1996 Pontiac Grand Am LEAN FULL AND RANDUM MISFIRE

Tiny
SPANKY1956
  • MEMBER
  • 1996 PONTIAC GRAND AM
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 104,000 MILES
WHEN GETTING THE CODES ONE IS 300 RANDUM MISFIRE AND OTHER CODE 171 LEAN FULL REAR BANK DO YOU HAVE ANY IDEA WHAT TO LOOK AT TO FIX THE CAR
Wednesday, September 10th, 2008 AT 3:01 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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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Wednesday, September 10th, 2008 AT 3:12 PM

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