[ChrisCountryRed]

I have a 2000 F250 as described in signature. After making 1500 miles of an 1800 mile trek across the southern US, I left my truck on my 1100 rpm high idle tune to keep the A/C cold for my dog while I went to grab a bite of lunch. Came back out 30 minutes later and left. Once back on the road, noticed that when I was accelerating on to the Interstate, I had a nice cloud of white smoke bellowing out of my exhaust. Went away after about a half mile. 2 days later, my 7.3 sat at idle for the better part of 6 hours. Again, white smoke for the first half mile. Now, my truck does spend a good bit of time idling, and those have been the two times I have noticed the white smoke. Checked for coolant leaks, checked the res bottle and it is still full, so I don't think it is eating coolant. I know that Dmax's have an issue with white smoking when you have a bad injector, but I am not leaking fuel into the oil, do not have rough idle, and I am getting better fuel mileage, so I don't believe I have a problem there.
Both white smoke days were on the same tank of fuel, haven't noticed it since I filled up again, thinking there might have been a bit of water in that tank.

Any ideas?

 

[tinman13kup]

White smoke is caused by unburnt fuel, which can be caused by many things. Low fuel pressure, bad injector nozzle, low compression to name a few. Is this only happening after it sits and idles for an extended period of time?

 

[ChrisCountryRed]

Yes, I have only noticed it twice, first after idling for about half an hour, then idling for that long period. Only other time I get white smoke has been on a cold start. And it only does that after i haven't run the truck for a couple days.