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Thread: Mass airflow sensor problem?

  1. #1
    Join Date
    Mar 2005
    Location
    usa
    Posts
    17
    My Cars
    BMW 325 Ci sport package

    Mass airflow sensor problem?

    2001 325ci
    138,000 miles
    Standard transmission
    Completely stock, dealer maintained.
    Five days ago the idle started being rough. Two days ago must pump the gas peddle or motor will turn off.
    Unplugged the mass airflow sensor and it runs like new; perfect acceleration; very smooth idle.
    Removed the air filter box and sensor. Air filter and box are very clean. No obvious damage to the sensor or appearance of being “dirty.”
    Sprayed the entire sensor with the cleaner made specifically for cleaning the mass airflow sensor. Let dry completely for one hour and reinstalled. Re-connected the entire system and plugged in the sensor cable.
    No change in the problem.
    Un plug the sensor cable and it runs like new.
    I have Checked all the hoses for damage and can find none. There are no fluid leaks on the motor or under the car.
    I believe that I need a new mass airflow sensor. The OEM BMW is around $450.
    Could the problem be this simple?
    Do you trust a brand other than OEM BMW?
    Thank you for the help. I am not a mechanic !!
    Jim Duke
    Last edited by jimduke; 03-18-2018 at 10:11 AM. Reason: Additional I formation

  2. #2
    Join Date
    Feb 2001
    Location
    NYC/NJ
    Posts
    1,825
    My Cars
    2003 TiAg 325iT
    Quote Originally Posted by jimduke View Post
    2001 325ci
    138,000 miles
    Standard transmission
    Completely stock, dealer maintained.
    Five days ago the idle started being rough. Two days ago must pump the gas peddle or motor will turn off.
    Unplugged the mass airflow sensor and it runs like new; perfect acceleration; very smooth idle.
    Removed the air filter box and sensor. Air filter and box are very clean. No obvious damage to the sensor or appearance of being “dirty.”
    Sprayed the entire sensor with the cleaner made specifically for cleaning the mass airflow sensor. Let dry completely for one hour and reinstalled. Re-connected the entire system and plugged in the sensor cable.
    No change in the problem.
    Un plug the sensor cable and it runs like new.
    I have Checked all the hoses for damage and can find none. There are no fluid leaks on the motor or under the car.
    I believe that I need a new mass airflow sensor. The OEM BMW is around $450.
    Could the problem be this simple?
    Do you trust a brand other than OEM BMW?
    Thank you for the help. I am not a mechanic !!
    Jim Duke
    I've replaced my maf with a siemens/vdo unit that I got from Amazon for 200.00. My OEM maf started to go into a soft fault mode.

    Almost a year of daily driving and no issues.

    Sent from my Nexus 7 using Tapatalk
    eeeks!

    ---"Angelina" '96 328isA S/C (The *sirius* ubercommuter) ERT/Vortech V2SQ with other goodies
    "Man, your car is scary fast...." *Prestige BMW, Jan.18, 2003* (sold )

    ---"theStealth" '03 TiAg 325iT

    ---ZURV1 (Zombie Urban Response Vehicle) 2010 Chevy Surburban

    ---bmwcca member # 179740

  3. #3
    Join Date
    Mar 2016
    Location
    Flowery Branch, GA
    Posts
    20
    My Cars
    2000 323i
    Quote Originally Posted by eeeks View Post
    I've replaced my maf with a siemens/vdo unit that I got from Amazon for 200.00. My OEM maf started to go into a soft fault mode.

    Almost a year of daily driving and no issues.

    Sent from my Nexus 7 using Tapatalk
    I replaced mine recently for around $30 thru carparts.com. Shipping was slow but it was so cheap. It fixed my cel maf code.

    Sent from my LGLS992 using Tapatalk

  4. #4
    Join Date
    Dec 2013
    Location
    Chicagoland area
    Posts
    4,372
    My Cars
    EXOTICS
    Replacement of MAF sensor is not the first step you should be performing.
    • Perform a diagnostic scan.
    • Obtain and record codes displayed.
    • Understand meaning of codes, or post back here for explanations.

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