Periodic Maintenance and Adjustment 8-56
Table 5: Solution of Common Problems in Engine System
S/N Problems Solutions
1
Idle speed cannot be
adjusted.
1. Check if the throttle cable is stuck or restricted.
2. Check if the high-voltage wire is in poor contact.
2 Idle speed is not stable.
3. Check if the CDI needs replacing.
1. Check and clean air filter.
2. Check muffler for partly block and clean spark arrestor.
3
Power performance is
falling.
3. Check tire pressure.
1. Check air cleaner and admission line for leak.
2. Check the connection joint of exhaust pipe with engine
or muffler for leak.
4 Popping noise in engine.
3. Check the grade of gasoline to see if it’s too low.
1. Check to determine if the battery voltage drops during
cold weather.
5
Engine is difficult to start
at low temperature.
2. If the temperature is under -18℃, have the vehicle
placed in warmer place for start.
1. Check the cooling fan to make sure it is not blocked by
dirt or debris.
2. Check the radiator sensor for damage and check the fan
motor for proper operation.
6 Coolant boils.
3. Check if the dilution of the antifreeze and make sure the
ratio is 1:1 or greater.
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