故障现象 一辆日本大发850微型汽车,在行车中化油器突然出现有节奏地回火,且加速时这一现象更明显。汽车无法加大油门行驶,动力明显下降。 故障检查 导致化油器回火的原因有混合气过稀、点火错乱、配气不正时、进/排气门关闭不严等。由于化油器回火是有节奏出现的,所以不可能是混合气过稀。检查分电器的点火正时,分电器外壳的固定情况以及断电器触点与凸轮等一切正常,说明点火错乱也不可能。最后将疑点集 Trouble phenomenon A Japanese Daihatsu 850 micro-cars, carburetors in the traffic suddenly appeared rhythmically tempering, and accelerate the phenomenon more pronounced. The car can not increase the throttle driving power decreased significantly. Cause of the fault check carburetor tempering mixed gas is too thin, ignition confusion, the valve is not positive, the intake / exhaust valve closed lax. As the carburetor tempering is a rhythm, so it can not be too dilute mixture. Check the distributor ignition timing, the case of the distributor housing and the breaker contacts and cam and everything is normal, indicating that ignition is not possible. The final doubt set