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Rough idle

Discussion in '4th Gen 4Runners (2003-2009)' started by red-brian87, Jun 22, 2023.

  1. Jun 22, 2023 at 2:11 PM
    #1
    red-brian87

    red-brian87 [OP] New Member

    Joined:
    Jan 27, 2023
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    First Name:
    Brian
    Roanoke va
    Vehicle:
    2004 4runner limited v8
    Stock
    I'm starting to get a rough idol and i'm not exactly sure what it is. I Replaced the o2 sensors and the spark plugs and ran injector cleaner in it. I'm looking for some advice to figure it out thanks. It's a 2004 with the 4.7 V8 with 262,000 miles. maybe seafoam?
     
    Last edited: Jun 22, 2023
  2. Jun 22, 2023 at 2:23 PM
    #2
    7Runner

    7Runner New Member

    Joined:
    Feb 13, 2021
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    Vehicle:
    2018 Silver SR5P
    Throttle body? Mass Air Flow?
     
  3. Jun 22, 2023 at 5:37 PM
    #3
    CygnusX-4

    CygnusX-4 Member

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    21 TRD OR
    Check engine light on? Coil failures are common on these engines. Doubt you need sea foam....
    Can you look at fuel trims with scanner?
     
  4. Jun 22, 2023 at 6:58 PM
    #4
    xtremewlr

    xtremewlr New Member

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    Todd
    Tucson, AZ
    Vehicle:
    2003 4Runner V8 Limited 4WD
    Lots with more in the works
    Start with a good cleaning of the throttle body, specifically the butterfly valve. They are notorious for getting gummed up without regular cleaning. Just use brake cleaner sprayed into a rag and open the butterfly valve by hand and scrub top and bottom. Get as much of the black gunk out that you can. Ideally, you would remove it to clean it the most thoroughly but then you need to have a new gasket on-hand to replace the old one.

    I'd also do as previously suggested and clean the MAF while you're at it. Only use MAF cleaner to clean that.

    Also verify that the vacuum lines are in good shape, free of cracks and plugged in securely. There should be a vacuum routing diagram on the underside of the hood you can use to identify them.
     

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