The fault light of Haifuxing is always on, and the temperature of the water thermometer should be in the middle of 90 degrees, and suddenly it will drop to 0, and the idle speed will become very high.

Idle jitter is related to engine combustion, and the problem of engine combustion depends on the problem of oil circuit and gas circuit.

First of all, the oil circuit is blocked, which leads to inaccurate fuel injection. Please check the fuel injector and gasoline grille. If there is no problem, then look at whether the spark plug and ignition coil have sufficient power supply, whether there is a breakdown phenomenon leading to fire, and insufficient combustion will cause idling jitter.

Let's look at the gas path again. The gas path is intake and exhaust. Whether the air intake is sufficient depends on the air grid. If there is no problem with the air intake, it depends on whether the oxygen sensor is faulty. Sensor failure will lead to too much or too little intake air entering the cylinder, uneven mixing ratio with gasoline, leading to knocking or insufficient combustion. Then look at the tail gas, whether there is a pungent smell in the tail gas, and whether there is abnormal black, white and blue smoke. If yes, check the rear oxygen sensor, and the failure of the rear oxygen sensor will also lead to uneven intake. Throttle is the simplest repair method. It is estimated that 4S has been tailored for you, so I won't say much about it.

There is also to see if the fuel consumption is too high recently. If it is too high, it must be one of the faults I mentioned above.