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You guys seem to know a lot about N52 compression ratios, so I’d like to ask a question. My 2006 BMW 330I with N52 engine shows a compression of 230 psi in cylinders 1 through 5 and 170 psi in cylinder 6. The compression should be 157 psi (10.7:1 x 14.7 psi atmospheric pressure). What in the world could cause such high pressure? The engine and car run just fine. However, I’m getting P0172 and P0175 codes and have been unable to find anything causing them, the usual culprits have been replaced or checked. It occurs to me that high cylinder pressure could alter exhaust air quality in such a manner that the computer would think the engine was running rich. But I’m stumped as to why I have such high pressure. If all cylinders somehow had a huge build up of carbon, wouldn’t the engine not run that well?
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