What Causes Jerking in Automatic Transmission Cars?

[MacLandon]

Jerking in automatic transmission cars is caused by clogged fuel injectors with poor atomization and damage to the transmission valve body. Introduction to Fuel Injectors: Modern automotive fuel injectors are essentially simple solenoid valves. When the electromagnetic coil is energized, it generates a magnetic force that lifts the needle valve, opening the injection port. Fuel is then sprayed at high speed through the annular gap between the needle valve tip and the injection port, forming a fine mist for optimal combustion. Older diesel engines used mechanically controlled fuel injectors, where precision components were employed to regulate fuel delivery. Introduction to Transmission Valve Body: The valve body is a component within the transmission responsible for gear shifting. When the vehicle reaches a certain speed, transmission fluid activates the valve body to automatically upshift or downshift. Automatic transmissions can adjust gear ratios based on engine load and vehicle speed, providing better power performance and fuel efficiency while reducing engine emissions. They offer easier operation and significantly improve driving safety and reliability in congested traffic conditions.