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1991 Chevy Caprice black smoke

Tiny
RUBENTINA
  • MEMBER
  • 1991 CHEVROLET CAPRICE
  • V8
  • 2WD
  • AUTOMATIC
  • 148,000 MILES
My wagon throws out a puff of black smoke every time I floor the gas pedal then goes away then at a stop sign I try it and it will do it again but it won't do it if I take off smoothly, I changed wires cap, rotor, plugs and fuel regulator, what can it be the engine runs good but will not pass smog as it runs too rich, please help.
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Tuesday, August 26th, 2008 AT 2:36 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
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Tuesday, August 26th, 2008 AT 2:44 PM
Tiny
RUBENTINA
  • MEMBER
  • 2 POSTS
What would be the first thing you would do to figure this out?
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Tuesday, August 26th, 2008 AT 2:53 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the airfilter then fuel pressure could be excessive due to the regulator or clogged return line-
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Tuesday, August 26th, 2008 AT 3:01 PM

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