At 250 thousand spring breeze, the idle speed of oil return rises and falls.

Check whether there is throttle oil storage or throttle carbon deposit.

Causes of engine idle speed fluctuation:

1, throttle oil accumulation, throttle carbon accumulation, unclean intake and poor intake will all cause idle speed to rise, and throttle carbon accumulation or engine oil is a common cause of idle speed instability; 2. The spark plugs caused by individual spark plug failures are too weak; 3. The oil circuit represented by the choke is blocked and the air inlet pipe is faulty; 4. Related sensor failure Related sensor failure will make ECU unable to control the correct air-fuel ratio; 5 ignition advance angle is too large or too small. The idle speed of automobile engine is a problem of various signal sensors, such as intake air flow sensor, Hall sensor, knock sensor and coolant temperature sensor. , need to be combined with the detector for analysis.