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Old 02-17-2006, 06:14 PM   #1 (permalink)
firedowg
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White Smoke??

Today i let my 05 idle to warm up for about 10-15min. When i took off i noticed alot of white smoke comeing out but it then cleared up. Is this normal Im still new to the whole diesel thing.

Coolent looks like its holding steady. 8500 miles
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Old 02-17-2006, 06:20 PM   #2 (permalink)
lakingslayer
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Take it to the dealer and have them check the balance rates. If they are out of spec (+/- 4mm3 at idle in Park or neutral and +/-6mm3 in drive but still idling) then you may need an injector(s). You also may be able to get away with a reflash. There's a TSB somewhere. Just do a search. Also when checking the balance rates make sure the engine is at operating temp.
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Old 02-17-2006, 06:23 PM   #3 (permalink)
firedowg
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Ok but just to check if it was a head gasket or somthing of that sort it would smoke white all the time? It did it for about 30feet then stoped when i jumped on it, it smoked a little black like normal after wards.
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Old 02-21-2006, 01:23 PM   #4 (permalink)
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How cold was it outside? Believe it or not Diesel engines will steam like a gasser when the outside air temperature drops to the 20* or lower range, usually however the steam will totally disappear after a minute or so of driving. Below 0* I've seen Diesel engines continue to steam just like gassers do while driving.

Just to qualify this, steam like on a typical gasser engine will disappear a few feet from your tail pipe. Smoke on the other hand will linger and can fill a neighborhood

Obviously if you've got white smoke that is lingering you should take the truck to the service dept as that's not normal, if you're just creating a bit of steam for a few seconds as the truck warms up you're probably fine.
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Old 02-21-2006, 02:52 PM   #5 (permalink)
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is that the hot air hitting the cold? and condensing?
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Old 02-21-2006, 03:34 PM   #6 (permalink)
RacinJason73
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The white is most definitely "steam". The combustion process (gasoline or diesel) generates water vapor which quickly condenses in the cold air - hence the white smoke disappearing. I'm having a similar problem except my truck's smoke is not all white ... but has a bluish tint - unburned fuel - you can smell it. It is most apparent after an overnight cold soak and then a 5-10 minute warm-up period. The first several accelerations result in a cloud of blue-white smoke. I followed my wife (about 500-600 ft. back) while she was driving one morning and could smell the unburned diesel inside the vehicle I was driving. My fuel economy has decreased (while I'm at the point of break-in where I should start to see increases), but I'm not sure how much to attribute to winter blend diesel. I first noticed significant white smoke around Christmas time while visiting my parents in Michigan. I took the truck to the stealership, Green Chevrolet, when I returned home to Central Illinois shortly after the turn of the year. They did a software update. It didn't change a thing. I took it in again 2 weeks ago. Again, they did another software update as there was a new one available. This time, I finished the paperwork, received my keys and then, without driving off, I watched in the parking lot as it started to smoke. It was better, but not fixed. I marched straight back into the office and pulled the mechanic back out to the lot with me. He was dumb-founded. Then, he asked why it was idling so high and I explained I turned on the high idle feature for warm-up (IIRC, the owners manual recommends this setting for quicker warm-ups). Said he didn't notice anything at low idle (which is BS, because I've since tried with the high-idle turned off with the same results). He proceeded to say he'd call the GM tech support line and get some information ... and promised he would call me and not "blow me off". However, after a week, I called to talk with him since he did in fact "blow me off" and instead I'm redirected to the service manager. He said they've called into GM and have not gotten a response. He believes it's primarily due to the high-idle feature being turned on and how that works in conjuction with the EGR which is causing the blue smoke. His excuse was that this is an emissions regulated truck and they can't modify the operating parameters to eliminate the smoke. So I tell him, "No S#$T, Sherlock! But I don't think dumping raw, unburned fuel is exactly compliant with those regulations. I don't think it's running right ... I think there's an injector problem!" At that point, he said there was nothing they could do until GM responded with a fix and there is nothing else they can do for me. Upon some testing of my own, it appears as though having the EGR plugged in or unplugged makes no visable difference on the quantity or quality of the exhaust. Also, high idle on or off makes no difference either. Anyone having a similar experience? After hearing a recent story about another Illinois dealership, I'm wondering at the qualifications of the diesel mechanics in this area. Anyone have a suggestion for a reputible dealer in the Peoria Illinois area - other than Green or Leman Chevrolet?
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Old 02-21-2006, 08:21 PM   #7 (permalink)
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Very light blue smoke when cold (at or below freezing) is actually normal with a Diesel, without a kitty you'll see even more. What you are seeing is raw fuel which condensed on the cold surfaces (comparatively) of the block and failed to completely burn upon injection.

Large Diesel engines, tractors, etc. do this as well. The warming strategy on our engine (glow plugs, intake air heater) helps to minimize the amount of fuel which is not fully burned, but no system is perfect. The kitty also makes (at least in my observations) a huge difference in the amount of “cold smoke” you'll see from your Diesel. With cat you may not see any smoke at all, without it you are going to see some possibly a bit more than some.

This smoke SHOULD completely disappear when the engine reaches near operating temperatures, if it does not you probably have a problem.
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05' GMC 2500HD LLY

EFILive - Yeah baby! -
Summit 4" exhaust (kitty ran away during install)
EGR blocked (exhaust belongs in my tail pipe, not my intake )
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Old 02-21-2006, 09:38 PM   #8 (permalink)
firedowg
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awsome thanks guys. I got in it today and its about 30 out and all looked good no smoke.
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Old 02-21-2006, 10:10 PM   #9 (permalink)
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mine has blue smoke when it is cold. when the truck is up to operating temp, no smoke. good luck
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Old 02-21-2006, 10:29 PM   #10 (permalink)
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Mine has alot of white/blue smoke very similiar to RacinJason's - especially if it has sat overnight. My kitty ran away and it has been a right around 0* F in the mornings. Based on Engimas post it sounds normal. I will see what it does this spring when it warms up. Thanks for the info.
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