2004 duramax LB7
 

My truck currently has 180k miles. Intake and exhaust are all that's done. The previous owner has receipts of having all 8 injectors, cups and fuel rails replaced. The truck starts and runs fine, but at idle out hazes a little white smoke. When i take of it puffs a little smoke then clears up, then at the next light the white smoke is back. I'm not losing coolant and there doesn't appear to be fuel in the oil. I'm a pretty good wrench but not sure where to begin or what else to check. The truck has a glow plug trouble code but I'm not sure exactly which code at the moment. Any help would be greatly appreciated

How long ago were injectors replaced? I would check injector balance rates to start with.

2x

check balance rates

in park/neutral no more then +or-4, and in drive +-6

2004 lb7
 

I'm gonna try to get the balance rates checked this week. After looking the truck over it turns out it's a Cali edition with all epa crap on it. With 4 inch exhaust and an intake. Could be the issue with it smoking?

not likely.

2004 lb7
 

Is it possible to change out my fuel system to the LLy fuel system?.or is that too much of hassle? If i can do it what parts would i need? I have access to ally engine

sure can.

do a whole engine swap, the LLY harness should plug right in.

otherwise if you just wanted the injectors and fuel lines, you will also need the heads and valve covers to go with it. if you are going this far you might as well swap the engines.

04 LB7s and the LLYs should be electrically compatible and "plug and play"

check out this thread from another site, discusses the whole processes
I have seen the impossible! - Duramax Diesels Forum

2004 lb7
 

OK Good deal. I'll see how much i can get the whole motor for but if not then I'm gonna shoot for just putting the lly fuel system in mine