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2002 Jeep Liberty Black smoke

Tiny
BUDDYSS
  • MEMBER
  • 2002 JEEP LIBERTY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
I changed plugs, tps getting a code of p 171 (lean bank 1) I reset codes and drive a while and same code shows up when I hit the gas peddle hard black smoke from tail pipe like diesel LOL. And really hard on gas should I replace the passenger side o2 sensor?
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Thursday, April 23rd, 2009 AT 6:31 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0171 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
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Thursday, April 23rd, 2009 AT 6:36 PM

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