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1991 Buick Park Avenue Code 44

Tiny
SHERMANCOX3RD
  • MEMBER
  • 1991 BUICK PARK AVENUE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 160,000 MILES
Hi I have a problem with my car.I self troubleshoot the code and it read code 44 lean exhaust.I replaced the oxygen sensor and engine code still appear to be code 44 what else can cause this code. Car act like it want to die out when starting it stumbles while idle could it be the MAF sensor causing the problem are what please help.



Thank You
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Thursday, January 17th, 2008 AT 1:25 AM

2 Replies

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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Thursday, January 17th, 2008 AT 3:15 AM
Tiny
SHERMANCOX3RD
  • MEMBER
  • 7 POSTS
I check everything and found out that when I disconnect the MAF sensor WHILE ENGINE RUNNING the car stop hesitating but engine light comes back on for MAF sensor.I don't understand car runs good when the MAF DISCONNECTED CAN THAT BE THE REASON WHY I GET CODE 44 OXYGEN SENSOR :
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Thursday, January 17th, 2008 AT 9:09 PM

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