BMW N62B44 - Throttle Valve

Throttle Valve
The throttle valve on the N62 is not necessary for engine load control. This is carried out
by the intake valves variable lift adjustment.
The tasks of the throttle valve are:
SSttaarrttiinngg tthhee eennggiinnee
Airflow is controlled by the throttle valve during the starting procedure when the air temp-
erature is between 20 ºC and 60 ºC, .
If the engine is at operating temperature, it will be switched to non-throttle mode approx-
imately 60 seconds after start up. In cold conditions however, the engine is started with
the throttle valve fully opened because this has a positive effect on the starting characteris-
tics.
EEnnssuurriinngg aa ccoonnssttaanntt vvaaccuuuumm ooff 5500 mmbbaarr iinn tthhee iinnttaakkee mmaanniiffoolldd
This vacuum is needed to exhaust the blow-by gases from the crankcase and the fuel
vapors from the activated charcoal filter.
TThhee bbaacckkuupp ffuunnccttiioonn
If the Valvetronic system should fail, the throttle valve implements conventional load con-
trol).
7
N62 Engine
42-02-25
Throttle Valve
• Throttle Valve Housing with Throttle Valve.
• Throttle Valve Actuator
• Two Throttle Valve Potentiometers