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Yes this is correct, you can get important information from the colour of smoke from the exhaust:
Blue/Gray Smoke: Blue/gray exhaust smoke is an indication of oil burning in the combustion chamber. These are possible symptoms and causes:
Valve Seals: Leaking valve seals will cause blue/gray smoke at startup because oil leaks past the seals into the cylinder after the engine shuts down.
Valve Guides: Excessive clearance between the valve stem and the valve guide allows oil to leak past the gap into the cylinder.
Piston Rings: Worn or damaged piston rings will cause blow-by resulting in blue/gray smoke.
Worn Cylinder Walls: Worn cylinder walls cause blow-by resulting in blue/gray smoke.
PCV System: A stuck closed PCV valve will cause excessive crankcase pressure resulting in blue/gray smoke.
Black Smoke: Black exhaust smoke is an indication of a rich fuel condition. These are possible causes:
Fuel Injectors: A leaking or dripping fuel injector will cause a rich fuel condition.
Fuel Pressure Regulator: A stuck closed fuel pressure regulator will cause a rich fuel condition.
Fuel Return: A restricted fuel return line will cause a rich fuel condition.
White/Gray Smoke: White exhaust smoke is an indication that coolant is burning in the combustion chamber. These are possible causes:
Cylinder Head: A crack in the cylinder head (around the coolant jacket) will cause coolant to enter the combustion chamber.
Engine Block: A crack in the deck of an engine block near the coolant jacket will cause coolant to enter the combustion chamber.
Head Gasket: A damaged or blown head gasket will cause coolant to enter the combustion chamber resulting in white/gray smoke coming from the tailpipe.
ENGINE SMOKES BLUE THE ENGINE BURNING OIL DUE TO WORN PISTON RINGS , WORN VALVE GUIDES AND SEAL./ ENGINE SMOKE BLACK ENGINE GETTING RICH FUEL MIXTURE CAUSED BY DIRTY AIR FILTER, WEAK IGNITION SPARK, FAULTY FUEL PRESSURE REGULATOR OR LEAKING FUEL INJECTOR, EVAP CANISTER GAS SOAKED./ ENGINE SMOKING WHITE ENGINE BURNING ANTIFREEZE DUE LEAKING INTAKE GASKET OR BLOWN HEAD GASKET. IF ENGINE HAS A LIGHT WHITE BLUE SMOKE ENGINE BURNING TRANSMISSION FLUID DUE TO A RUPTURE VACUUM MODULATOR DIAPHRAM ON TRANSMISSION.
SOUND LIKE LEAKING HEAD GASKET.ANTIFREEZE IS BURNING WITH FUEL CAUSE SEVERE ENGINE MISFIRE THATS WHY ENGINE SHAKING BAD ITS MISFIRING.TIME YOU NEED A NEW ENGINE WHEN ITS SMOKES HEAVY BLUE SMOKE USE A QUART OF OIL ONCE OR TWICE A WEEK.
The color of the smoke means a lot here. Black Smoke is from car running too rich. Blue smoke is burning oil. White smoke is generally steam in gas engines or can be unburned fuel in a diesel.
From your description this is often from a blown head gasket with water getting in the cylinder so the one cylinder doesnt fire properly which causes the shake. BUT it could also be a bad plug or wire causing the shake and the excess fuel causing the smoke. If this car were in my shop the first thing I would do is pull the plugs and check their condition. This will tell me the exact nature of the problem. If I was still in doubt I would do a compression check on all cylinders with close attention on any whose plugs looked different. You can bet this is a bad problem and the vehicle should not be driven..
Blue smoke is usually oil burnig related. White smoke is due to coolant mixing with the oil. (Head gasket leak) You should have the coolant system pressurized by a garage to see if your system holds pressure. This test will tell a lot. Coolant in the oil is a big problem.
It sounds normal white smoke comes from moisture in the air as it's burned and the air temprature is different. it creates steam they gray smoke is a little harder to decide what it is, normally gray smoke is related to oil burning and black is over fuel, depending on how many miles it has on it it could have bad valve guide seals but would not worry about it.
Smoke usually there's a problem.... Bluish gray smoke means you're burning oil (could be a number of things like piston rings, valve seals)... White smoke means could mean you're burning transmission fluid, or there's a crack in the gasket or engine block.... Black smoke could mean you need your air filter changed, bad fuel injectors, bad distributor cap, ignition coil... I would guess it's probably black smoke coming out of your exhaust from the sounds of your symptoms...