1991 Buick Park Avenue Code 44

1991 BUICK PARK AVENUE
160,000 MILES • 6 CYL • FWD • AUTOMATIC
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SHERMANCOX3RD
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  • 7 POSTS
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
Jan 17, 2008 at 1:25 AM
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RASMATAZ
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  • 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)
Jan 17, 2008 at 3:15 AM
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SHERMANCOX3RD
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  • 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 :?:
Jan 17, 2008 at 9:09 PM
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