After Volvo S80 cleaned the accelerator, the engine was seriously unstable and seemed to be out of the cylinder. How to study at idle speed?

To shorten the idle study time, you can try the following methods:

1, disconnect the negative electrode of the battery and connect it after 30 seconds;

2. Before the car starts, turn on the ignition switch for the first time, only turn on the power supply and do not start, lasting for 20 seconds;

3. After the interval of 15 seconds, turn on the ignition switch for the second time, only turn on the power and do not start, and press the accelerator pedal for 20 seconds at the same time;

4. After the interval of 15 seconds again, turn on the ignition switch for the third time and turn on the power supply to start the engine.

If the above methods do not work, it is recommended to check according to the following methods.

Check whether the solenoid valve of activated carbon tank can't be closed after being opened for a long time. Under normal circumstances, if the activated carbon system does not work, the solenoid valve should be closed.

Activated carbon tank is a device to collect fuel vapor in gasoline tank, and it is also a passage for gasoline tank to the atmosphere. In order to prevent the fuel vapor from polluting the air, the fuel vapor from the gasoline tank is collected and adsorbed by the activated carbon in the activated carbon tank, and then sent to the engine for combustion.

There is a pipeline from the activated carbon tank to the engine, and an electromagnetic valve is installed on the pipeline, which is controlled by the engine computer. When the engine accelerates and the speed is high, the activated carbon solenoid valve is opened, and the fuel vapor collected by activated carbon is sucked into the intake port through the vacuum of the intake port for re-combustion.

If the solenoid valve of the activated carbon canister is damaged, the normally open solenoid valve is not controlled by the engine computer, and a stream of air directly enters the intake pipe through the activated carbon canister and pipeline, but is not detected by the air flow meter, so that the engine computer receives an air flow signal that is smaller than the normal air flow, which reduces the fuel injection and dilutes the mixture, resulting in insufficient engine power and engine jitter.