Ok I have a 2003 Silverado 2500HD Crew Cab Long Box 2wd and its a great truck. But the truck is still smoking! Every time it idles, the smoke builds up and gets worse and after I starting going, the truck sends out a big puff of white-ish smoke. Its terrible! The truck runs flawless, it has great power, still gets good fuel mileage. What to do.... I know alot of you out there may have a problem similar to mine.... Is it the injectors? Is it the Injection pump? Is it a leak in one of the gaskets? Please help. I need to figure out whats going on. Thanks.

Are you losing coolant?
Is there diesel in the engine oil?
Is the upper radiator hose hard under pressure when up to temp?
If no coolant lose or overflow from the surge tank and no black stuff on the edge floating at the top in the surge tank. I would not say head gasket issue.
Have you had and injector balance rate done? If not get that done and be able to tell if injectors are out.

Brian

Check and check. I had the injectors tested and said the fuel return and pressure return rates are good. At least the dealer says. I haven't checked the coolant.... is a seal possibly going out somewhere?

Headgaskets will create pressure in the cooling system much like a 6.0 Ford. Also, the heat will fluctuate when stopped compared to driving. When mine let go, I had coolant puking much like a the Fords.

Tanc already gave you a great list to start with. Begin there and report back and let us know what you find.

This is what exactly my truck was doing so I took it to the dealer to have the injectors checked. They replaced all 8 injectors under warranty which ran out Dec. 22nd. I was pulled over by PD and given a "fix-it" ticket for the smoking problem at a stop light.

Smoke at idle is a give away of injector ball and seat going bad. GM does not cover this under their warranty. Only cracked bodies.

You should get the test results from your dealer and post them here, both return and balance. There are a few other tests they will perform and with all the results of those tests, we should be able to help you out more.

Yeah i had the injectors tested at a dealer. The service writer told me when i pulled up and said its the injectors. He tells me it will take a week. I go back in a couple of days and then he tells me its not the injectors. I know for a fact that it is an injection problem. Maybe the transfer pump too? The truck runs good with no loss in power and still gets good mileage.... its just when it idles and doesn't move the smoke builds up like crazy. Then when i drive its a big cloud of white-ish smoke.......

No reason why they cannot provide the testing data. I get it especially if you paid for a service fee.

Brian

How many miles are on your truck ? I would Check the turbo.

its got 300,000 miles on it.....

I have a similar problem, but without the white smoke. It just has a light black smoke at idle and goes away under normal driving. Is this the same issue MyChevy12 is having? Also I have 150k. The injectors on mine were changed already. I am running an additive for the winter and b5 biodiesel.

Yeah, it used to go away when I would begin driving. But if it idles for a long time, it will continue to smoke very lightly when at highway speeds. Why does the smoke build up as it idles for a long time....

Is there any other worst case problems or anything?

smoke builds up because you have Carbon build up... Clean those injectors and Most of your smoke will go away to do this I use power service white and silver diesel kleen bottles Both at the same time and use the whole "treats 100 gal" size in the tank at the same time on oem tank and also clean the maf sensor too to make sure air flow is correctly "measured"

Well just ran into same problem, lots of white smoke at idle, goes away when running on road and if I run idle up (2Krpm) it clears also. Runs fine, good mileage. No oil in water or diesel in oil, top hose is soft but will check after a run around town again. 110K on engine, no mods, may tow a car trailer twice a year which used to show the white smoke.
So keep us informed on how your problem is doing.

I have the same problem as Alan, word for word with my 02, 250,000 miles. I think I will try the cleaning additives and would it make any difference if I changed the fuel filter?

Thanks

MIke

Well I tried diesel treatments and it still smokes, but not injector cleaners. Has there been a difference when you use diesel treatments???

I only suggest diesel compliant treatments. Have you tried 2-cycle oil? Some say that helps.

Brian

ok so i just bought an 04 2500 crew cab and the day after i test drove it it started smoking.......when its idling it doesn't smoke at all ?????? every time i touch the gas pedal it lets out an ungodly plume of white smoke, do i need to replace injectors cuz i can think of better ways to spend $1500 ?????? Oh and it has 240,000 on it.... not a bad deal for $7,000 though

ok so i just bought an 04 2500 crew cab and the day after i test drove it it started smoking.......when its idling it doesn't smoke at all ?????? every time i touch the gas pedal it lets out an ungodly plume of white smoke, do i need to replace injectors cuz i can think of better ways to spend $1500 ?????? Oh and it has 240,000 on it.... not a bad deal for $7,000 though

No idea unless you get an injector balance rate done to check them out. Either dealer or someone with a GM Tech II, EFILive Flashscan, or a few of the handheld tuners can read that data off the OBDII port.

Brian

If the injectors are suffering ball-seat wear and are the cause of light idle smoke, are there any damaging long term effects of this? Can the truck be driven until the injectors are replaced, or until it gets bad enough that the owner HAS to do something to stop the visible smoke?

I guess what I'm asking is...are the injectors on the verge of some catastrophic failure at this "idle smoke stage" that could spell engine disaster?

So i tinkered with my truck today after work...Strong smell of diesel and it is leaking off of the motor from somewhere...There is also diesel around the high pressure fuel lines where they go into the valve cover...Any ideas, does this mean anything ???? I think i'm just gonna order the injector kit from pensacola...Anyone heard good or bad about this kit ???

what will an injector balance rate tell me ???

Ok Guy's, word for word exactly the problem I'm having with my 02 LB7. Replaced injectors at 105,000 and it started smoking at 220,000. Have 235,000 now. Truck runs great, slightly rough around 1500 RPM if reved in neutral. Sure hate to put more injectors in it, but it's cheaper than a new truck.