R56 Mass Airflow Sensor

Discussion in 'Tuning and Performance' started by Homazur, Oct 6, 2020.

  1. Homazur

    Homazur New Member
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    So I stalled at a light because engine idling was up & down put it in neutral and started back up then drove to work ~ lunchtime it threw a code mass airflow sensor so I did some research and maybe it’s time for solenoid / actuator? Or Throttle body or all 3
    I have all new plugs and coil packs already any recommendations? It seems like it wants to cut out when come to a light and then it wants to go go go ?
     

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  2. MCS02

    MCS02 Moderator
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    How many miles has it been sense you had the intake walnut blasted? That is also a sign of carbon build up. It may also be the MAS.
     
  3. Homazur

    Homazur New Member
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    Update so sensor changed rock auto $67 and changed and seems so far so good and code clear and no erratic idling and take offs are Thunderbirds Go!
     
  4. Homazur

    Homazur New Member
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    Tuesday next week I’m doing the two VVT solenoids because I threw another code again and everything else is good and I’m thinking that 119k it’s time to pull them out and look too see if gunked up? She’s running super but idle is up and down sometimes not all the time~~
     

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  5. MCS02

    MCS02 Moderator
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    What year is your Mini? If it is a gen2 S they need the intake walnut blasted about every 40k. If the valves are getting build up it will start by having idle issues once it gets bad enough it will have a valve stick then it’s bad news
     
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  6. MCS02

    MCS02 Moderator
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    I should say if it’s N14 motor
     
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  7. cristo

    cristo Well-Known Member

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    #7 cristo, Oct 21, 2020 at 6:56 AM
    Last edited: Oct 21, 2020 at 7:05 AM
    I’m having a recurring 2B5C (P115C) code.
    Trying to sort out between MAF sensor,
    throttle body, vacuum leak, or carbon on
    valves (44 K miles) at the moment.
    No other codes. Only threw a CEL
    (P115C) once, but the pending 2B5C
    comes up more and more often when
    I scan for pending codes.
    Runs great, steady idle, and better than
    usual mpg, (although there may be other
    reasons for that last item).
     
  8. cristo

    cristo Well-Known Member

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    #8 cristo, Oct 21, 2020 at 8:37 AM
    Last edited: Oct 21, 2020 at 9:18 AM
    Will first try a new MAF sensor, then a new
    TB, then pull the intake manifold off and
    get the borescope out to look at the intake
    valves**, then maybe get an inexpensive smoke
    machine to see if there’s an occult leak or crack
    that has escaped my notice so far*.
    Hopefully it will get sorted out well before
    I get very far down that list.

    Other suggestions are welcome.

    *have already replaced the cracked plastic hose
    from the filter box to the turbo intake as well
    as the noisemaker delete and the resonator
    delete and BSH pvc hose plug and OCC and
    new oem diverter valve and all those hoses and
    connections are good)

    **has had oil changes every 5K forever and
    seafoam treatment through the vacuum hose to
    the intake manifold before each of the last 3
    oil changes, and OCC last 15K so intake valves
    probably aren’t too bad.
     
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  9. MCS02

    MCS02 Moderator
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    #9 MCS02, Oct 21, 2020 at 10:20 AM
    Last edited: Oct 21, 2020 at 10:29 AM
    If you have been doing the seafoam treatment then your valves may not be too bad. The long hard plastic tube that goes from the intake to the turbo get cracks from age maybe check that also.
    Intake.jpg
     
  10. cristo

    cristo Well-Known Member

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    Do you mean from the intercooler
    exit towards the throttle body?
    I already replaced the one from the intake
    filter housing to the turbo inlet.
    Do you take off the lock bridge to
    get to that (big U shaped metal part
    that goes over it in the photo)?
     
  11. Crashton

    Crashton Club Coordinator

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    I thought those tubes got softer with age? ;)
     
  12. MCS02

    MCS02 Moderator
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    different tube, getting old is not for the faint of hart.:D
     
  13. MCS02

    MCS02 Moderator
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    I am sorry, yes the one from the intercooler. Yes I did take off the lock bridge.
     
  14. Homazur

    Homazur New Member
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    Kewl I’ll definitely look into doing that while I’m updating the solenoids
     
  15. cristo

    cristo Well-Known Member

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    Might just run a borescope down that tube
    since it’d be less bother to do.

    Sorry, Homazur, I seem to be hijacking
    this thread.
     
  16. Crashton

    Crashton Club Coordinator

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    Borescope down my tube. Oh Hellz No! :Dead:
     
  17. Metalman

    Metalman Well-Known Member
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    By chance, do you have one of those so called "performance" air filters that gets re-oiled after a filter washing?

    Over saturating the air filter with the oil can cause issues with the proper operation of the mass airflow sensor...
     
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  18. cristo

    cristo Well-Known Member

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    Nope, stock oem filter.
     
  19. MCS02

    MCS02 Moderator
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    Chuck at our age you know we ave to get a borescope every now and then:eek::D
     
  20. cristo

    cristo Well-Known Member

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    I’ve had 4 so far (2 screening colonoscopies and 2 cystoscopies related to kidney stones).
     

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