Sign 307 Car idling idling.

In view of what you said, the analysis may be that the three-way catalyst is blocked You can start the engine, connect the vacuum gauge and check the vacuum slowly and quickly (the normal vacuum is 57 ~ 7 1 kPa). Once the rotation speed reaches 2000 ~ 2500 rpm, the vacuum degree drops to zero or very low, indicating that the drainage system has been cut off. The three-way catalytic converter can be removed and diagnosed when the trial operation returns to normal.

There are indeed many failures of idling and idling shivering, and in actual maintenance, the most common failure is caused by dirt. From the circuit point of view, it is "resistant to running, leakage and jitter", that is, the line resistance is large and the contact is poor, such as the poor contact of the plug of the throttle position sensor, and the car runs when it forms high resistance; Line leakage, such as spark plug or high voltage line, jitter. From the oil circuit, it is "thick swimming and thin shaking", that is, when the ratio is thick, it will swim, and when the ratio is thin, it will shake. For example, Superman in the Santana era, the oxygen sensor failed, the mixture became thicker, and he traveled; The vacuum tube falls off, the mixing ratio becomes thinner and trembles. Starting from two points, that is, the circuit stroke is blocked and the oil circuit is thick and thin, find out the cause of the fault.

Next time there is a problem, it will be early. I just can't pull, my friend. i forgot