I have a 1989 E350 with a 7.3. At hwy speeds (55 or higher) I get blue smoke coming out the tail pipe. It will do it for a few minutes then clear up for a few minutes. I'm thinking valve guide seals, but don't know these diesels to well. Any body out there have any ideas?
Last edited by stockcar1974; 07-03-2014 at 09:15 AM.
Reason: mispelled word