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What do I look for next ?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Poon, Sep 8, 2011.

  1. Sep 8, 2011 at 6:54 AM
    #1
    Poon

    Poon [OP] Member

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    As soon as I got my Taco about 6 months ago I replaced plugs, wires, filters, just to make sure everything was good on it. Well lately when I hit a hill and the truck down shifts I can feel it starting to skip and sets a CEL light. It idels and runs smoothe otherwise. The first time it set the light I had it scanned and it said cylinder 3 missfire , so I thought coil, and replaced it. Well.. it did it again, this time it said cylinder 6. I replaced that coil. Damn thing is still doing it. I haven't had it rescanned yet, but now it has new plugs, wires and 2 of the 3 coils replaced. What else could cause this skip when it down shifts and revs up ? Note it will also skip if I pull off with it on the floor, I just hardly ever do that so the only time I notice it is on down shifts.
    Thanks
     
  2. Sep 8, 2011 at 11:45 AM
    #2
    jbrandt

    jbrandt Well-Known Member

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    Are any of your plugs fouled? Best rescan it too. Brand new plugs can still get fouled. Just an easy thing to (re)check.

    You might want to do a compression test on all your cylinders.
     
  3. Sep 9, 2011 at 5:17 PM
    #3
    Poon

    Poon [OP] Member

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    I haven't pulled plugs yet because they only have a couple thousand miles on them, but I will do that soon to see if any of them look bad. I just rescanned it and it still says cylinder 6 misfire after I replaced the coil for what I think is #6. I replace the coil fartherest back from the front. That is # 6 isn't it ?

    Code it's throwing is P 0306
     
  4. Sep 15, 2011 at 11:37 AM
    #4
    Poon

    Poon [OP] Member

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    Pulled plugs and they looked like they were burning very clean. Ran a tank of fuel through it with seafoam and did the seafoam through the vac line. Started looking for any vac leaks and I haven't found any at this time. Anything else to look into ? There are 2 vac lines on the top of the intake that are just blocked off. Should they be ?
    [​IMG]
     
  5. Sep 15, 2011 at 11:49 AM
    #5
    bellassaiw10

    bellassaiw10 Formally afroman5015

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    I have the same 2 blocked off so im geussing yes, but good luck figuring out youre problem
     
  6. Sep 16, 2011 at 11:04 AM
    #6
    Poon

    Poon [OP] Member

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    Thank you.
     
  7. Sep 16, 2011 at 10:04 PM
    #7
    UndefinedTaco

    UndefinedTaco I'll eat all your food.

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    This ^


    or check to see if your MAF sensor checks out to FSM, within specs.
     
  8. Sep 17, 2011 at 8:11 AM
    #8
    scocar

    scocar Scouting the perimeter for weakness

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    Back to square one after the 2001. So...
    OP, are you using the stock Denso or NGK dual-electrode plugs?
     
  9. Sep 19, 2011 at 5:08 AM
    #9
    Poon

    Poon [OP] Member

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    Plugs are just single post plugs. I can't remember what brand. I would be happy to have the injectors rebuilt. What company will I contact to have that done ?
     
  10. Sep 19, 2011 at 9:59 AM
    #10
    scocar

    scocar Scouting the perimeter for weakness

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    Do the look like this (dual ground plugs):

    [​IMG]

    Using single-electrode or other non-spec plugs can cause problems. Just want to make sure this is not a contributing factor.
     
  11. Sep 19, 2011 at 11:16 AM
    #11
    Poon

    Poon [OP] Member

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    Not at all. Just regular old school style plugs. I am going to replace them this week I think. The guy at parts store told me it didn't really matter , so I took the cheap route, but I knew better.
     
  12. Sep 19, 2011 at 6:54 PM
    #12
    hayabusa3303

    hayabusa3303 Well-Known Member

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    Its for emissions but it was not used. Only place it would be used is in california thats is questionable( i havnt seen it so i cant say for sure).
     
  13. Sep 19, 2011 at 7:02 PM
    #13
    MTgirl

    MTgirl too many frogs, not enough princes... Moderator

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    Toy's run much better with the dual electrode plugs...try one of these and I bet your problem will be solved. :cool:
    Denso plugs - pk16tr11
    NGK plugs - bkr5ekb-11
     
  14. Sep 19, 2011 at 7:04 PM
    #14
    x2468

    x2468 Well-Known Member

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    I'm pretty sure you need the twin electrode plug with both gaped appropriately.
     
  15. Sep 20, 2011 at 5:55 AM
    #15
    Poon

    Poon [OP] Member

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    OK. Thanks. I'll be getting plugs this weekend and swap them out.
     
  16. Sep 20, 2011 at 6:06 AM
    #16
    magog45

    magog45 Well-Known Member

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    I swapped out single electrode for the proper dual electrode plugs last fall and truck seems to start much better with a bit better power but the one thing I have been doing and did it in my 289k Jimmy as well was fuel injector cleaner every second or third fillup. It does make a difference and its one of the first things mechanics around here do when someone complains about a loss of power.
     
  17. Sep 21, 2011 at 11:14 AM
    #17
    glamis3000

    glamis3000 Well-Known Member

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    i had the same thing it was my 3rd cylinder injector, i replaced all coils and wires and plugs, then did all injectors and that finally fixed my problem runs so much better and im getting better mpg too.. i am actually going to sell my old injectors for 75 dollars.. one of them is bad but for all 6 its not a bad price.. or ill sale you only the however many you want to buy.. they are off of a 96.
     
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