Judging:Shake caused by unstable work.

Cars:Speed ​​speed fluctuates up and down within a certain range.

asthma:The cold car is normal, and the hot car is intermittently jitter.

In the case of no failure of the vehicle:

Generally after cleaning the throttle，If the throttle matches or match failure，will cause the vehicle to be too high。At this time, it can be matched by manual matching (power outage and other methods) or through the diagnostic device。

In the case of a failure of the vehicle:

1. When stepping on the brake pedal，The idling speed drops significantly，This indicates that the idle speed is too high due to the leakage of the vacuum -assisted pump。

2. When the vehicle is driving at high speed，Parking and waiting for the traffic lights to be too high，This indicates that the high idle speed is caused by the severe gas between the engine cylinder。

3. When the engine load is increased (turning on the air conditioner、Turn the steering wheel, etc.)，High idle speed returns to normal，Most of the air flowmeter failure at this time、The front/back -end leakage of the solar terms。

b. The idle speed is too low

Blocking travel leaks, belonging to circuit failure。Instead of poor line contact (related lines, etc.)，Forming a certain high resistance leads to a car travel phenomenon in the engine; line leakage (ignition coil leakage, etc.)，Causes engine jitter。

Yueyou shakes, it is a oil road failure。That is, when the mixed gas is thick, the car is generated，and the engine shake when the mixed gas is thin。But to distinguish between cause

Excessive carbon accumulation causes idle jitter，Specific performance as the difficulty of the vehicle，The engine shakes when the throttle pedal is released after starting.，Acceleration is poor at high speed。