加速不良（Accelerated failure）.docVIP

加速不良（Accelerated failure） 1 floor, small and medium-sized, published in 2009-11-10 09:41, only see the author Diagnosis and analysis of bad engine acceleration Acceleration is bad, that is, the engine does not add oil, causing the main reason for the poor acceleration, look at four aspects, namely supply system failure, ignition system failure, mechanical failure and control system failure. I. bad engine acceleration fault (a) fault phenomenon on accelerating the engine speed is not increased immediately after the pedal, a hysteresis phenomenon, accelerate or slow response during acceleration and engine speed with minor fluctuations, or tempering, blowout phenomenon. (two) the cause of the failure is mainly due to the improper air fuel ratio, poor ignition performance and poor sealing performance. 1. dilute mixture, low fuel pump pressure, fuel injector, fuel filter, air intake manifold, vacuum leakage, etc.. 2. throttle position sensor or air flow meter, intake manifold absolute pressure sensor fault. 3. the ignition advance angle is incorrect. 4. spark plug or high voltage line is bad, high voltage spark is weak. 5. the exhaust recirculation system is not working well. 6. there is a blockage in the exhaust pipe. (three) fault diagnosis and removal 1. carry out fault self diagnosis and check if there is any fault code. Air flow meter, throttle position sensor and other faults will affect the acceleration performance of the engine. A special diagnostic instrument also needs to observe the dynamic data stream, and find the cause of the fault according to the fault code and dynamic data. 2. check the ignition timing. At idle, it is usually about l0 degrees to L5 degrees, or as specified in the maintenance manual. If not correct, the initial ignition advance angle of the engine should be adjusted. When accelerating, the ignition advance angle shall be automatically increased to 20 degrees to 30 degrees.. If abnormal, check ignition control system. 3. measure the resist