Occasionally when I start my truck up I get some gray smoke. Is this normal? It doesn't go away until I start driving and it seems to do it when the temperature is cooler.

 

Yes it is normal for it to smoke a little at startup. Mine will smoke just abit as it warms and once it builds temp up it will go away. From what I've been told is the #2 diesel is not completely burning. (someone chime in).

 

I don't know if it is or isn't the #2 diesel causing it but my truck also does it. I've always wondered about it thou.

 

Yea,
Mine does it too, just for about 2-3 min after start up. It's normal. It's just a little un-burned fuel. At start up, the fuel that's in the cylinders doesn't get fully burned as the temp in the cylinders isn't quite hot enough to combust all the fuel, hence a little smoke/unburned fuel out the tail pipe. Hope I explained it right !! Good luck !
Chip

 

Great, that's what I was kind of thinking but was a little worried I had done some damage to the pistons or something. I know diesels smoke but thought it was usually black. Thanks.

 

Grayish-white smoke is unburned fuel coming out the tailpipe - you should be able to confirm this by its odor. It's normal until the combustion chamber temperatures come up after a startup. Be sure your grid heaters are working, though, and allow them to go through their cycle (i.e., wait until the wait to start light goes out before starting the engine). If it's extremely cold, plug in the block heater as well. This will minimize the start-up smoking.

Rusty