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Whats the make/model?? Why did you replace the injector??
If the white smoke is the reason for replacing the injector, and you still have the symptoms, maybe it has dropped a cylinder- low compression on the cylinder, do a compression test, compare with other cylinders...
White smoke is heated fuel not hot enough to combust/burn...
if its black smoke then its a fuel problem too much fuel the car can`t burn it . could be fuel injector over fueling. if its white smoke then its burning coolant, there is a head gasket problem that is damaged in the cyl #3 area. it could also be a bad valve guide/valve seal, oil rings, compression rings. you don`t say what colour the smoke is.
Sounds like a bad head gasket. Check your oil after car sat all night. See if there is white , or any signs of water in your oil. Smell dipstick at the same time to see if there is the smell of gas in the oil. While car is cold check the coolant for traces of oil in the cooling system. , or the smell of gas present. When the head gasket goes,it no longer separates the different ports for oil, coolant, and gas mixtures. What happens is that coolant gets into your engine cylinders where gas, oil, and air mix, and ignite. This causes steam to come out of the tail pipe. If you are going to change it yourself, keep me informed and I can walk you through it. What size motor is in the car?
from what you say, they said," it was the injectors that were faulty",hence changeing them,you could have tried a fuel additive/injector cleaner which could have had the same effect.....try a can to 5 gallons of fuel and if no improvement within 100 miles,give them HELL.smoke from a turbo engine could be dirty fuel/compression low/air leak from the turbo pipes/lazy turbo,etc but this engine is not exaclty the cleanest on emmisions.so expect a SMALL amount of smoke when cold or when accelerating HARD.
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.
If its bluish smoke coming out of the exhaust, then engine oil is leaking past the piston's oil rings. You'll need an engine rebuild, or give its last rites before sending to the salvage yard. If it's white, it should clear up as the engine warms up. White smoke is caused by lack of heat temperature in the combustion chamber. If the engine is warm, and its still smoking (black smoke), then too much fuel is entering one (or more) of the cylinders, which is often caused by a faulty fuel injector. To diagnose which injector is faulty, remove and inspect each spark plug. Any Haynes or Chilton manual has a spark plug section showing what a normal spark plug should look like, versus one caused by faulty injectors.