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1983 240D automatic
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14 Posts
Discussion Starter #1
Does anyone know what the throttle plate in the intake is for? I have heard that some 240D did not have one. I have never seen a diesel with a intake restrictor throttle plate on it before. Could it have something to do with emissions or efficiency?
 

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Emissions. Apparently sometimes the exhaust pressure isn't high enough to get sucked into the intake on its own.
 

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1984 300D
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5,070 Posts
This thread fooled me because it is an 83 240D

The older Mercedes Diesels that had Fuel Injection Pumps with Pneumatic Governors have a Buttery Fly Valve (Throttle Plate) in the Intake Manifold to create vacuum to operate the Governor.
On those models you would also find a tube or Hose going from the Intake Manifold to the rear of the Fuel Injection Pump where the Governor is.
 
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