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The cleaning cycle of automobile fuel injectors is not fixed and uniform, and will be affected by factors such as injector type (manifold injection vs. direct injection), fuel quality, driving habits, and use environment. The following is a recommendation for the cleaning cycle of different types of fuel injectors and an analysis of influencing factors:

1. Manifold injection injector (intake port injection)

Features
The injection pressure is low (3-5 bar), the nozzle diameter is large (about 0.2-0.5 mm), and the sensitivity to fuel impurities is relatively low.

The fuel is injected in the intake manifold, and some of the fuel can flush the carbon deposits near the intake valve, but if the fuel cleanliness is poor, it may still cause the injector to be blocked.

Regular cleaning cycle
Generally recommended: Clean once every 20,000-40,000 kilometers (floating according to usage).

Short cycle situation (need to be cleaned in advance):
Poor fuel quality: long-term use of fuel containing impurities and high sulfur content, or adding inferior fuel additives.
Poor driving habits: long-term short-distance low-speed driving (the engine is not fully heated, the fuel atomization is poor and easy to condense), frequent idling (incomplete combustion leads to carbon deposits).
Environmental factors: the air filter element is not replaced in time, and dust enters the intake system to pollute the injector.
Long-term situation (can be extended appropriately):
Use high-quality fuel: such as high-grade gasoline (95# and above) from regular gas stations, which contains more detergent ingredients.
Good driving habits: regular high-speed driving (such as running on the highway), using airflow to flush the intake system to reduce carbon deposits.

2. In-cylinder direct injection injector (GDI)
Features
The injection pressure is extremely high (100-350bar), the spray hole is extremely fine (0.1-0.3 mm, some are nanometers), and it is easy to be blocked by impurities and colloids in the fuel.
The fuel is directly sprayed into the combustion chamber, and there is no fuel flushing near the intake valve, and the carbon deposit problem on the intake valve is more serious (which may indirectly affect the operation of the injector).
Regular cleaning cycle
Generally recommended: Clean once every 10,000-20,000 kilometers (more frequent than manifold injection).
Short cycle situation (need to be cleaned in advance):
Poor fuel quality: The direct injection system has extremely high requirements for fuel cleanliness, and impurities are easily stuck in the spray hole or needle valve.
Long-term urban congestion driving: Incomplete fuel combustion under low-load conditions, easy to generate carbon deposits and adhere to the surface of the injector.
Not using original fuel additives: Direct injection models are usually recommended to regularly add original PEA (polyether amine) detergents to prevent carbon deposits.
Long cycle situation (can be appropriately extended):
Regular use of fuel additives: Add detergents that meet manufacturer standards every 5,000-10,000 kilometers to dissolve carbon deposits in the injector and combustion chamber.
Driving on mixed roads: Frequent high-speed or suburban driving, the engine is under high-load conditions, the combustion temperature is higher, and less carbon deposits are generated.

3. Other factors affecting the cleaning cycle
1. Frequency of use of fuel additives
If high-quality fuel additives (such as Chevron TCP, 3M PN6010, etc.) are used regularly, carbon deposits on the injectors can be effectively suppressed and the cleaning cycle can be extended by 10%-20%.
Poor-quality additives may cause injector blockage and should be avoided.
2. Vehicle age and mileage
New car (0-3 years): If properly maintained, the cleaning cycle can be carried out according to the upper limit (such as 40,000 kilometers for manifold injection and 20,000 kilometers for direct injection).
Old car (more than 5 years): Wear of internal parts of the injector may cause reduced sealing or deformation of the spray hole. It is recommended to shorten the cycle (such as 20,000-30,000 kilometers for manifold injection and 10,000-15,000 kilometers for direct injection).
3. Fault symptom judgment
When symptoms such as idle jitter, weak acceleration, abnormally high fuel consumption, and difficulty in cold start occur, even if the cleaning cycle has not yet arrived, the injector should be checked in time for blockage or poor atomization.