我们在修车中发现一台经节能改造过的东方红—75拖拉机出现功率严重不足,发动机大油门时,蓝烟、黑烟、白烟一起从排气管向外排,小油门时声音正常;且发动机起动困难.经反复查找故障出在排气管 We found a repaired car in the energy-saving transformation of the East Red -75 tractor serious shortage of power, the engine throttle, blue smoke, black smoke, white smoke together from the exhaust pipe to the outside, when the small throttle sound normal ; And difficult to start the engine after troubleshooting repeatedly found in the exhaust pipe