Question about Mercury Grand Marquis
First--you gave us no vehicle description
Second-you gave us no drivability issues or problems your having
Third-Why would you drive around one year, with a check light on and codes,that is neglect and abuse
Fourth- PCV Valves-never need to be changed,clean if you like, every four years,they do absolutely nothing. They are only there, to regulate air flow from crankcase to induction. Educate yourself.
Posted on Oct 11, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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Please see my tip at http://www.fixya.com/cars/r7427423-fix_poor_idle_high_idle_stalling_fuel . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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