TwinTurbo.NET: Nissan 300ZX forum - I agree with black soot being related to running rich.
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Subject I agree with black soot being related to running rich.
     
Posted by 300ZMang on March 22, 2013 at 10:10 AM
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In Reply To White smoke out the exhaust (along with black soot)..reason? posted by NismoDHS on March 19, 2013 at 10:25 AM
     
Message During warmup the car runs richer than usual. Just by letting your car idle to warmup isn't doing the same thing as taking it for a light drive, then driving normally once up to operating temp.
Are you sure your "white" smoke isn't burning oil (which would not be exactly white). If it is white, it's either coolant (which would smell sweet as indicated by others) or is condensation.
I'd start with small maintenance first, that way you at least know those parts are on the up-n-up (fuel filter, FPR, spark plugs, etc.)

     
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