2005 Toyota condo 3000 diesel. Engine never been opened no smoke, powerful but sometimes it doesn't start. Once it choose to start it starts and runs smoothly until you switch it off then it won't start

SOURCE: toyota diesel engine very rough on start but then runs smooth

Check the heater plugs normaly when the engine is cold heater plugs work to heat up combustion chamber then starts easy,also long raning fuel filter mybe so change the fuel filter.

SOURCE: F250 Diesel engine won't start in cold weather

check your glow plug relay! located on the right side head

SOURCE: starting problem

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

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This will help.

Thanks