Audizine - An Automotive Enthusiast Community

Results 1 to 19 of 19
  1. #1
    Established Member Two Rings
    Join Date
    Jan 02 2010
    AZ Member #
    52848
    Location
    PA

    symptoms of bad maf sensor?

    Guest-only advertisement. Register or Log In now!
    I have a 02 3.0. My Cel keeps coming on as a steady light not flashing at all. Some of the codes are random mis firing. I think one might have been something with the cooling system. My euro mechanic told me it might be a bad maf sensor. What are the symptoms of this? I don't have any of the codes on hand.

  2. #2
    Veteran Member Four Rings Audi Skate Snow's Avatar
    Join Date
    Mar 31 2004
    AZ Member #
    1504
    My Garage
    C300 Sport and tools
    Location
    CA

    well the easiest way to check if a MAF is bad.

    Start the car
    Pop The hood
    Unplug the maf.

    If the car idles the same with no difference.... then your MAF is probably bad.
    If the car starts to shake and idles funny... then your MAF is probably fine.
    BetaAlphaTau member #1.5
    R.I.P B6 A4!!!!!! 12/03/2005 12.63@108... stock 1.8 motor W/ GTRS.
    B6 A4 Avant, 2.0 Liter, 3071, Maestro

  3. #3
    Established Member Two Rings
    Join Date
    Jan 02 2010
    AZ Member #
    52848
    Location
    PA

    I just got my cel turned off, so if i unplug it will my cel come back on?

  4. #4
    Senior Member Three Rings Dubdaze's Avatar
    Join Date
    Jan 20 2010
    AZ Member #
    53647
    My Garage
    03 a4 1.8t
    Location
    Tampa Fl

    Quote Originally Posted by Audi Skate Snow View Post
    well the easiest way to check if a MAF is bad.

    Start the car
    Pop The hood
    Unplug the maf.

    If the car idles the same with no difference.... then your MAF is probably bad.
    If the car starts to shake and idles funny... then your MAF is probably fine.
    Every vw/audi ive seen runs perfect with the Maf unplugged..

    If the maf is bad and the car runs bad then when you unplug the maf the car will run better

  5. #5
    Veteran Member Three Rings b4a41point8t's Avatar
    Join Date
    Jun 06 2009
    AZ Member #
    43391
    My Garage
    B8 A4 2.0TQ
    Location
    Los Angeles, CA
    Items for Sale

    ^ from my experiences they don't run the same. Similar but noticeably different/bad. Try the maf test and go from there. Do you have vagcom for data logging? That's the easiest test.

  6. #6
    Established Member Two Rings
    Join Date
    Jan 02 2010
    AZ Member #
    52848
    Location
    PA

    Quote Originally Posted by b4a41point8t View Post
    ^ from my experiences they don't run the same. Similar but noticeably different/bad. Try the maf test and go from there. Do you have vagcom for data logging? That's the easiest test.
    Unfortunately i don't. I bought a crappy $20 ebay one. worked for one time, now it wont work.

  7. #7
    Veteran Member Four Rings Audi Skate Snow's Avatar
    Join Date
    Mar 31 2004
    AZ Member #
    1504
    My Garage
    C300 Sport and tools
    Location
    CA

    Quote Originally Posted by Dubdaze View Post
    Every vw/audi ive seen runs perfect with the Maf unplugged..

    If the maf is bad and the car runs bad then when you unplug the maf the car will run better
    you will pretty much notice no change if the maf is bad and then you unplug it. the computer then gets reading from MAP sensor when MAF sensors go out. If your MAF is good with no problems... and you unplug the MAF while the car is running then with out a doubht.... 100% for sure your car will idle like shit.
    BetaAlphaTau member #1.5
    R.I.P B6 A4!!!!!! 12/03/2005 12.63@108... stock 1.8 motor W/ GTRS.
    B6 A4 Avant, 2.0 Liter, 3071, Maestro

  8. #8
    Established Member Two Rings
    Join Date
    Jan 02 2010
    AZ Member #
    52848
    Location
    PA

    Ok i just unplugged it, it seems to run a bit worse. my esp light came on. Now i plugged it back in esp light is still on, and cel just turned on .its running like its unplugged. What the hell happened?
    Last edited by scaudi; 11-22-2010 at 05:31 PM.

  9. #9
    Veteran Member Four Rings A4SoftWalker's Avatar
    Join Date
    May 13 2008
    AZ Member #
    28744
    My Garage
    02A4 1.8TQMS, 05V70R, BMW535i
    Location
    NoCal - EBay

    Give it time to re-adapt - stop engine - restart its not a video game.

    U might need to disconnect battery to reset the ECU.
    'SOFTWALKER MODS
    Do u have the Bentley or Dealership Manual & Tools it takes to work on YOUR car properly? Or...
    Are u just going to continue to wing it & keep expecting manna to fall from AZ?
    Apikol>Snub/Diff APR>ExhTIP-TB hoses,Stg3 AWE>DV
    JHM>ShortShift-the works
    Misc> 18x8x9 235/265;HSport S4 barsTT225;Bosch-F6DTC;CarbonioV2+V6Intake Inlet;HFC;Podi-P2;ATP mani;GPopK04;034mounts
    SPEC>Stg3+,LWFW
    STaSIS>328/305mm,40/60,SL
    Personal Motto>Walk Softly Carry a Big Stick

  10. #10
    Established Member Two Rings
    Join Date
    Jan 02 2010
    AZ Member #
    52848
    Location
    PA

    disconnect the MAF cable with the car on and then plug it back in. Turn the car off and then turn the key in the "ON" position (the furthest position without turning the car on) for 2 minutes. Then start your car and drive it a couple miles.

    The ESP light may still be on but should go off during driving or after the next time you start your car and drive again. You can't always just turn the car on and off as the ECU needs to have consistent readings from the MAF to signal the light to turn off.


    Thats what i had to do to fix it. after i drove for a few miles esp went off and car ran fine again.

  11. #11
    Veteran Member Four Rings Audi Skate Snow's Avatar
    Join Date
    Mar 31 2004
    AZ Member #
    1504
    My Garage
    C300 Sport and tools
    Location
    CA

    yea ESP light will go off after it cycles. on a good note it doesnt seem your MAF is bad if it started idling like shit
    BetaAlphaTau member #1.5
    R.I.P B6 A4!!!!!! 12/03/2005 12.63@108... stock 1.8 motor W/ GTRS.
    B6 A4 Avant, 2.0 Liter, 3071, Maestro

  12. #12
    Established Member Two Rings
    Join Date
    Jan 02 2010
    AZ Member #
    52848
    Location
    PA

    Yeah i dont think so. When i took it for a ride and stop my car would shut off/almost shut off or stand around 500rpms then steady at about 800 or so

  13. #13
    Senior Member Three Rings teg2audi's Avatar
    Join Date
    Apr 23 2008
    AZ Member #
    28034
    My Garage
    2004 Audi A4 1.8t
    Location
    Portland, OR

    i'm guessing vacuum leak. If the ideal is shit and jumps around that would be my first guess. No boost gauge by chance?
    Black 04 Audi A4 1.8t
    APR Stage 2+, tt injectors, forge 007, South Bend OFE Stage 3 Clutch, APR Snub, Podi, Test Pipe

    Member # 15 of Coalition of The OEM+ Audi Owners.

  14. #14
    Established Member Two Rings
    Join Date
    Jan 02 2010
    AZ Member #
    52848
    Location
    PA

    my car has no boost. its a v6 3.0. and my car only did that while my maf was disconnected/being reset.

  15. #15
    Veteran Member Three Rings BerNur's Avatar
    Join Date
    Jan 31 2009
    AZ Member #
    38122
    Location
    Tampa FL / Astoria NY
    Items for Sale

    sorry to thread jack.. but is there a main reason a maf would go bad? or just a life span?

  16. #16
    Veteran Member Four Rings Audi Skate Snow's Avatar
    Join Date
    Mar 31 2004
    AZ Member #
    1504
    My Garage
    C300 Sport and tools
    Location
    CA

    Quote Originally Posted by BerNur View Post
    sorry to thread jack.. but is there a main reason a maf would go bad? or just a life span?
    lifetime... and mostly just dirt particles building up on the film. A lot of times you can clean them and they will be fine again. The only real way to tell if a MAF is on its way out is to log it and see if it is getting the correct readings it should be (correct for turbo you have or software)
    BetaAlphaTau member #1.5
    R.I.P B6 A4!!!!!! 12/03/2005 12.63@108... stock 1.8 motor W/ GTRS.
    B6 A4 Avant, 2.0 Liter, 3071, Maestro

  17. #17
    Veteran Member Four Rings Audi Skate Snow's Avatar
    Join Date
    Mar 31 2004
    AZ Member #
    1504
    My Garage
    C300 Sport and tools
    Location
    CA

    Quote Originally Posted by teg2audi View Post
    i'm guessing vacuum leak. If the ideal is shit and jumps around that would be my first guess. No boost gauge by chance?
    That is my next guess. Although it would be a lean code that would probably just stay on constant until fixed/cleared. Could be plugs or a list of possibilities. hard to tell with out being with the car and checking it out.
    BetaAlphaTau member #1.5
    R.I.P B6 A4!!!!!! 12/03/2005 12.63@108... stock 1.8 motor W/ GTRS.
    B6 A4 Avant, 2.0 Liter, 3071, Maestro

  18. #18
    Active Member Two Rings leo536's Avatar
    Join Date
    Mar 12 2009
    AZ Member #
    39784
    My Garage
    B6 A4
    Location
    Dallas, TX

    Quote Originally Posted by Audi Skate Snow View Post
    That is my next guess. Although it would be a lean code that would probably just stay on constant until fixed/cleared. Could be plugs or a list of possibilities. hard to tell with out being with the car and checking it out.
    Ok, so I'm also having a similar issue with the idling, misfires, car rpms dropping and almost the car dying (some cases it would.) What else could go wrong to cause this? With my 02' 3.0L, spark plugs and gaskets were recently changed, and the coil packs were changed maybe about a year ago due to a recall. If this is helpful, when I had my MAF plugged in, you could hear a thumping noise coming from the intake, kinda sounded like the throttle was gasping for air, but after awhile it faded. And after reading this, I think my MAF might just be bad, because there is no difference in the idling when I have the MAF plugged in and unplugged.
    02 Audi A4 3.0

  19. #19
    Registered Member One Ring Skinnyskins's Avatar
    Join Date
    May 06 2013
    AZ Member #
    114684
    Location
    Ogden, Utah

    Sorry for this, but my car has stalled out and I don't think I'm getting the proper mileage. Not to mention it doesn't have the original gas cap from Audi. That's when the light started coming on.



Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


    © 2001-2014 Audizine, Audizine.com, and Driverzines.com
    Audizine is an independently owned and operated automotive enthusiast community and news website.
    Audi and the Audi logo(s) are copyright/trademark Audi AG. Audizine is not endorsed by or affiliated with Audi AG.