My son in law was getting limp home errors on his 200,000km old Pajero due to low turbo boost. They tracked it down to the EGR causing a blockage in the inlet manifold. When he pulled it apart you could only just see light at the other end of the manifold. It was probably 80% or more blocked by the same soot as in your photo. Much, much worse than that photo. Not the oily stuff, just the carbon in the first photo.
Bob
2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
2019 Discovery 5 SD6 SE, 20 inch wheels, 275/55R20 Nitto Grappler G2 tyres
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