My car is the engine JL465Q5 of Chongqing Changan Star 637 1 in 2005. The car was overhauled in July last year, and the cylinder pipeline, fire plug and throttle valve have been replaced.

This problem also happened in my car. When I went to the repair shop for repair, the repairman replaced the idle motor, but the idle speed was still unstable. Clean the throttle assembly, replace the throttle position sensor, intake pressure sensor and spark plug, adjust the valve clearance and replace the distributor assembly. The fault remains the same. 10 days later, the problem remains unresolved. Finally, I tried to unplug the oxygen sensor myself, and a miracle happened. The idle speed is surprisingly stable, and it is normal to drive all the way home. In order to verify whether it is a problem with the oxygen sensor, I left the fire on when I got home and plugged in the oxygen sensor, and the fault appeared again. I finally solved the problem.