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It's probably the ugliest Mercedes engine, has a plastic cover over the manifold to make it look prettier. In front of the intake manifold you have an enormous amount of stuff...alternator, A/C compressor, hydraulic pump, water pump, radiator, hoses, oil filter housing, cam position sensor, various other sensors. You're going to have to begin with your own eyes and ears. Remove the plastic cover so that you can actually see the manifold. If nothing is obvious, remove the belt and turn each ancillary by hand.
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