So I took the truck in a month ago and when I got it back they said the Injector O-Rings were the reason why my truck was losing coolant. Something about the way they seal and that one was pitted, the others just didnt seal right. Which doesnt make sense.. but then again I know NOTHING about these motors. My biggest concern was that when I start up the truck it would have a big puff of smoke that smelt HORRID like burnt coolant, like a blown head gasket... It only REALLY happens on the days its rainy and droggy outside... It does it for like the first minute or so, but then it goes back to normal.. The truck doesnt feel as peppy to me.. but I do not know... There are no check engine lights, or anything. So I kinda got off a little. I got the truck back from the dealers and immediatly the next day it was raining and it did that smoke crap again.. now I'm back down on Low Coolant again.. it keeps coming up... and it is low, I have been keeping track of it... What do you think is wrong.

injector cup seals.................or a head gasket...........

if the cup seals were pitted, the head is no good....

is this the 04 in your sig we are talking about?

LB7 04.

What do you mean by the head is no good. IE bad head gasket? Or could the deck not be surfaced right?