Reasons for delaying gear shifting to automatic transmission and ways to eliminate them
For many car owners with automatic transmission, the question often arises: why does the automatic transmission delay switching between steps. Such a disadvantage may appear not only on units with high mileage, but also on relatively new cars. There may be several reasons for this "ailment", and to eliminate them, in some cases, you will need the help of a competent motorist or specialist. For further details, go here: transmission shifts hard from 1st to 2nd
How the automatic transmission works
In order for the transmission to work properly and not delay acceleration, you need to understand that the automatic transmission is a more complex unit in design, in comparison with the "mechanics".
It includes several important elements:
- a planetary system with a set of speeds, which is responsible for the transition between automatic transmission stages;
- a torque converter, which acts as a clutch and transmitting torque to the wheels;
- clutches and mechanisms that ensure the transition between gears;
- valve body - electronic control unit.
Symptoms of tightening gear changes
Like any complex mechanism, an automatic transmission can malfunction. There are often cases when the automatic transmission shifts gears with a delay, tightens them by 2-3 seconds. At this moment, there is a "dip" of power, and the car sharply loses in speed.
In order for the changeover to take place, the oil pressure is increased. The pump wheel transmits torque to the turbine wheel. When they reach a certain acceleration, the clutches brake the low gear, the oil through the valve accelerates the next stage. This is how the automatic transmission speeds change without a "failure".
During tightening, the speeds do not switch on time, although the torque increases to dangerous 3.5-4 thousand. After that, there is a delay in switching for a couple of seconds. Then the car loses power, and switches to overdrive. The presence of such failures during the operation of the automatic transmission is a serious flaw and a reason to engage in unit diagnostics.
Reasons for long switching
The automatic transmission delays the change of steps for several reasons:
- insufficient tension on the throttle cable;
- damage to the rubber adapter of the modulator;
- incorrect adjustment of the modulator;
- overheating of the automatic transmission due to the used transmission oil;
- accumulation of metal shavings in the working chambers of the automatic box;
- clogged oil filter;
- improper operation of a car with an automatic transmission (slipping off-road, transporting heavy loads, trailers, towing other vehicles;
- failure of the solenoids responsible for changing the automatic transmission gears;
- failure of electronic sensors.
Shift from 1st to 2nd gear
The movement of a car with automatic transmission begins with depressing the brake pedal. At the first speed, the car moves only the first few meters of the path, then the stage is changed. Often there is a prolonged shift from 1 to 2 speed due to insufficient heating of the unit, in particular the gear oil.
With a lack of "transmission", there is also a violation of smoothness in the operation of the "automatic" gearbox. To correctly measure the oil level, you need to check the dipstick twice: with a cold engine and a warm one.