According to Light Plane Maintenance staff: A frequent reader question we receive is: Why does my engine seem to lack the power it once had? We can't tell you exactly what's wrong, but we can get you pointed in the right direction, and that begins with a systematic approach. We can also tell you that one of the most common and hard to troubleshoot engine complaints is that of low power or low static rpm. Complaints on this subject were once so numerous on the Lycoming O‑235 series that Lycoming published an entire service instruction on the subject (S.I. 1388C).
7701 Las Colinas Blvd., Ste. 800, Irving, TX 75063