black smoke

2000 HYUNDAI ACCENT
Avatar
YASIRMEHMOODRAJA
  • MEMBER
  • 2 POSTS
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
Aug 7, 2011 at 6:51 PM
Advertisement
Avatar
KHLOW2008
  • CAR REPAIR CONTRIBUTOR
  • 41,814 POSTS
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 at 9:57 PM
Avatar
RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
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 at 10:03 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.