Question about 1992 Lexus Ls 400

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Black smoke why is exhaust blowing black smoke when engine is cold

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Check the oil on the oil cap, make sure you don't have water in there or it could be a blown head gasket.

Posted on Nov 27, 2008

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Could the problem of white smoke when start up in morning be that the cold start sensor could be at fault


White smoke is actually normal Susan. It isn't smoke, it is steam.

White is steam
blue is oil
black is rich mixture

Gasoline contains water at molecular level, and when it burns it condenses through the cold exhaust system as steam vapour. You should find it disappears when the engine and exhaust is warm.

May 12, 2016 | Cars & Trucks

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What is the cause of water dripping out exhaust pipe and engine smoking excessively?


Cold weather right? Dripping is the water condensing from the exhaust gases. The "smoke" is more than likely water vapor, just like your breath in cold weather. If you have smoke (black) in warmer weather, you have an excess fuel problem and won't pass emmision tests. If blue smoke you have oil leaks into the coubustion chamber. Also will not pass emmisions test.

Mar 04, 2015 | 2003 Ford Explorer

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Is there a mechanical problem with my 98 Ford falcon when accelerator pedal is flat to floor and when you release accelerator a puff of black smoke comes from exhaust


Probably not a problem as black smoke is a sign that too much fuel went into the engine. This is especially true when engine is cold and in choke or "cold start sequence".

Jan 26, 2015 | Ford Cars & Trucks

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X-Trail has white smoke blowing out exhaust pipe when I start up


It's normal for cars to do this in cold weather til the engine warms up a bit. If it's not cold you might have a head gasket going bad causing antifreeze to get into the engine.

Mar 28, 2014 | Nissan XTrail Cars & Trucks

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Motor is smoking in my '02 diamante, is it the gasket?


Smoke diagnostic is made by colour.
If u mean pistons head gasket,yes,it can smoke.
White (clear) water vapor.Ceck coolant level.Ceck engine oil colour by dipstick.

Black:runs rech on fuel (fuel filter/fuel lines/fuel mixture...)
Blue (whity):worn pistons rings.

Chears.
Tips:
Whity smoke before warming may be natural on cilli mornings with lot of compressure the engines just blows vapors.
Old oil/fuel residues in the exhaust tubing may blow smoke after heating the engine ,must track problem (...).
Black smoke on hitting the acceleration to the floor may be natural (overcharged) avoid sport driving style.

Sep 29, 2013 | 2002 Mitsubishi Diamante

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My bmw 730d 2004 is blowing out alot of black smoke what does this mean?


Black smoke from the exhaust is an indication of the engine running too rich. Probably bad fuel injection system.

Sep 28, 2012 | 2004 BMW 730

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Why want 6.0 blow black smoke with banks 6 gun iq


Black smoke from a diesel is caused by overfueling, even with a banks the engine obviously is burning the fuel efficiently. Black smoke will not make your truck produce more power, i am not sure why you would want this to happen anyway.

May 29, 2010 | 2006 Ford F 350 Super Duty

2 Answers

White smoke blowing out of exhaust?


black smoke is fuel white smoke is oil. change your spark plugs to a hotter plug and run with some hpr 50 engine oil or somrthing nice and thick

Oct 11, 2009 | 1996 Ford Thunderbird LX

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