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  1. #1
    Bald Tire
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    Post Throttle body and MAF sensor cleaning

    Throttle body and MAF sensor cleaning on 3.7l I-5 H3

    It was time to change my air filter so i decided to check the Throttle body and give it a scrub down too.

    I think this took me about an hour to complete. Itís not difficult at all, just take care with the MAF sensor as it is a sensitive piece of equipment.

    To start, the tools i used:
    10mm nut driver
    Phillips screw driver

    The cleaning sprays I used:



    1. Disconnect battery.


    2. Disconnect plug at MAF sensor.


    3. Loosen 2 clips on the air box lid and the hose clamp on the air outlet hose between air box and resonator. I removed the hose at the resonator so that I could remove the air box lid and hose assembly that houses the MAF sensor all together.




    4. With the air intake out of the way you now have access to the vortec resonator. Loosen and remove the 2 bolts (10mm) that hold the resonator to the valve cover and loosen the hose clamp where the short air outlet duct attaches to the TB. With the resonator loose you can swing it out of the way in order to access the 4 bolts (10mm) that hold the TB.



    5. Disconnect the sensor plug and the vacuum hose on the throttle body.



    6. Loosen the 4 TB bolts and remove, holding the TB as it will fall away once the last bolt is taken out.



    7. With the TB removed I took it to the work bench and cleaned it down with the TB cleaner, an old toothbrush, and a lint free rag. what a difference.






    8. With the TB clean I allowed it to dry and attacked the MAF sensor (gently).


    9. The MAF sensor is mounted in the air box lid, where the air inlet hose connects, with 2 Philips screws.


    Removing it is easy, just be sure not to touch any of the inner workings as this is a delicate and expensive instrument. To be safe I didnít touch anything that resides inside the air intake. Sorry about the out of focus pics here. I didnít realize until everything was reassembled.




    10. Spray down the sensor using the MAF sensor cleaner only and allow it to dry thoroughly.


    11. Leaving the MAF sensor to dry, reinstall the TB in the reverse order of the tear-down. Check your gasket where the TB bolts on. Make sure it doesn't need to be replaced and the it is free of debris before installing the TB.


    12. At some point go back to the MAF sensor and secure it back into it's housing.


    13. Might as well replace the air filter and then install the air box lid/inlet hose.


    14. Reconnect battery


    15. Done.
    2009 H3 Adventure.

  2. The Following 16 Users Say Thank You to Boerwarrior For This Useful Post:

    06 H3 (09-20-2013), amrg (08-02-2013), cbetts (08-17-2012), chascoll (12-03-2012), Dennis (02-13-2014), Firesquirt (04-23-2013), Gunner_45 (02-14-2014), H3slate (02-23-2012), Haykal Bafana (07-07-2014), JoshuaL (08-17-2012), Nacho (02-23-2012), Pappibri (02-23-2012), Ron46 (04-18-2013), Schwarttzy (01-09-2014), SickStringC (06-03-2013), WillieMo (04-18-2013)

  3. #2
    Brush raked
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    Nice writeup. I just did this while I was customizing my intake air box.



    http://www.hummer4x4offroad.com/foru...Air-Intake-Mod
    2006 Hummer H3 adventure, 5 speed manual, T-bars cranked, 35" Duratracs , skids, line-x fenders, trail scars
    Knight Metal Works Expedition roof rack with 4 6x9 KC's, 2 mounted ammo boxes, hi-lift mount, and tie downs

  4. #3
    Baja
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    Good writeup. Just did mine about a week ago.. Helped out with idle and better response..
    2008 H3, Leveled, 315/75/16 Goodyear Duratrac's, CBUCP, Air Doc, Aries Brushguard, Rola Roof Rack, Rocky Road Rock Rails, K&N Filter
    Love Life, Live Life, and Love Your Hummer !!!!!!



  5. #4
    Guardian Angel

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    Great writeup. Thanks.


    "Ex Umbris Venimus"

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  6. #5
    El Diablo
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    Nice writeup, best I've seen so far on this.

  7. #6
    a.k.a. "The Jackal"

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    great write up
    Squeaky3:06 H3: Blacked out with red accents. 35's, Rancho lift front, Custom spring over! , rear locker, 4:1 Transfer case, gobi, dual spares, Steelcraft brushguard w/ smittybilt xrc10 and a bunch of other stuff....

    "H3 front axles are like drunk cheerleaders....just use em until they get mouthy...then toss em and get another." -anonymous


  8. #7
    Chapter President

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    Reminds me I need to do a little TLC on the H2.
    B I G 2 D A B A N K

    2005 H2 SUT, Desert Sand

  9. #8
    Needs a sponsor

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    Re: Throttle body and MAF sensor cleaning

    Thanks for the write up, ended up doing this today and now my truck is purring like a kitten.

    Sent from my DROID RAZR using Tapatalk 2
    -Griff

    2007 Hummer H3 I5 Adv/lux, 33'' BFG KM2's, CBPhoto front winch shelf, Smittybilt COMP Series 10000 ilb winch, Custom Fuel Rack.

  10. #9
    NERD!!!

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    My truck just started to throw a P0171 code. Time to follow your procedure!
    2006 Hummer H3 / Adventure / 5 Speed / No Bling
    2006 Pontiac Solstice
    2013 Kia Soul+

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  11. #10
    NEVERENDING ADDICTION
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    Looks like I'm going to be doing a little TLC on my H3 now.


    06 Hummer H3
    Rancho 4'' lift
    18'' KMC Hoss wheels
    325/65r18s Fierce Attitude MT's
    ThorParts front bumper
    Daystar Upper Dash Panel
    Custom Brush Guard

  12. #11
    NERD!!!

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    My throttle body was a tad bit dirty:


    I think I found the source of the grime. Looks like a lot of oil has been reaching the vapor recovery tube.


    I guess the steep hills have caused the engine to inhale a little oil. Maybe I am suffering from the same issue as Alex with the burning oil on extreme climbs. You can see more evidence in the AirDoc:


    I spent some time with some cleaner and got it all prettied up. I even sprayed some cleaner on a rag to wipe out the inside of the intake manifold a bit.


    After reassembly, I shot some MAF cleaner into the MAF and let it dry. Not to noticeable on the test drive afterwards. The computer was acting weird and kept the engine running at 2500 RPM until I came to a stop. After driving around for about fifteen minutes, the problem went away.
    2006 Hummer H3 / Adventure / 5 Speed / No Bling
    2006 Pontiac Solstice
    2013 Kia Soul+

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  13. #12
    NERD!!!

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    I am having issues with the truck keeping the RPMs up. As I approach stop signs, I pop it into neutral and coast the last few feet. The truck insists at keeping the RPMs around 2000 until I am at a full stop. My ScanGauge is showing the TPS reacting the same as the RPMs. The only thing I did was clean the throttle body and MAF. Nothing else.

    Opinions?
    2006 Hummer H3 / Adventure / 5 Speed / No Bling
    2006 Pontiac Solstice
    2013 Kia Soul+

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  14. #13
    Needs a sponsor

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    Re: Throttle body and MAF sensor cleaning

    Crazy I thought I was alone for a long while. I just cleaned the throttle body... Definitely alot better, I was thinking maybe the tranny was going. Something like a clutch for a manual, because when I relieve the engine of stress it seems to calm down and steady. The AC also can have the same effect if running. Idk what it is but it's common for the H3 to rough idle.... Got me, a buddy was thinking it's along the line of a electronic problem... Idk where to start

    Sent from my DROID RAZR using Tapatalk 2
    -Griff

    2007 Hummer H3 I5 Adv/lux, 33'' BFG KM2's, CBPhoto front winch shelf, Smittybilt COMP Series 10000 ilb winch, Custom Fuel Rack.

  15. #14
    NERD!!!

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    One thing to add to the list . . . disconnect the battery for a night to reset the computer. Once I did this, normality was restored. I also noticed improvement in power comparing to how it ran before the TB cleaning.
    2006 Hummer H3 / Adventure / 5 Speed / No Bling
    2006 Pontiac Solstice
    2013 Kia Soul+

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    Brotherhood of Handshakers Charter Member #2

  16. #15
    Street Tire
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    Great write up... Does this really alter / change things that much?

    Chris


 

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