tech help
 

hi guys
i live in outback Western Australia and i need some help.
i drive a 2003 Jeep Grand Cherokee Lorado 2.7ltr cdr diese, it starts from cold straight away just 1 - 2 seconds but when it is warmed up it wont start some times its cranking for 15 second maybe three or four times before it starts it then runs really well. any help or suggestions.