As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL INJECTOR REMOVED FOR BEING EXCESSIVE RICH. THIS INJECTOR IS A NEW UNIT WITH 405 TTSN. IAW MFG CHECK LIST, THE ENGINE IS LEANED AT 2200 RPM TO PEAK. AFTER LEANING THE THROTTLE S RETARDED TO 2200 RPM, THE NORMAL RISE IS 40-50 RPM. THIS WAS IN EXCESS OF 200 RPM. AT O/H THE REPAIR STATION REPORTED THE IDLE SETTING AND SENSITIVITY WERE OUT OF TOLERANCE.