Hello
I came across a 00 Excursion with 200K miles from a dedicated diesel truck owner. He had it 9 months but wants to downsize.

On start up he says it produces white smoke for a few minutes and thinks it is either a O ring on a injector, glow plug or glow plug relay. What does white smoke at start up mean? He says it will do this when it isn't plugged up on a cold day otherwise there is no smoke. Is this something to worry about?

 

It is likely that you aren't letting the glow plugs run the full time before starting and the fuel isn't completely burning up. You can add an LED to the GPR and let the plugs run fully before starting.

http://www.guzzle7pt3.com/s_gpr.php

 

nothing really to worry about. new g p's cost about $80. bucks and a relay is about $40. easy to change out either. just do a test on them to see witch is bad.