My F 250 is blowing smoke out both stacks.It just came out of the shop 3 weeks ago after having trans rebuilt and rear main seal replaced.....Last Friday I filled it up with diesel at the same store I always go to.Then drove it 30 miles to Walmart.It was parked at Walmart for about 30-40 minutes.Started it back up and drove it about 5 miles and it starts pouring white smoke out of both stacks.The truck is running great.Motor sounds good.Turbo spinnin up fine.but all this smoke?I drove it home and the more I drove it the worse the smoke got.Its been parked since last friday except for starting it up to move it a few times.It starts fine no lugging.Rolls over twice and fires up.Does anyone have any info or diagnosis procedures to find out the problem?Thanks so much!!!Any advice would be welcome.

 

sounds like egr coolant valve

 

try plugging the block heater up leave on all night and start it in the morning...see if that helps..