Carbon Cleaning with Walnut Blasting

[awe504]

Hello, the engine is a ISM 410. It has only has 215k, but has 15k hrs. So needless to say it idles a lot. It has been to 2 different dealers and $20k later still having the same problem. So it has been handed off to me. I believe a combination of leaking EGR valve (tested), valve stem seals (verified), and clogged CCV filter (possibly NEVER changed) and plugged doser injector (verified) and original IMAP sensor (clogged completely) have contributed to the problem. I dont understand how 2 different shops and $20k later it has the original IMAP is still installed. But I digress. The issue now is all the soot on the intake. I removed the manifold and verified bad stem seals. The intake is coated with VERY heavy soot. 1/8" - 1/4" I am thinking of blasting with a walnut shells. I feel like it definitely has to be cleaned to prevent a comeback. I work on BMWs and this is their recommended method. I know Rawze wanted to see some verification.

BMW TSB
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I have read past posts debating cleaning methods for soot, and it seemed the consensus is that it is better left alone unless the head is off. I am replacing valve stem seals so I will have the entire valvetrain out and I will know for sure all valves are closed. And this method applies vacuum while blasting to keep dust to a minimum. I was planning on doing it before I replace the stem seals. I suppose I am asking for opinions from the MOST knowledgeable thinktank on the subject.