1994 Mercury Marquis Failed Emissions- High Hydrocarbons

1994 MERCURY MARQUIS
141,000 MILES • V8 • 2WD • AUTOMATIC
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JRUBIOC5447
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  • 1 POST
Can anyone tell me what it may-be besides spark plugs and coil pack cause I replaced them. Then I checked the cats and both good. Is there anything else I can do?
Oct 19, 2010 at 6:45 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Could be a lean misfire due to vacuum leaks, injectors,fuel pressure problem to include and engine burning oil thru valves and rings-
Oct 20, 2010 at 7:41 AM
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