The auto de compressor on the exhaust cam will drop the compression figure considerably. But to answer your original question yes incorrect cam timing can make the compression appear lower than the actual specs. If you have access to one a leak down tester is a far more accurate way of measuring engine health and will pin point the exact point of compression loss.
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Back on a gassy! 2018 EC300! 🤘
Txt 280 07 to make me feel like a gumby again
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