1999 Mercury Cougar maybe clogged cat

1999 MERCURY COUGAR
27,000 MILES • 6 CYL • FWD • AUTOMATIC
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SEAN COMSTOCK
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i have a 99 cougar with a 2.5L and 27,000miles i keep getting bank 1 bank 2 lean codes i have change he intake gaskets and the tp gasket and iam still getting it and iam getting a bad egg smell going up hill what do you think the cause is
May 14, 2009 at 5:49 PM
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RASMATAZ
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A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
May 14, 2009 at 7:12 PM