Technician A says that injector nozzles are either opened by the high-pressure pulse from a distributor pump or electrically by

Question

4 years ago

9

Technician A says that injector nozzles are either opened by the high-pressure pulse from a distributor pump or electrically by

the computer on a common rail design. Technician B says that indirect injection (IDI) occurs directly into the combustion chamber. Who is correct? A. Technician A B. Neither Technician A nor B C. Technician B D. Both Technicians A and B

Advanced Placement (AP)

2 answers:

maxonik [38] · Answer 1 · 2021-12-26T18:15:31+03:00

maxonik [38]4 years ago

4 0

Its b, neither. High pressure common rail fuel injectors are opened by either solenoids or engine oil pressure.

strojnjashka [21] · Answer 2 · 2021-12-26T20:16:52+03:00

Answer

A. Technician A is correct

Explanation

The injector nozzle can be opened electrically by the computer on a common rail design. An electric solenoid connected to the injector is controlled by this computer and opens to pass the fuel into the injector pressure chamber. High pressure of the fuel in the pressure chamber pushes the needle valve up which compresses the return spring in the needle valve thus opening the valve.