PeachParts Mercedes-Benz Forum - View Single Post

ja17 · #19 10-12-2008, 08:52 AM

Hello Brice,

Yes, it is most important that you have a good clean fuel supply with proper pressure and volume. The fact that your main filter stays clean, and the car never completely stops driving (just will not idle) leads me to believe that you may want to check the warm running device (WRD) on your mechanical injection pump. This is mechanical warm up regulator which adjust the mixture during the engine warm up cycle. This is easy to check out. It is located on the back top of the injection pump and has two coolant hoses hooked to it. On the back side is a small round horizontal canister (actually an air filter) don't get it connfused with the electrical solenoids below. You can use a section of hose as a stethescope. When the engine is cold you will hear air rushing into the air canister. When the engine reaches operating temperature you should hear no rushing of air. These units will get stuck during long periods of inactivity (storage). If your WRD is stuck in cold position, the engine will be running much to rich to idle when warm, but may still drive. Maybe Arthur or myself can post some photos later.