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Bucking at low speed after warm-up

Discussion in '3rd Gen 4Runners (1996-2002)' started by dkm3033, Jan 10, 2020.

  1. Jan 10, 2020 at 7:27 AM
    #1
    dkm3033

    dkm3033 [OP] New Member

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    I have a 2000 4Runner with 427,000 + miles original engine and trans. It bucks in 2nd & 3rd gear. Not as bad at higher speeds, but can tell during deceleration/acceleration. Engine light sometimes, but doesn't last long. Any ideas?

    dkm
     
  2. Jan 10, 2020 at 7:31 AM
    #2
    4scooter19

    4scooter19 New Member

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    Scan for codes
     
  3. Jan 10, 2020 at 7:46 AM
    #3
    dkm3033

    dkm3033 [OP] New Member

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    Thanks. I will scan once the light comes on again.
     
  4. Jan 10, 2020 at 7:54 AM
    #4
    4scooter19

    4scooter19 New Member

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    Codes should be stored. Take it to AutoZone and have them pull codes if you don't have a scan tool.
     
  5. Jan 10, 2020 at 8:17 AM
    #5
    negusm

    negusm New Member

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    only bucks during acceleration/deceleration?
     
  6. Jan 10, 2020 at 1:33 PM
    #6
    captsolo

    captsolo New Member

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    Start by changing the plugs

    Plug it into a good scan tool. That will find the codes and you will solve the problem without "throwing more parts" at it.
     
    Last edited: Feb 7, 2020
  7. Jan 10, 2020 at 10:48 PM
    #7
    SR5 Limited

    SR5 Limited New Member

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    Welcome and congrats on surpassing the 400k milestone. Hoping to do the same in the next couple years. I second plugs, but do the three coils and three plug wires if it hasn’t been done. OEM will run a few hundred but worth it. I also change two quarts of trans fluid when I do an oil change...
     
    Last edited: Jan 10, 2020
  8. Jan 13, 2020 at 8:26 AM
    #8
    negusm

    negusm New Member

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    I disagree on the coils. They run fine forever. You can also diagnose them fairly easily.

    Plugs and wires. And TOYOTA only plugs and wires.
     
  9. Feb 7, 2020 at 11:54 AM
    #9
    jross20

    jross20 New Member

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    Transmission flush with good oem style fluid
     
    Benny123 likes this.
  10. Feb 7, 2020 at 12:32 PM
    #10
    Benny123

    Benny123 Toyota enthusiast

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    Check the colors of rad and tranny fluids. Have you changed your radiator at any point? Pink milkshake is a known issue if the two mix.
     
  11. Mar 3, 2020 at 8:32 AM
    #11
    plcfcng

    plcfcng New Member

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    I had the same condition 6 months ago in my 2001 3.4 2wd. For me the problem was my Cat converter. If you want to check for this condition buy or rent a VAC gauge (they are pretty cheap or rent at Auto Zone or Orelleys) plug it into Manifold vac. Start the 4runner let come to a idle if it reads low VAC them most likely your CAT has gone bad. I chased this condition for about 2 months. To confirm the condtion you can remove the front 02 sensor and drive it a short distance and see if the condition goes away. This means exhaust is plugged some where most likely the CAT. A muffler shop can inspect for I think 25 dollars or so. If this is not it well you have eliminated one thing good luck.
     

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