1999 Saturn SL1 Exhaust system

1999 SATURN SL1
142,000 MILES • 0.8L • 4 CYL • FWD • AUTOMATIC
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TATATOWNER
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Was told by the smog place to get another catalytic converter because it wouldn't pass emissions. There is also black smoke coming out the exhaust pipe. Its kinda loud, like it needs a muffler. My eyes keeps looking at a box under the hood. I'm assuming it's the computer box.
Please help me!!
Jun 25, 2015 at 10:44 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Black smoke is a sign of a very rich mixture being burnt, you may have a leaking fuel injector or a faulty fuel pressure regulator, I would get the fuel rail pressure tested first, to see if the regulator is faulty, have a pressure gauge fitted, watch the pressure reading, disconnect the reg vacuum line if the reading goes up the reg is working
Jun 26, 2015 at 2:43 AM
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