"Black" smoke would usually be an indication of too much fuel, or "rich",
condition, and/or lack of sufficient air, such as on old carburetor engines
when the choke wouldn't open.
Behold Beware Believe
| While waiting at red lights sometimes when I take off there will be a
| ( sometimes big )
| puff of black smoke, sometimes none. I have had a few different reasons &
| prices quoted, and wonder if I should just trade it in or if it's worth
| keeping and repairing. It has 88,000 miles, and is otherwise in great
| Any ideas about a reasonable cost on repair?