1994 Honda Civic exhaust

1994 HONDA CIVIC
134,500 MILES • 4 CYL • 2WD • MANUAL
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JLCIVIC
  • MEMBER
  • 1 POST
i have a 94 honda civic with headers ans catback exhaust. i have black stuff coming out of my muffler when i first star the car. what is the black stuff and what could cause it?
Jan 28, 2008 at 3:24 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
It's carbon, all cars have it...if it's excessive, is there any black smoke when it's running? If yes its running too rich, or too much gas! 02 sensors may need to be replaced.
Jan 28, 2008 at 3:29 AM
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