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code po301 and po300

Discussion in '1st Gen. Tacomas (1995-2004)' started by LHAHN07, Apr 4, 2008.

  1. Apr 4, 2008 at 5:35 PM
    #1
    LHAHN07

    LHAHN07 [OP] Active Member

    Joined:
    Dec 7, 2007
    Member:
    #3751
    Messages:
    40
    Pennsylvania
    Vehicle:
    02 Stepside TRD 4x4 SR5
    AEM intake, Magnaflow exhaust, Summit Racing leveling kit, Westin stanless steel Bull Bar, Line-X bedliner, B&M shifter, Performance Products stainless sidesteps, grey wire mod, more parts on the way!
    All right guys, I'm working on a 1999 Taco w/ a 2.7 engine... It came to my shop with a misfire and barely running. Scanned the computer and got codes PO301 and PO300. Replaced plugs and wires and reset memory, now I still have the codes and it doesn't run any better. And I do know it's not the coil packs. I don't know which way to go. This truck has 305,000 miles on it also. Any help would be greatly appreciated...:confused: :pray:
     
  2. Apr 4, 2008 at 5:41 PM
    #2
    humanoid

    humanoid bite me

    Joined:
    Jun 27, 2007
    Member:
    #1932
    Messages:
    2,744
    Gender:
    Male
    Sunny SoCal
    Vehicle:
    I had a '99 Xtra Cab PreRunner SR5 V6
    The codes are as follows:

    P0300 Random/Multiple Cylinder Misfire Detected
    P0301 Cylinder 1 Misfire Detected

    Not sure if that helps you any, hope you get it all sorted out though.
     
  3. Apr 4, 2008 at 5:55 PM
    #3
    LHAHN07

    LHAHN07 [OP] Active Member

    Joined:
    Dec 7, 2007
    Member:
    #3751
    Messages:
    40
    Pennsylvania
    Vehicle:
    02 Stepside TRD 4x4 SR5
    AEM intake, Magnaflow exhaust, Summit Racing leveling kit, Westin stanless steel Bull Bar, Line-X bedliner, B&M shifter, Performance Products stainless sidesteps, grey wire mod, more parts on the way!
    I know the code definitions... Thats why I started with plugs and wires, and checked the coil packs.
     
  4. Apr 4, 2008 at 10:53 PM
    #4
    RaiderSix

    RaiderSix Well-Known Member

    Joined:
    May 15, 2007
    Member:
    #1592
    Messages:
    54
    Got good compression?
     
  5. Apr 5, 2008 at 6:20 AM
    #5
    LHAHN07

    LHAHN07 [OP] Active Member

    Joined:
    Dec 7, 2007
    Member:
    #3751
    Messages:
    40
    Pennsylvania
    Vehicle:
    02 Stepside TRD 4x4 SR5
    AEM intake, Magnaflow exhaust, Summit Racing leveling kit, Westin stanless steel Bull Bar, Line-X bedliner, B&M shifter, Performance Products stainless sidesteps, grey wire mod, more parts on the way!
    I haven't checked that yet. I wonder if the valve adjustment could be causing this???
     
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