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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

    #1
    Zich11 [OP] Member

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    Dunn, NC
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    98 reg cab 4x4
    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!
     
    Zich11, May 2, 2011
    #1
  2. May 2, 2011 at 4:21 PM
    #2
    98tacoma27

    #2
    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    Clean the MAF first. If it happens again, I would change the AFR (front O2 sensor).
     
    98tacoma27, May 2, 2011
    #2
  3. May 2, 2011 at 4:44 PM
    #3
    tacosuprem

    #3
    tacosuprem Well-Known Member

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    Seafoam through vacuum and like said above clean MAF
     
    tacosuprem, May 2, 2011
    #3
  4. May 2, 2011 at 6:29 PM
    #4
    MapleMoose

    #4
    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
     
    MapleMoose, May 2, 2011
    #4
  5. May 2, 2011 at 6:34 PM
    #5
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    Your code is for the rear O2 sensor. That should affect the engine sputtering. The rear O2 only monitors the CAT's performance.
     
    98tacoma27, May 2, 2011
    #5
  6. May 2, 2011 at 9:50 PM
    #6
    MapleMoose

    #6
    MapleMoose Drunk Canadian

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    Sorry i meant p0171
     
    MapleMoose, May 2, 2011
    #6
  7. May 3, 2011 at 4:41 AM
    #7
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    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.
     
    98tacoma27, May 3, 2011
    #7
  8. May 3, 2011 at 5:12 AM
    #8
    skytower

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    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.
     
    skytower, May 3, 2011
    #8
  9. May 3, 2011 at 5:17 AM
    #9
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    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

    Typically with this code, it's the MAF that is dirty (on these trucks)​
     
    98tacoma27, May 3, 2011
    #9
  10. May 3, 2011 at 5:19 AM
    #10
    skytower

    #10
    skytower Well-Known Member

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    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    ^Yep
     
    skytower, May 3, 2011
    #10
  11. May 3, 2011 at 9:14 AM
    #11
    MapleMoose

    #11
    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.
     
    MapleMoose, May 3, 2011
    #11
  12. May 3, 2011 at 9:15 AM
    #12
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    I know the Bosch O2's are hit or miss on taco's, mostly miss. Hopefully the NGK's will last.
     
    98tacoma27, May 3, 2011
    #12
  13. May 3, 2011 at 4:51 PM
    #13
    Zich11

    #13
    Zich11 [OP] Member

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    lots of WD 40 and paint 'touch up' pens
    thanks everyone
     
    Zich11, May 3, 2011
    #13
  14. May 3, 2011 at 4:53 PM
    #14
    98tacoma27

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    98tacoma27 is going full "SANDWICH" Moderator

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    Some stuff. Not a lot, just some.
    Keep us posted
     
    98tacoma27, May 3, 2011
    #14
  15. May 7, 2011 at 12:24 PM
    #15
    MapleMoose

    #15
    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!
     
    MapleMoose, May 7, 2011
    #15

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