03 duramax lb7 smoming at idle. Looking for answers

[Dirtydmax86]

Nozzles are but one area. Bodies don't wear out, the ball seat and solenoid ball is what wears out on high milage units. Only a bosch dealer with the required calibration equipment can purchase the required parts to rebuild them completely. Many have bought the diy nozzle kits, and almost all of them end up smoking afterwards.

As to smoke colir, injectors CAN smoke blue. I have actually yet to have an lb7 come to me white smoking needing injectors. I've had one grey smoking, but the majority have been blue smoke. Just did mine for blue smoke. Doing the GM cleaner cleared up most of the blue smoke, but it would randomnly blow out a plume of blue after flushing. Remember, diesel is fuel OIL, and burns by compression same as oil will. Dribbling nozzles can easily cause blue smoke from fuel entering before cylinder heat is high enough, but not enough fuel entering to put the fire out(thats what causes white smoke).

So in that case if its white smoke doesnt mean injector is problem.

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[03blkdmax]

Run ur truck with the valve covers and return lines removed..obviously u have to put high pressure lines back on.. see which if any injector returns a lot of fuel, the return should just kinda bubble a little fuel, not a teaspoon per pulse lol.. if any leak alot, replace with bosch reman and put new nozzles on the rest and u should be good to go, Worked on my lb7

 

[Dirtydmax86]

Run ur truck with the valve covers and return lines removed..obviously u have to put high pressure lines back on.. see which if any injector returns a lot of fuel, the return should just kinda bubble a little fuel, not a teaspoon per pulse lol.. if any leak alot, replace with bosch reman and put new nozzles on the rest and u should be good to go, Worked on my lb7

Im assuming hp lines obviously on and return hose off right.

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[03blkdmax]

Yeah,and if the truck started hard u might have high return rates, but if it popped right off then its probably just nozzles.

 

[THEFERMANATOR]

So in that case if its white smoke doesnt mean injector is problem.

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White smoke can be coolant, or it can also mean the cylinder is getting so much diesel injected in, it's blowing the flame out, then you get the raw diesel turning to smoke in the hot exhaust, and the nasty fuel smelling exhaust.

 

[Dirtydmax86]

White smoke can be coolant, or it can also mean the cylinder is getting so much diesel injected in, it's blowing the flame out, then you get the raw diesel turning to smoke in the hot exhaust, and the nasty fuel smelling exhaust.

Gotcha. Makes lots of sense. Even more when i increased pressure using my snap on scanner.

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