Cleaning GEMS MAF Mass Airflow Sensor (pics)
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Thread: Cleaning GEMS MAF Mass Airflow Sensor (pics)

  1. #1
    SENIOR ROVER rtkraken's Avatar
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    Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Figured it might be time to give cleaning my GEMS MAF a shot (168K miles). It was really pretty easy. I didn't elect to drill out the rivets and remove the sensor post from the housing tube because it's pretty accessible in it's assembled position.

    Here's the steps as I performed them:
    1) Remove MAF sensor housing assembly from the engine air intake (two clips MAF inlet, hose clamp MAF outlet, squeeze the electrical connector (pushing the wire in) and pull off)
    2) Gently work/pull with fingers the plastic collar inserted in front of the MAF housing intake screen and remove the screen.
    3) Take the housing outside and spray 1/2 a can (at least) into the small tube in the housing.
    (Hold the MAF housing slightly down from horizontal to allow the excess cleaner to drain. The air path through the tube exits out two ports on the underside of the "T" shaped sensor tube post. I was careful to not place the cleaner nozzle into the tube so as to avoid possible damaging of the tiny devices in the tube.)
    4) Let it dry... 1/2 hour or so...
    5) Reinstall the screen and fixing collar into the housing inlet.
    6) Reinstall the MAF sensor housing into the engine intake tubing.

    Diassembled for cleaning


    Sensor cluster before cleaning


    Ready for cleaning


    Cleaning


    After cleaning (note: you can see the color of the devices now)


    Close up of cleaned MAF sensor core devices


    Things didn't really appear too dirty. I've taken the vehicle for a preliminary drive and haven't yet reset adaptive values. The only thing I've noticed is the transmission is downshifting a little "aggressively", so something has changed...

    I'll wait for a couple days till I post a final success note...
    92 Classic (retired) 95 Classic (150K) 95 4.0 SE (160K) 96 4.0 SE (200K)
    07 HSE L322 (70K) 02 4Runner (safety net)

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  3. #2
    SOPHOMORE ROVER
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Hi Folks, Can I use wd-40 to clean the Mass Airflow sensor

  4. #3
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Quote Originally Posted by Edable
    Hi Folks, Can I use wd-40 to clean the Mass Airflow sensor
    Absolutely not.
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  5. #4
    SITE ADMINISTRATOR RRToadHall's Avatar
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Quote Originally Posted by Edable
    Hi Folks, Can I use wd-40 to clean the Mass Airflow sensor
    OMG Oiling your MAF is a big no no. It needs to be spotlessly clean and free from any deposits. WD-40 will have left a nice layer of film on it that will ATTRACT dust and dirt and that booger will pack up faster than a mother in law coming for a visit.
    My mind is aglow with whirling, transient nodes of thought careening through a cosmic vapor of invention.

  6. #5
    SOPHOMORE ROVER
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Thanks Guys,that would have been terrible.but what about methlated spirit(Methyl ethanol)

  7. #6
    SITE ADMINISTRATOR RRToadHall's Avatar
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Quote Originally Posted by Edable
    Thanks Guys,that would have been terrible.but what about methlated spirit(Methyl ethanol)
    I have to admit I misread your first post and thought you had already used WD-40. MAF cleaner is $4 or $5. Just go pick up a can at any parts house adn do it right.
    My mind is aglow with whirling, transient nodes of thought careening through a cosmic vapor of invention.

  8. #7
    SOPHOMORE ROVER
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Guys am in Nigeria,Gone in search of the MAF cleaner,but cant find any, hence my search for a substitute

  9. #8
    Premium Member
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    carb cleaner or electrical contact cleaner, i've used carb cleaner and heard about the elec. contact being used to good effect.
    Larry S
    1995 4.6 HSE

  10. #9
    SOPHOMORE ROVER
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    ok, will get a carb cleaner, thanks

  11. #10
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Sometimes carb cleaner leaves a film. Spray some metal with it first and see if it leaves any residue behind.

    Electrical contact cleaner would be better. Or maybe the carb cleaner followed by a swipe with rubbing alcohol.
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  12. #11
    SOPHOMORE ROVER
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Ok will do, thanks guys

  13. #12
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    good point, it should evaporate away very quickly and leave no film.
    Larry S
    1995 4.6 HSE

  14. #13
    SITE ADMINISTRATOR RRToadHall's Avatar
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    Beter yet, spray some on a window. If you can;t see through the spray area it will leave a film on the MAF.
    My mind is aglow with whirling, transient nodes of thought careening through a cosmic vapor of invention.

  15. #14
    JUNIOR ROVER
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    To carry on - some electrical contact cleaners also contain a lubricant - it should say so on the can somewhere. So pick carefully if you go that route. The idea about spraying it on a window to check for residue is excellent!
    96 RR SE (dead 7/10/12- RIP)
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  16. #15
    SOPHOMORE ROVER
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    Re: Cleaning GEMS MAF Mass Airflow Sensor (pics)

    ITS ALSO VERY IMPORTANT TO ENSURE IT HAS HAD PLENTY OF TIME TO DRY OUT PROPERLY BEFORE REFITTING AND STARTING

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