Get out your Hoppes cleaning kit select an appropriate bore brush,
tie a string to one end, put a fishing weight on the other, drop the
weight through the tube and pull the brush through, accompanied with
carb cleaner.
From what I have read, carb cleaner.
There is a similar pipe on later model M119 engines that is
difficult to access, and the consensus there seems to be the use of
a wire with something on it to scrub and carb cleaner.
Fortunately, the earlier M119 models like mine have the EGR right up
front where you can get to it.
Dan
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