What is the reason why Roewe 350 idle throttle is too wide?

Air intake, exhaust, ignition, oil injection, mechanical failure and so on can be ruled out. First, air intake, check whether there is air leakage, dirty throttle and idle valve. Just check one by one and give you some common faults, 1, air leakage. Using carburetor to spray air intake to see engine jitter. This method is the most convenient. The three-way catalytic converter is blocked. 3. Lack of cylinder, check the spark plug and fuel nozzle. Electronic control system, water temperature sensor, intake pressure sensor, throttle position sensor, idle motor. 5. Engine bracket, timing, valve, etc.

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Generally speaking, unstable idle speed means dirty throttle and carbon deposit.

Blow the throttle to 4000 rpm first, and then release the throttle to see if the speed indicator stops at around 1000 rpm. If there is a pause, there is no need to clean up. If there is no pause, clean it directly.

How many kilometers did you drive without washing the accelerator? Generally speaking, the speed of washing for 20,000 to 30,000 will be unstable, and it will be fine to drive for a while.

Material cost 10 yuan, labor cost can be settled in 30 yuan and 20 yuan, and washed in the garage outside.