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1999 Saturn SL1 Exhaust system

Tiny
TATATOWNER
  • MEMBER
  • 1999 SATURN SL1
  • 0.8L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 142,000 MILES
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!
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Thursday, June 25th, 2015 AT 10:44 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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
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Friday, June 26th, 2015 AT 2:43 AM

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