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Misfire at low rpm

Discussion in '1st Gen. Tacomas (1995-2004)' started by reezen, May 29, 2010.

  1. May 29, 2010 at 11:11 PM
    #1
    reezen

    reezen [OP] New Member

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    99 PreRunner SR5 3.4 L
    I have a 1999 prerunner 3.4 L V-6 automatic. Its been giving me a P0303 trouble code #3 cylinder misfire. Changed spark plugs, leads and swap coil pack with #5 cylinder and the problem is still on the #3 cylinder P0303 . I also changed fuel filter cleaned Mas airflow sensor. It appears that the problem is more noticeable at low rpm (vibration) at higher rpm very little vibration.
     
  2. May 31, 2010 at 10:41 AM
    #2
    STravis

    STravis Well-Known Member

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    Travis
    Ruidoso, New Mexico
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    2012 TRD Offroad
    Same problem. bump.
     
  3. May 31, 2010 at 10:50 AM
    #3
    BeefTaco

    BeefTaco WESTern Alliance: NORCAL COAST

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    Santa Cruz County Ca.
    Sounds like you have covered almost everything you might have a bad injector or worst case a valve problem.
     
  4. Jun 7, 2010 at 12:13 AM
    #4
    reezen

    reezen [OP] New Member

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    Male
    Hawaii
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    99 PreRunner SR5 3.4 L
    Thanks for the reply. I went ahead and changed the injector on the #3 cylinder and problem resolved. One note to add is before I replaced it I checked the resistance on it and it was normal 15 ohms. Manual calls for 12 to 16 ohms.
    Not really sure if resistance changes when truck heats up or maybe a partially clogged injector.
     
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