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A golden passenger sea lion light bus with a mileage of about 35 thousand km and a 491Q-ME multi point injection engine. Users reflect: the car abrupt acceleration is not smooth, in rapid acceleration instantaneous engine jitter, speed slightly decreased, fault time and space compressor was cut off, the fault sometimes lasted several minutes, sometimes only a few seconds. The car has been repaired several times in many repair shops, and has changed engine ECU, main relay, etc., adjusting the position of the crankshaft position sensor gap. But all the failures were not completely eliminated.