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Running lean?

Discussion in '1st Gen. Tacomas (1995-2004)' started by fouillard13, Dec 23, 2013.

  1. Dec 23, 2013 at 7:25 PM
    #1
    fouillard13

    fouillard13 [OP] Well-Known Member

    Joined:
    Jan 15, 2009
    Member:
    #12619
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    First Name:
    Riley
    Canadia
    Vehicle:
    1998 tacoma 4x4
    Truck
    1998 Toyota Tacoma 3.4 5 speed 4x4

    Issue
    Running lean & missfire

    I have been having problems with my truck lately with misfires. I finally decided to do a compression test.
    I took all the plugs out, pulled the EFI fuse and ran each cylinder with the throttle open. Each cylinder had 150 psi (truck has 230k miles) I then pored a little oil down each cylinder and they all shot up about 30 psi.

    When I pulled the plugs I noticed every plug was white and very lean. I have cleaned my MAF sensor before and did plugs,wires, coils. I am wondering why I am so lean. My air filter is cleaned an oiled (K&N) I am leaning towards a catalitc issue or O2 sensors. I have my own scanner and its showing multiple misfire and cylinder 1 miss fire. I bought a new plug today and also installed a new injector. I am going to trace cylinder 1's wiring. But this does not answer my lean plug issue.
    I have also done a fuel filter in the passed 10k


    Any thoughts?

    photo(12).jpg
     
  2. Dec 23, 2013 at 7:28 PM
    #2
    fouillard13

    fouillard13 [OP] Well-Known Member

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    Riley
    Canadia
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    Hmmmm.. After googling "Reading spark plugs" My plug seems to be fine?
     
  3. Dec 23, 2013 at 9:07 PM
    #3
    Alderleet

    Alderleet Ace of Spades

    Joined:
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    Salty Hell
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    '00 Acc Cab TRD 4x4
    pull and clean your injectors...

    you can go to a yard, pull a pig tail and use a 3v to kick open the injector on a momentary switch. Clean the absolute crap out of your injectors
     
  4. Dec 23, 2013 at 9:57 PM
    #4
    JLee50

    JLee50 Well-Known Member

    Joined:
    Nov 20, 2013
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    Phoenix
    Vehicle:
    Stockish 99 4x4 TRD
    ToyTec coilovers
    If you're going to clean injectors, your best bet is to have them professionally cleaned and flow tested. They're pretty precise devices.
     
  5. Dec 23, 2013 at 10:24 PM
    #5
    fouillard13

    fouillard13 [OP] Well-Known Member

    Joined:
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    Gender:
    Male
    First Name:
    Riley
    Canadia
    Vehicle:
    1998 tacoma 4x4
    I dunno if this help but I have ran alot of injector cleaner through my truck (Lucas)
     

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