Mechanics

FAILED EMISSIONS- HIGH HYDROCARBONS

1994 Mercury Marquis

Engine Performance problem
1994 Mercury Marquis V8 Two Wheel Drive Automatic 141000 miles

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?
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Jrubioc5447
October 19, 2010.



Could be a lean misfire due to vacuum leaks, injectors, fuel pressure problem to include and engine burning oil thru valves and rings-

Rasmataz
Oct 20, 2010.


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