Cessna 340/340A
Flight Crew Multiengine; Flight Crew Private
Flight Crew Last 90 Days 25; Flight Crew Total 1250; Flight Crew Type 850
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Flight Crew Landed As Precaution
Aircraft
Lost left engine power. Smoke from left engine nacelle. No loss of oil temp or pressure. No loss of CHT or EGT. Reduced power. Landed uneventfully. Tower cleared me for immediate landing. Shut aircraft down after taxi to ramp. Preliminarily [diagnosis] seems [to indicate] the turbocharger stopped working.
C340A pilot reported loss of engine power accompanied by smoke from the left engine nacelle. Pilot landed at nearest suitable airport.