Intake manifold switchover, function - GF07.61-P-3028A

ENGINE 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /955 /970 /972 /973 /975

ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969

Shown on model 210

Fig 1: Identifying Intake Manifold Switchover Function - Shown On Model 210

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task

Actuating variable intake manifold switchover valve in line with engine load and speed.

Function

The variable intake manifold switchover valve is actuated by the ME-SFI control unit in line with the engine load and speed:

When starting and at low rotational speeds, the variable flaps are opened - variable intake manifold switchover valve de-energized.
At a load exceeding 50% as of approx. 1750 rpm up to approx. 3900 rpm the variable flaps are closed. The variable intake manifold switchover valve is opened by means of a ground signal by the ME-SFI control unit for this purpose. The intake manifold switchover diaphragm unit is pressurized with vacuum and operates the flap shafts.
As of, for example, 3900 rpm the variable intake manifold switchover valve is no longer actuated. The variable flaps open through spring force.

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