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The TEXVIK signal recorder and analyzer ( https://shop.fcd.eu/texvik-ds8-mk-ii/ ) was central to the successful analysis of the real problem. It would have been quite difficult without him, because his new software allowed editing the recording so that we could see the error. Here you can find more information about the case: BLOG - https://www.fcd.eu/blog/post/2137 (if you want to comment on the blog, you need to register: https://www.fcd.eu/account/register.. .And a complete case with details and records: https://www.fcd.eu/story/17495 This is a detailed video on the analysis of the problem of the Mercedes 2.2 CDi, which after replacing the water pump showed a defect in the intake air quantity sensor and because of this it fell into emergency mode immediately after starting. We were also looking for something that might have been forgotten to be connected, changed or forgotten in the intake, but we thought of analyzing the unusual booming sound. And it was a hit!