White smoking at start up but clears on warm up

- Possible causes

• Incorrect pump timing
  
• Air in fuel
  
• Faulty glow plugs

Engine black smoking- Possible causes:

• Faulty injectors  
• Injection pump malfunction

Engine starts but won’t idle- Possible causes:

• Incorrect pump timing
  
• Faulty fuel supply
  
• Injector pump malfunction
  
• Air in fuel
  
• Restricted fuel return