Motronic MED 9.1
Cylinders 1-6 Fuel Injectors N30,
N31, N32, N33, N83, N84
The High-Pressure Fuel Injectors are inserted into
the cylinder head. They are triggered by the ECM
according to firing order. When triggered, they spray
fuel directly into the cylinder.
Due to the design of the engine, injection takes place
from one side. For this reason, the fuel injectors for
cylinder bank 1, 3, and 5 are longer than the fuel
injectors for cylinder bank 2, 4, and 6.
Operation
360_137
Peak and Hold Injectors are used in Volkswagen FSI
engines. The injector receives full current only long
enough to open the pintle (Peak), then pulses the
current to hold the injector open (Hold).
It has relatively low internal resistance compared
to a saturation injector. Additionally, it has a faster
response time that is required to inject fuel into the
combustion chamber at the correct moment for the
most efficient combustion.
Fine-Mesh Strainer
Solenoid Cell
Effects of Failure
A defective fuel injector is recognized by misfire
detection and is no longer triggered.
Valve Needle with
Solenoid Armature
Teflon Sealing Ring
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