Every morning when I start the cold engine of my old Honda, especially in
the winter, the car started hesitantly and I can smell the unburnt gas. To
keep the engine running, I have to keep pressing the gas pedal until rpm can
itself sustain at 2k to 3k. When this car is new, the process took about two
minutes and I don't need to press the gas pedal, now it takes five minutes
or longer in cold days. The car acts normal after the five minutes of my
morning blue is over. Also, the emission is somewhat blackish in that first
five minutes. The emission turns to normal white steam after the rpm hits 3k
then drops to normal 1k instantly. Does anyone know what causes the problem,
and is it expensive to fix? Thanks.