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running lean

Discussion in '1st Gen. Tacomas (1995-2004)' started by Zich11, May 2, 2011.

  1. May 2, 2011 at 4:19 PM
    #1
    Zich11

    Zich11 [OP] Member

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    Dunn, NC
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    lots of WD 40 and paint 'touch up' pens
    98 4x4 manual 134,000 miles single cab....purchased couple weeks ago. Good condition. Intermitently get a bit of sputtering especially when shift into 2nd gear. Goes away after longer drives. Twice have gotten check engine light...scanner translates it to "engine running lean'...'cleared the code" and runs fine again....cause? Haven't had it long enough to know what has been replaced to date. No oil leaks, seems solid overall. Should I "shotgun it" and replace o2 sensor, plugs, wires and fuel filter. Seafoamed it last week, but just through gas tank. Was afraid vacuum method might fry the o2 sensor. Overall, love the truck!! Not much experience with auto mechanics, but quite a bit with Harley motors, so if replacing stuff doesn't involve tearing the engine down, can probably handle it.....thanks in advance for your time and expertise!
     
  2. May 2, 2011 at 4:21 PM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Clean the MAF first. If it happens again, I would change the AFR (front O2 sensor).
     
  3. May 2, 2011 at 4:44 PM
    #3
    tacosuprem

    tacosuprem Well-Known Member

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    Seafoam through vacuum and like said above clean MAF
     
  4. May 2, 2011 at 6:29 PM
    #4
    MapleMoose

    MapleMoose Drunk Canadian

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    3" Eibach Coils, 3" AP Springs, AP 6" Shackles Toytec Diff drop, BAMF Sliders, Deck plate mod,Volt meter, Highbeam mod, PIAA fogs, 18" Magnaflow, LED dash swap, Color matched Satoshi Grille, Custom Rear Plate Bumper
    I have the same code. p0141 i think? sub'd
     
  5. May 2, 2011 at 6:34 PM
    #5
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Your code is for the rear O2 sensor. That should affect the engine sputtering. The rear O2 only monitors the CAT's performance.
     
  6. May 2, 2011 at 9:50 PM
    #6
    MapleMoose

    MapleMoose Drunk Canadian

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    Sorry i meant p0171
     
  7. May 3, 2011 at 4:41 AM
    #7
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    That would be the front O2 or the MAF. I would suggest cleaning the MAF and if it doesn't work, then replace the AFR (front O2 sensor) with a Denso (OEM) direct replacement.
     
  8. May 3, 2011 at 5:12 AM
    #8
    skytower

    skytower Well-Known Member

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    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    Check the intake for vac leaks. Engine torque pulls on the intake and can open up small holes in vac lines and intake hoses. Spray throttle body cleaner on the outside and listen for rpm change.
    Codes do not always link directly to the part at fault. It just gives you a place to start looking for problems! It could be that your O2 sensor is bad, just don't think that's the only part that can cause that code.
    Does that engine have a distributor? If so, check the rotor and distributor for burn marks/wear. If present, replace. That will cause hesitation, among other problems.
     
  9. May 3, 2011 at 5:17 AM
    #9
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    This is true. The list of things to check (in order) from the FSM


    Air induction system
    Injector blockage
    Mass air flow meter
    Engine coolant temp. sensor
    Fuel pressure
    Gas leakage in exhaust system
    Open or short in A/F sensor (bank 1 sensor 1) circuit
    A/F sensor (bank 1 sensor 1)
    PCV valve and hose
    PCV hose connection
    EFI main relay
    A/F sensor heater and relay circuit

    http://www.ncttora.com/fsm/2003/Repair_Manual/03tacoma/di/eg5vzfe/cip01710.pdf

    Typically with this code, it's the MAF that is dirty (on these trucks)
     
  10. May 3, 2011 at 5:19 AM
    #10
    skytower

    skytower Well-Known Member

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    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
  11. May 3, 2011 at 9:14 AM
    #11
    MapleMoose

    MapleMoose Drunk Canadian

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    Well, replaced MAF sensor last night. Hopefully it doesnt come back on. I got the code for both o2 sensors in the fall and replaced them, code never came back on untill now. I used NGK sensors.
     
  12. May 3, 2011 at 9:15 AM
    #12
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    I know the Bosch O2's are hit or miss on taco's, mostly miss. Hopefully the NGK's will last.
     
  13. May 3, 2011 at 4:51 PM
    #13
    Zich11

    Zich11 [OP] Member

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    lots of WD 40 and paint 'touch up' pens
    thanks everyone
     
  14. May 3, 2011 at 4:53 PM
    #14
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    Keep us posted
     
  15. May 7, 2011 at 12:24 PM
    #15
    MapleMoose

    MapleMoose Drunk Canadian

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    The MAF seems to be the solution to my problem. Havent seen the CEl come back on yet. Keeping hopes high!
     
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