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3.4 V6 '02 PreRunner - Stumble during accel/hill

Discussion in '1st Gen. Tacomas (1995-2004)' started by floydski01, Sep 8, 2016.

  1. Sep 8, 2016 at 8:33 PM
    #1
    floydski01

    floydski01 [OP] Member

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    Bed cover, running boards.
    Can anyone lend some diagnostic help?
    I purchased an '02 DoubleCab with 3.4L 9 months ago, it how has ~172k miles. Recently, the engine misses/stumbles when accelerating, or on a hill (in other words; under load). It seems to be getting worse the last 2000 mi or so. Some time ago, I had one of the O2 sensors changed due to a chk eng light.
    Recently I ran a few tanks of Supreme fuel, have changed the air intake filter and the fuel filter. I am about to change the spark plugs (not sure of mileage on them); and if no help, my next step would be to change the spark plug wires?
    I checked codes via NAPA and AutoZone, neither showed any codes; but a check engine light that had appeared very recently, disappeared after checking the codes.
    Does anyone have any better ideas on where to go with this?
    Thanks!
     
  2. Sep 8, 2016 at 8:37 PM
    #2
    wilcam47

    wilcam47 Well-Known Member

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    Id try the spark plugs and wires. Also maybe try a fuel injector cleaner such as seafoam or something similar. and fuel filter if it has one.
     
    floydski01 [OP] likes this.
  3. Sep 9, 2016 at 8:38 AM
    #3
    floydski01

    floydski01 [OP] Member

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    Bed cover, running boards.
    Thanks Wilcam47! ... I will try all this, the injector cleaner is a good idea. ... I changed the fuel filter, no change in performance.
     
  4. Sep 9, 2016 at 10:28 AM
    #4
    GreekPEguy

    GreekPEguy Well-Known Member

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    I had something like this on my prerunner. Changed the spark plugs and the problem went away. Hopefully its just as simple for you.
     
    floydski01 [OP] likes this.
  5. Sep 9, 2016 at 3:11 PM
    #5
    markmb45

    markmb45 Well-Known Member

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    Sounds like a timing issue. When was the timing belt changed?
     
    floydski01 [OP] likes this.
  6. Sep 9, 2016 at 3:43 PM
    #6
    floydski01

    floydski01 [OP] Member

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    The thought crossed my mind ... I had it changed almost 3000 miles ago; so it's not due to wear, but could it have been installed a cog off? ... wouldn't the symptom be more severe though? It starts easy and idles smooth.
     
  7. Sep 9, 2016 at 3:45 PM
    #7
    TashcomerTexas

    TashcomerTexas Bwaaahh Stutututu vs Weeeeeeee

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    I had this issue a while back and changed the spark plug wires and good to go.
     
    floydski01 [OP] likes this.
  8. Sep 18, 2016 at 4:31 PM
    #8
    floydski01

    floydski01 [OP] Member

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    Bed cover, running boards.
    I installed new spark plugs today (Toyota PN: 90919-01192 - std Denso dual electrode).
    Problem solved!
    I will probably install a new spark plug harness fairly soon; I ended up breaking the retention tabs off the connectors that plug into the side of the 3 coils. ... not sure how prone these connections are to coming off without these tabs ... but it runs great for now.
    Thanks you all for your input; it was appreciated.
     
    wilcam47 and GreekPEguy like this.
  9. Sep 18, 2016 at 5:03 PM
    #9
    cruiserguy

    cruiserguy Well-Known Member

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    Appreciate you following up and posting the solution. This will be able to help others out in the future :thumbsup:
     
    lonzorizo likes this.
  10. Sep 18, 2016 at 7:37 PM
    #10
    lonzorizo

    lonzorizo Well-Known Member

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    Just posted about the same issue, lol. Getting new spark plugs Tuesday
     
  11. Sep 18, 2016 at 7:44 PM
    #11
    Beer:30

    Beer:30 I love lamp

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    Make sure you also get new plug wires, as they are often the cause, not so much the plugs, not that it wouldn't be a bad idea to change the plugs as well.
     
  12. Sep 18, 2016 at 7:49 PM
    #12
    lonzorizo

    lonzorizo Well-Known Member

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    Got NGK wires coming as well. Thanks
     
  13. Dec 12, 2016 at 11:45 PM
    #13
    floydski01

    floydski01 [OP] Member

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    OK, so more information on this one. ... Maybe unrelated to the original problem.
    After the problem was solved originally above, after about 700 miles; a very similar symptom re-appeared; a miss under load.
    The local AutoZone reader said the #5 cylinder was mis-firing. I changed the #5 spark plug only; but this made very little difference; although I detected what looks like a crack in the insulator.
    I installed a new Toyota spark plug harness next with no improvement. I checked with AutoZone again, it was still saying a #5 mis-fire; and their per the code, their diagnostics said to change the #5 coil. It made sense, so I purchased a new Denso coil from AZone. All is good
    now.
    Truck on. ;-)
    20161128_155430.jpg 20161211_111757.jpg 20161211_112932.jpg 20161211_113959.jpg
     
  14. Dec 12, 2016 at 11:50 PM
    #14
    TacomaJunkie8691

    TacomaJunkie8691 1999WineTacoma

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    Clean out your MAF and throttle body while you are trying to find the problem. This can only help.
    Good Luck,
    Paul
     

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