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If you have an MW fuel injection pump there is also an adjusting screw on it to reduce the hot idle shaking but it only dose that a bit.
Usually, they need to be replaced and the adjustment procedure followed.
Some people also have set their idle speed too slow. There is a sticker that has what your idle speed is supposed to be. On mine it is on the left side top of the front radiator support. In the yellow circle on the attached pic.
You are supposed to back off that screw and adjust the idle speed with the normal idle speed screw that is on the engine side of the fuel injection pump and then slowly turn in the rack damper/governor idle pin screw till you remove a bit more engine shaking. You are supposed to remove as much shaking as you can without effecting the idle speed.
Also, the Engine and transmission are suspended on 2 engine/motor mounts and one rear transmission mount. If they are collapsed it is going to shake at idle speed.
Use only quality motor mounts.
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84 300D, 82 Volvo 244Gl Diesel
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