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Hesitation at 3500-5000 rpm

Discussion in '3rd Gen 4Runners (1996-2002)' started by Torchmanz, Aug 12, 2019.

  1. Aug 12, 2019 at 3:14 PM
    #1
    Torchmanz

    #1
    Torchmanz [OP] New Member

    Joined:
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    2000 Toyota 4Runner
    Hello all,

    I am having a hesitation on my 2000 4Runner(3.4l v6). Whenever it gets past 3k rpm it surges and hesitates. Anyone experienced this before? All help is greatly appreciated.

    It has a fuel filter with about 4k miles on it, and I just replaced the TPS as it was throwing a CEL. I'm thinking the plugs need changing, but I'm concerned it isn't the reason for the problem.

    Thanks all.
     
    Torchmanz, Aug 12, 2019
    #1
  2. Aug 18, 2019 at 8:57 PM
    #2
    Chris98t4r

    #2
    Chris98t4r New Member

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    Have you checked the fuel pump? You said you changed the fuel filter, if that filter was clogged it could have made the pump work harder and could be burning out due to the stress
     
    Chris98t4r, Aug 18, 2019
    #2
  3. Aug 19, 2019 at 4:16 PM
    #3
    Torchmanz

    #3
    Torchmanz [OP] New Member

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    How would I go about "checking" the fuel pump? I'm assuming if the fuel pump was going out it would whine or do other things? Thanks
     
    Torchmanz, Aug 19, 2019
    #3
  4. Aug 19, 2019 at 5:10 PM
    #4
    Chris98t4r

    #4
    Chris98t4r New Member

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    It may not necessarily make any noises, but one way is to check the fuel pressure at the injectors and see if it’s in spec, then rev up the engine and see if it maintains pressure or falls on its face. I’m not sure what the spec is for the pressure but it should be somewhere in the 30-50 psi range
     
    Chris98t4r, Aug 19, 2019
    #4
  5. Sep 2, 2019 at 6:11 AM
    #5
    jross20

    #5
    jross20 New Member

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    Also checch the timing cog for play. I've seen the woodruff key wear a little gap and this play causes the timing to go fubar.
     
    jross20, Sep 2, 2019
    #5
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