2000 Hyundai Accent

Check engine light is not comming also I take my car to work shop last week for serviceing but stil black smoke is comming some time when I accelirating my car is missfiring
August 7, 2011.

Please reply to your previous post as a new post is considered a new question and whom ever repoied to your previous question would not be notified.

Check the fuel pressure. Check the sparks, if they are weak, the ignition coils could be bad. Check the ECT.

Aug 7, 2011.
More fuel than air-rich mixture

Probable causes of an engine running rich are as follows: 1. Fuel pressure not within specs. Can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.

Aug 7, 2011.