Second-hand 07 Honda crv 30 30 300,000 kilometers! Step on the gas and let go. What happened when the speed dropped first and then rose?

When there are a lot of carbon deposits in the throttle and combustion chamber of the engine, it will seriously affect the combustion of the mixture in the combustion chamber. Throttle carbon deposition will affect the engine intake; Carbon deposition in combustion chamber will affect fuel injection and ignition, which will lead to early detonation of ignition in severe cases. This will lead to unstable engine speed.

2. Throttle fault may be the fault of throttle position sensor or the fault of throttle control motor. Throttle position sensor, as its name implies, is to detect the opening of throttle to control the fuel injection quantity; The throttle control motor is used to open the throttle at a certain angle according to the depth of the throttle. When these two components fail, the amount of air pumped into the engine will change, which will cause the tachometer to move up and down when the vehicle is running.