smoke color question
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Junior User
Joined: Jan 2010
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From: Nap town
smoke color question
i have a 93 7.3 idi n in the morning around 50 degrees my truck blows white smoke but in afternoon around 70-80 degrees it blows black as can be and when its sitting no matter what the temp is it blows black and sometimes when its hot it blows white but usually only when its cold out is the white smoke normal in the mornings
Postmaster
Joined: Apr 2009
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From: Malahat/Cowichan Valley
Do you mean at idle or rolling the throttle? When it is cold it is normal to see a bit of light colored smoke but it shouldnt last but a couple seconds, when hot rolling black is a sign of either not enough air, or the IP is cranked up a couple flats. Okay so check the air filter to make sure it is good and no restrictions. My guess is that the IP might be up a couple flats.
Methanoholic
Joined: Mar 2009
Posts: 6,442
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From: Maine (NorCal Native)
White smoke is either coolant or superheated unburnt fuel (Not enough heat to burn it) ...
You need to smell the smoke to determine if it's coolant (sweet smelling) or fuel (Diesel smell).
Hows your Glow Plugs, without enough heat at startup Diesels will produce white smoke.
-Enjoy
fh : )_~
You need to smell the smoke to determine if it's coolant (sweet smelling) or fuel (Diesel smell).
Hows your Glow Plugs, without enough heat at startup Diesels will produce white smoke.
-Enjoy
fh : )_~
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Junior User
Joined: Jan 2010
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From: Nap town
in the morning wen its 50 degrees gowing down the road it blows white but if its sittin there i can hit the throttle and roll black smoke the ip is turned up a little bit and when its warm out it rolls coal
Postmaster
Joined: Apr 2009
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From: Malahat/Cowichan Valley
its spraying more fuel than you are burning from the sound of things. If you are rolling black coal then its way over fueled. Turning the nut back on the rear of that ip will help with fuel output and doesnt require wrenches. Do you have a pyro? If not i would get one asap. I shudder to think about rolling coal without a pyro haha. What does the exhasut in the am smell like? Does it burn your eyes and smell of raw fuel?
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Junior User
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From: Nap town
it smells like diesel but the funny thing is in the am when the smoke is white if i give it a little throttle goin down the road it becomes black smoke
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Postmaster
Joined: Apr 2009
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From: Malahat/Cowichan Valley
Well i am no genius or engineer but i believe that the chamber gets hotter with increased rpm, hence the need for a pyro when the fuel is turned up. You can melt a piston without boiling the rad over. The temp gets way hotter in there first, then the radiation effect of heat heats the water, then gets cooled and so on. If it is white in the am but turns black when warm or at high throttle, you are just overfueled imho.
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