Black smoke is unburned fuel hitting the exhaust after it has passed through the engine. Diesels need air and fuel to run properly, in a proper mixture. Change your air filter and you might get enough air to burn that fuel. When you really hammer it you probably will still get a little black smoke.

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1985 300D, 237k.
1994 F-350, 6.9 diesel, 5 spd manual, Banks Turbo. 261k.
Sold: 1985 300CD- 267K

I just changed my air filter... but I just noticed the wing nut on the top of the filter housing is missing. and it looks like the bolt isn't long enough to hold a wing nut.

Would that be a problem as long as the three other clamps are holding the housing down super tight?

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85 300CD Turbo "Das Polluter" 230K sold for $3,000

98 BMW 323is

No thats going to just make for an aweful noise. These older diesels are rainforest killers. Expect smoke. You may want to consider moving to synth for the oil.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Why are older diesels rainforest killers? Is this an indirect refernence to global warming due to Co2 emissions? Does smoke kill rainforests?

An old diesel running off of waste vegetable oil or biodiesel is largely carbon neutral. Can't do that with your gas machine, less you run it on biologically produced butanol, which isn't readily available - yet.

Its interesting that the EGR in these older vehicles can be the source of the excessive smoke problem.

[QUOTE=Sveinn;1367434]Why are older diesels rainforest killers? Is this an indirect refernence to global warming due to Co2 emissions? Does smoke kill rainforests?

It is misinformation and nonsense that diesels are rainforest killers. If those diesels owners believed this than those with intergrity would quit driving these rainforest killers!

"Testifying on May 13, 2003 before the US House of Representatives' Committee on Resources, Dr. John Christy, a professor of atmospheric Science and director of the Earth System Center at the University of Alabama, said, "CO2 is not a pollutant. In simple terms, CO2 is the lifeblood of the planet. The vegetation we see around us would disappear,"

Alan Caruba the author of "Warning Signs", published by Merril Press. His weekly column is posted on the Internet site of The National Anxiety Center (anxietycenter.com).

Copyright, Alan Caruba, 2003

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'96 C220 138,000mi, '95 E300D 239,000 mi., '87 300TD 214,000mi '88 6.2 Turbo Diesel Chevy Conversion Van 253,000 mi.