rotation speed or flameout during acceleration

Common trouble location:

1. Fuel with water; 2. Intake air pressure sensor and throttle position sensor;
3. Spark plug; 4. Throttle body and idle speed by-pass air way;
5. Intake air way; 6. Idle speed regulator;
7. Fuel injector; 8. Ignition timing; 9. Exhaust pipe.

Diagnosis Flow

Table 1-77

1

2

3

4

5

6

No Next

step

7

Check the fuel for normal operation.

Yes Next

step

8

Check if the ignition sequence and timing of the engine

can meet with the standards.

No

Check and repair

ignition timing

99

Table 1-77 (Continued)

S/N Operation Test

Results

Actions

Yes Next

step

9

Check the exhaust pipe for smoothness.

No

Repair or replace

exhaust pipe

Yes Diagnosis

help

10

Connect the electronic injection system adapter. Turn on

the ignition switch. Check the power supply of the pin

12#, 13#, 44#, 45#, 63#. Check the grounding of the pin

Check and repair

1

2

3

Yes Next

step

4

Draw out the wire of one of the cylinders, and connect

with the spark plug. Keep the electrode of the spark plug

about 5mm from the engine body. Start the engine, and

and check if the high voltage fire is normal.

No

Check and repair

ignition system

100