【Fault description】
     A BMW 750iL sedan, engine weakness, flat on the road to sit two or three people can not start.
     【Inspection process】
     After inspection, the transmission in the P, N file, the engine can be 3000 rpm, into the other file is up to 1000 turn, read the fault code is not abnormal, check the throttle (electronic section) opening is normal; check the fuel pressure , Obviously inadequate, check the oil pressure regulator, fuel filter, no major problems, check the pump circuit, set the fuse into the ammeter, the two pump operating current are not exceeded, only the pump out, and pump test , One of the oil pump from the oil outlet out of a little bit of water, most of the pressure from the lower part of the valve out, the analysis should be blocked out of the port. The reason is here, with 3.8L Chevrolet oil pump replacement, after the replacement, immediately test, fuel reaction agile, the engine work back to normal.