What was found
DURING PART 91 FLIGHT, PILOT NOTICED SMALL VIBRATION AT ENGINE UPON DECENT. PILOT ASKED ATC FOR MOST DIRECT ROUTE TO KCLW AND TOLD ATC HE DID NOT HAVE AN EMERGENCY AT THAT TIME. WHEN NEARING KCLW, PILOT HAD A WARNING FOR #3 CYLINDER HEAD TEMPERATURE OF 450 DEGREES. PILOT THEN DECLARED AN EMERGENCY AND LANDED THE PLANE AT KCLW. PILOT REPORTED THAT THE TEMPERATURE STARTED TO DROP DURING LANDING. AIRCRAFT IS CURRENTLY AT MAINTENANCE FACILITY FOR TROUBLESHOOTING AND INSPECTION. SUSPECTED CONTAMINATION IN #3 FUEL INJECTOR NOZZLE.