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You could probably spray some of the CRC stuff through the crankcase tubes. (#1 and #2 in pic) They connect to the intake manifold after the throttle valve. Check for some guides on how to spray CRC. I would think spraying a small volume at a time would be the way to go and have someone press the gas a little. Expect misfires and throttle valve fault codes.
I helped my brother walnut blast is N54 Z4 at 30k and there was a lot of carbon build up. I can only imagine how much carbon we must have. I have the tools for walnut blasting but I don't want to drop the engine to gain enough access to do it.
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