i have an 86 f-350 with the 6.9 l got new injectors ,new plugs .It blows heavy blue smoke running or just ideling. but isnt lacking any power?i also changed fuel pump old one was weak. thanks for any help.

 

what kid of mileage are you getting?The first thing that comes to mind is unburned fuel,but it sems like you're already chasing the fuel thing down...dunno,are you sure you're not seeing antifreeze enter the combustion process?..I'm not very experienced with diesels,but I was always told that blue smoke was an indicator of the motor not being totally up to operating temp....