1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

3.4L misfiring on cylinder 3 and 4

Discussion in '1st Gen. Tacomas' started by fourthtaco, Jun 19, 2013.

  1. Jun 19, 2013 at 6:11 PM
    #1
    fourthtaco

    fourthtaco [OP] New Member

    Joined:
    Jun 19, 2013
    Member:
    #106617
    Messages:
    1
    Gender:
    Male
    Costa Mesa
    Vehicle:
    2003 TRD Tacoma 4x4
    During accelerating fairly hard to go around a stalled vehicle, my 2003 started missing/running rough. Scanner showed P300, P303 and P304. What would make 3 and 4 start misfiring all of a sudden like that? Thanks for your help.
     
  2. Jun 19, 2013 at 6:29 PM
    #2
    Alderleet

    Alderleet Ace of Spades

    Joined:
    Oct 16, 2011
    Member:
    #65324
    Messages:
    1,133
    Gender:
    Male
    First Name:
    Nick
    Salty Hell
    Vehicle:
    '00 Acc Cab TRD 4x4
    I had the same exact problem one day.

    Im not entirely sure what caused it either. Its like the 2 cylinders decided to cough and die.

    I seafoamed hte engine afterwards, and changed the EGR valve, and it hasnt happened again...
     
  3. Jun 19, 2013 at 6:45 PM
    #3
    Beee1985

    Beee1985 Active Member

    Joined:
    Jun 19, 2013
    Member:
    #106607
    Messages:
    33
    Gender:
    Male
    Check your spark plugs and spark plug wires, make sure they are not broken or nipped. I had this problem with my Camry.
     
  4. Jun 20, 2013 at 7:30 AM
    #4
    Inverno4

    Inverno4 Well-Known Member

    Joined:
    Mar 7, 2012
    Member:
    #74388
    Messages:
    248
    Gender:
    Male
    Baltimore, MD
    Vehicle:
    04 SR5 4x4 TRD Xtra Cab
    Check your ignition coil. Same issue I had and that fixed it
     
To Top