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Car Forum / Mercedes-Benz Cars / November 2006Smoke at Startup
New convert to the diesel Mercedes fold. I'm the proud new owner of a 1982 300CD-T, and I understand that some smoke is just part of owning these cars. I get some white smoke on startup, but none that I notice otherwise. I run B100 in the car. How do I know if the smoke is normal or excessive? >New convert to the diesel Mercedes fold. I'm the proud new owner of a >1982 300CD-T, and I understand that some smoke is just part of owning >these cars. I get some white smoke on startup, but none that I notice >otherwise. I run B100 in the car. How do I know if the smoke is normal >or excessive? Blue smoke is oil. Black smoke is fuel. White smoke is coolant. Head gasket I'd say.  SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net Don't know about the B100 fuel. White smoke, usually lots of it is a symptom of head gasket failure. Suggest you watch coolant level and if coolant is in the engine oil and / or oil in the coolant. If neither and no coolant loss is observed switch the diesel #2 to determine if the B100 is the cause. The white smoke immediately after startup of which you speak is simply fuel that has accumulated during startup. It should disappear almost immediately but on cold days may hang around for a bit. Also, the new glow plug relays which stay on longer than usual will help eliminate white smoke that occurs until the engine warms up. However, if you have a continuous stream of white smoke you've got oil-in-the-cylinder problems caused by bad rings, valve guides, etc., etc., etc. Again, if the smoke goes away rather quickly don't worry unless you're losing engine oil, coolant, transmission oil, etc. > Don't know about the B100 fuel. White smoke, usually lots of it is a > symptom of head gasket failure. Suggest you watch coolant level and if > coolant is in the engine oil and / or oil in the coolant. If neither and > no coolant loss is observed switch the diesel #2 to determine if the B100 > is the cause. >The white smoke immediately after startup of which you speak is simply fuel >that has accumulated during startup. It should disappear almost immediately [quoted text clipped - 6 lines] >Again, if the smoke goes away rather quickly don't worry unless you're >losing engine oil, coolant, transmission oil, etc. Black smoke is fuel blue smoke is oil white snoke is coolant. SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net >>The white smoke immediately after startup of which you speak is simply fuel >>that has accumulated during startup. It should disappear almost immediately [quoted text clipped - 10 lines] > blue smoke is oil > white snoke is coolant. On a diesel white smoke can also be unignited fuel. A bad cylinder will result in a continuous white plume. BTDT. SignaturePC Paul 89 PC800 77 R100RS Trip pics at: http://pg.photos.yahoo.com/ph/paul1cart/my_photos "To educate a man in mind and not in morals is to educate a menace to society" - Theodore Roosevelt The smoke goes away fairly quickly upon acceleration, and seems to be most prolific when the car has been sitting for a while. I imagine that Ernesto is probably right about it being unignited fuel. Although, since it's heavier the longer the car sits, could it be moisture accumulating in the fuel from the air? > > In article <WAw6h.15577$B31.3...@newssvr27.news.prodigy.net>, > [quoted text clipped - 23 lines] > "To educate a man in mind and not in morals is to educate a menace to > society" - Theodore Roosevelt >The smoke goes away fairly quickly upon acceleration, and seems to be >most prolific when the car has been sitting for a while. I imagine that >Ernesto is probably right about it being unignited fuel. Although, >since it's heavier the longer the car sits, could it be moisture >accumulating in the fuel from the air? Dude, you're burning coolant. You might get a little transparent water vapour coming out your exhaust at the very very beginning but white smoke especially that's heavier after the car site longer sure sounds like a breached head gasket to me. Keep an eye on your coolant level. My guess is it's dropping ever so slowly. And shuoldn't be. SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net >>>The white smoke immediately after startup of which you speak is simply fuel >>>that has accumulated during startup. It should disappear almost immediately [quoted text clipped - 13 lines] >On a diesel white smoke can also be unignited fuel. A bad cylinder will >result in a continuous white plume. BTDT. Can't say I've ever seen that. Just black. Take a pie-pan full of fuel and light it. It burns with black smoke not white. SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net >>>>The white smoke immediately after startup of which you speak is simply fuel >>>>that has accumulated during startup. It should disappear almost immediately [quoted text clipped - 16 lines] > Can't say I've ever seen that. Just black. Take a pie-pan full > of fuel and light it. It burns with black smoke not white. That's because it's burning Richard. UNIGNITED fuel in the exhaust will just give white smoke (actually vapor I think). We used to get this condition on the Contintental AVDS 1790-2A (air cooled, dual turbocharged V-12) engines in M60A1 tanks when one or more jugs (cylinders) would go bad. They would have insufficient compression to ignite the fuel mixture in that cylinder and would come out the exhaust as a white plume. The vapor would also make your eyes water and your lungs hurt! SignaturePC Paul 89 PC800 77 R100RS Trip pics at: http://pg.photos.yahoo.com/ph/paul1cart/my_photos "To educate a man in mind and not in morals is to educate a menace to society" - Theodore Roosevelt White smoke on start-up is usually condensation from exhaust gas. Burning fuel results mainly in CO2 and water. As long as the exhaust pipe is not warmed up the water damp is cooled and can condensate, especially in cold weather. This is normal, cars with long exhaust with relatively large diameter like mercedes will show this more than some other cars. This is not a sign of a failing head gasket. symptoms of water in the engine because of head gasket failure are: Difficult first turn of engine after sitting overnight and lots of smoke if the engine is warm. Small leaks may only result in slowly dropping of coolant level. Other symptoms are oil in coolant and coolant in oil It's interesting how many different opinions there are of this. For the record, the smoke simply smells like biodiesel exhaust, sort of like french fries, and goes away almost immediately after I accelerate out of my parking spot. > White smoke on start-up is usually condensation from exhaust gas. > Burning fuel results mainly in CO2 and water. As long as the exhaust [quoted text clipped - 8 lines] > coolant level. > Other symptoms are oil in coolant and coolant in oil |
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