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Need help with diag. 92 T4R 3.0 boggs out when acccelerating

Discussion in '2nd Gen 4Runners (1990-1995)' started by mbracing9, Jul 20, 2015.

  1. Jul 20, 2015 at 10:20 AM
    #1
    mbracing9

    mbracing9 [OP] New Member

    Joined:
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    cody
    Vehicle:
    92 4 runner sr5 manual 3.0 V6 220k miles
    none yet
    Recently bought a 4 Runner in hopes of building an ultimate hunting rig. Want to get it running better before i spend time and money on the suspension.
    the problem:
    When i first bought it it had a bad miss and jerking under acceleration, slight miss during idle. when i bought it i got the service records on the vehicle for last 2 years. Vehicle has 220k miles on it now. timing belt done at 198k tune up at 203k and another at 213k.

    I have replaced 02 sensor and inspected Cat, looks fine. the distributor shaft had a lot of play and wore out cap. i replaced distributor, timing set at 10.
    helped a lot with the miss but still has a bog when accelerating quickly. under light acceleration it is fine, and will get up to 70mph and run fine.
    I pulled front cover thinking that the shop had done something wrong with timing belt. all marks line up correctly. plugs look fine. has anyone run into something like this? Any suggestions?
     
  2. Jul 20, 2015 at 10:22 AM
    #2
    mbracing9

    mbracing9 [OP] New Member

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    92 4 runner sr5 manual 3.0 V6 220k miles
    none yet
    It had a code 12 and 14. code 14 went away with changing distributor
     
  3. Jul 22, 2015 at 2:15 PM
    #3
    mbracing9

    mbracing9 [OP] New Member

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    92 4 runner sr5 manual 3.0 V6 220k miles
    none yet
    just did compression test. all cyl between 180 and 185psi.
     
  4. Jul 23, 2015 at 6:29 AM
    #4
    RonT4R

    RonT4R New Member

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    On one of my old Toyota trucks a 1994 the diaphragm inside the mass airflow meter went out and would bog down under acceleration but would run fine cruising, just a thought.:notsure: Worth a try.
     
    ThatFenwickGuyFromTW and Bob like this.
  5. Aug 21, 2015 at 6:20 PM
    #5
    C&Ayota

    C&Ayota New Member

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    I posted a few suggestions in another thread such as vaccum lines & the possibility ( slight possibility) of a fuel pump/ filter, but just changed out the water pump and timing belt in my 95 3.0. Under acceleration mine would hesitate and bog down. When I pulled the shroud of and the pump to change the belt, the timing was off 1 tick left. Once corrected, it runs smooth, idles great and increased the "power" under acceleration. It wouldn't be my FIRST diagnosis, but if you've exhausted all othe tune up items like plugs, wires, distributor etc... It might be worth looking into, Especially since it was done prior to you owning it.
     
  6. Aug 21, 2015 at 8:34 PM
    #6
    C&Ayota

    C&Ayota New Member

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    Ignore my timing theory... I just re read your post!
     
  7. Jan 7, 2016 at 4:13 PM
    #7
    Little Jim

    Little Jim New Member

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    Remove rear side bumpers, deck plate mod, relocate rear window switch to dash, removed rear wiper
    Did you clean the o2 sensor?
     
  8. Jan 11, 2016 at 10:55 AM
    #8
    ThatFenwickGuyFromTW

    ThatFenwickGuyFromTW Hillbilly

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    Fenwick
    Chesapeake, VA
    Vehicle:
    2 2nd Gen T4R's, 96 Tacoma 5 Lug
    Work in progress!
    Had this issue with my 96 Tacoma 2wd. Wasn't throwing any codes, but would bog down, stumble, hesitate, and backfire. Turns out that the MAF was just dirty enough to make the truck act up, but read just enough within range to not throw a code. Might give cleaning the MAF a shot. Any auto parts store should sell MAF cleaner spray.
     

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