As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE LOST POWER DURING CLIMB & OTHER ACFT REPORTED EXCESSIVE EXHAUST SMOKE. SHUT DOWN & SECURED ENG & RETURNED FOR LANDING. FOUND A LOOSE CLAMP ON THE COMPRESSOR DISCHARGE COUPLING CAUSING INDUCTION AIR TO BE DISCHARGED PRIOR TO REACHING THE ENG INTAKE & CAUSING OVER RICH CONDITION, EXPLAINING EXCESS EXHAUST SMOKE. MX RE-POSITIONED COUPLING, REINSTALLED CLAMP & PERFORMED SATISFACTORY GND RUNS.