1992 Pontiac Grand Prix Black smoke and large gas consumpti

1992 PONTIAC GRAND PRIX
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AMICHAEL
  • MEMBER
  • 1 POST
1992 Pontiac Grand Prix Automatic 84000 miles

Why does black smoke come out of car and its burning a lot of gas
Jul 6, 2010 at 6:10 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
It's running rich, too much fuel. Either the injector(s) are stuck, or the O2 sensors are in need of replacement, or the CTS (Coolant temp sensor).
Jul 6, 2010 at 6:13 AM
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