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 --------- This will help. Thanks
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