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Intermittent Sputtering

Discussion in '4th Gen 4Runners (2003-2009)' started by Jax4x4, Feb 19, 2019.

  1. Feb 19, 2019 at 5:09 PM
    #1
    Jax4x4

    Jax4x4 [OP] New Member

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    Hi Everyone! This is my first post so I hope I am able to get some good help. So my 2008 Sport Edition 217K is starting to sputter on occasion. But I have noticed that it is happening more frequent. I tried fuel injection cleaner and changed the spark plugs. Seems like those repairs helped a little but are there any other issues I should try to check?

    Thanks,
     
  2. Feb 19, 2019 at 6:08 PM
    #2
    HoBoDanny

    HoBoDanny Dude...

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    RCI Skid Plate CBI Ditch Light Brackets Hankook DynaPro ATM RF10 265 70R17 113T Tires TPMS Bypass Mod Hydrocarbon Filter Removed Merca decal 2” leveling kit front only Black headlights
    Fuel filter since it seems to be fuel related if the cleaners help
     
  3. Feb 19, 2019 at 9:50 PM
    #3
    Watt maker

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    Disconnect the battery and thoroughly clean the MAF sensor (don't touch the wires inside and let it completely dry before re-installing) and throttle body.
     
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  4. Feb 24, 2019 at 3:34 PM
    #4
    Jax4x4

    Jax4x4 [OP] New Member

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    Changed the air filter, that helped a little but when I cleaned the MAF Sensor that did the trick. My 4Runner got a great tune up in the process. Thanks for your help!
     
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  5. Feb 24, 2019 at 7:09 PM
    #5
    Watt maker

    Watt maker New Member

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    Awesome glad it’s running good again!
     
  6. Feb 25, 2019 at 4:44 AM
    #6
    DGP1961

    DGP1961 New Member

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    What's the "MAF" sensor?
     
  7. Feb 25, 2019 at 5:30 AM
    #7
    RonT4R

    RonT4R New Member

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    MASS AIRFLOW SENSOR, it is mounted on the intake tube prior to the throttle body. It measures the amount of air so the ECU can send the correct amount of fuel to the engine.
     
  8. Feb 25, 2019 at 7:59 AM
    #8
    DGP1961

    DGP1961 New Member

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    Oh thanks...
     
  9. Mar 5, 2019 at 7:10 PM
    #9
    Jax4x4

    Jax4x4 [OP] New Member

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    I'm still having the same issue after new air filter, spark plugs, injection cleaner and cleaned MAF and throttle body. The issue seems to happen around 1500 rpm. Slight stutter but if I accelerate the problem goes away. It is does not happen every time but in getting worse. Thanks again
     
  10. Mar 5, 2019 at 7:43 PM
    #10
    Watt maker

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    Any codes?
     
  11. Mar 6, 2019 at 6:18 AM
    #11
    Jax4x4

    Jax4x4 [OP] New Member

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    No codes, no warning lights.
     
  12. Mar 6, 2019 at 11:43 AM
    #12
    Watt maker

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    Might want to try disconnecting the battery and cleaning the MAF really good again. Also, I would inspect around the MAF and TB for any signs of air in leakage. What spark plugs did you use?
     
  13. Mar 12, 2019 at 9:48 AM
    #13
    Jax4x4

    Jax4x4 [OP] New Member

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    Denso spark plugs. I will try to clean the MAF sensor again. The last time I used 4wd it seemed like my 4Runner was stuck in 4L and took several minutes for it to release back to 2H. Have you ever had this issue?
     
  14. Mar 12, 2019 at 1:25 PM
    #14
    Watt maker

    Watt maker New Member

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    Yes, I've had that issue before. What works well for me is when engaging or disengaging 4low, stop on a slight incline-with the front wheels pointed straight ahead, place the 4runner in neutral, select or de-select 4low, release the brakes and let the 4runner very slowly roll, like 0.25 mph slow. This has worked very good for me over the last few years. I also place the trans in neutral when just selecting 4high. I know the manual says otherwise but it seems to engage quicker and easier this way for me.
     
  15. Mar 18, 2019 at 7:52 AM
    #15
    Jax4x4

    Jax4x4 [OP] New Member

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    How difficult is it to replace the fuel filter? I think this is the next step in my diagnosis.
     
  16. Mar 18, 2019 at 10:56 AM
    #16
    Watt maker

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    It’s in the tank, so not very easy to replace. I would try to get a fuel pressure reading first. Typically, if the fuel filter is clogged you’ll get some lean condition codes to come in. Might try replacing the PCV valve next.
     
  17. Mar 20, 2019 at 7:34 AM
    #17
    Jax4x4

    Jax4x4 [OP] New Member

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    I replaced the PCV valve and it almost seems like the sputtering is worse. It only does it around 1000-1500 rpms
     
  18. Mar 20, 2019 at 12:09 PM
    #18
    Watt maker

    Watt maker New Member

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    That’s weird. Unfortunately, it might be time to take it to a mechanic. I’d look for a independent shop that is familiar with Toyotas or a dealership if their shop has a good reputation.
     

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