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Truck is running really bad... Misfire...

Discussion in '1st Gen. Tacomas (1995-2004)' started by 99GreenYota, Dec 21, 2009.

  1. Dec 21, 2009 at 4:38 PM
    #1
    99GreenYota

    99GreenYota [OP] Well-Known Member

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    I would like to say that I am new here, and its nice to meet everyone! But I do have a question as well...

    I have a 99 toyota tacoma 4x4 V6 with about 170,000 miles on it. The other day I went on about a 200 mile drive and the truck ran fine for the drive. We then stopped to eat lunch, (turned truck off for about 30 mins) got back in, started it, and ran, but was shaking really badly. Engine light came on shortly after that so I took it to get checked... said it had a Cyl. 4 misfire. The guy said check the plugs, they may be bad. I had just changed my plugs probably 6 months ago, with the stock toyota plugs. but checked them and they were fine. Then we tried changing the plugs wires, and the Cyl. 4 Coil on plug thingy for Cyl. 1 and 4. Still nothing is better...

    Now here is the thing, when cold the truck starts fine, runs and will run normally till it gets warmed up, I have stopped and re-started it. Sometimes it gets over it, and runs normally. Thought it might be bad gas, but run sea foam through the tank and filled it up with different gas and ran that through. Still not better...

    Anyone have any better options?

    Thanks, Dan
     
  2. Dec 21, 2009 at 4:48 PM
    #2
    rab89

    rab89 Well-Known Member

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    have you done seafoam through the brake booster? worth a shot!
     
  3. Dec 21, 2009 at 4:51 PM
    #3
    johnw

    johnw Well-Known Member

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  4. Dec 21, 2009 at 5:03 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    could be a fuel injector....
     
  5. Dec 21, 2009 at 5:56 PM
    #5
    99GreenYota

    99GreenYota [OP] Well-Known Member

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    Brake booster? Unless i'm not sure what that is, its not really a problem happening with the brakes, but if it has another purpose, could be...? And with the injectors, thought about that as well, but the purpose of the sea foam was to clean the injectors...

    Dan
     
  6. Dec 21, 2009 at 9:19 PM
    #6
    MowTaco

    MowTaco Well-Known Member

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    He's talking about the vacuum line that feeds the brake booster. You feed the Sea Foam through it so it can clean stuff out.
     
  7. Dec 21, 2009 at 9:24 PM
    #7
    Justin723

    Justin723 Dont judge me

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    You pore the Seafoam in your PCV valve is what hes saying.
     
  8. Dec 23, 2009 at 9:10 AM
    #8
    99GreenYota

    99GreenYota [OP] Well-Known Member

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    So I tried the sea foam through the Vacuum tube on the brake booster, lots of smoke... drove well for a while. Then turned the truck off, and then back on again and it started to run rough again. It wasnt as bad as before, but still the engine bucked a little. Should I flush more of that stuff through there and just really clean it all out, or maybe go get BG run through it from a shop?

    Dan
     
  9. Dec 23, 2009 at 9:17 AM
    #9
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Did they code change when you swapped the coil and wires?
     
  10. Dec 23, 2009 at 10:44 AM
    #10
    99GreenYota

    99GreenYota [OP] Well-Known Member

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    no same code came up, cyl 4 misfire...
     
  11. Dec 23, 2009 at 10:52 AM
    #11
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    I would suggest getting the compression tested on that cylinder. If you have changed the plugs, wires, swapped coils, etc., then there isn't much left.
     
  12. Dec 23, 2009 at 12:08 PM
    #12
    Hambone155

    Hambone155 Well-Known Member

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    im saying ring! if you are hard on acceleration and non of that stuff worked. im saying rings or injector. even possibly messed up valve......................... use injector cleaner
     
  13. Dec 23, 2009 at 12:51 PM
    #13
    99GreenYota

    99GreenYota [OP] Well-Known Member

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    Well I dont have the tools for a compression test, so gotta take it to a shop for that. Would there be any benefit to run the sea foam through the vacuum hose again and really get it clean? And its had 2 injector cleaners run through it so far.
     
  14. Dec 23, 2009 at 12:58 PM
    #14
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Another dose of seafoam won't hurt anything. You can usually rent the tester from a parts store.
     
  15. Dec 24, 2009 at 9:55 AM
    #15
    99GreenYota

    99GreenYota [OP] Well-Known Member

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    So trucks doing something else now...

    when I start it to warm it up, it will idle around 2000 rpms, or higher. Then once it gets warmed up and i go drive it, the idle will go up and down repeatedly for a while. This just started happening after the sea foam treatment.

    Dan
     
  16. Dec 24, 2009 at 10:34 AM
    #16
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    That could be the IAC valve. It will do that if it gets stuck. It is located under the front of the throttle body. Use a toothbrush and carb cleaner to clean it. There are two or three bolts that hold it on.
     
  17. Dec 24, 2009 at 10:41 AM
    #17
    Justin723

    Justin723 Dont judge me

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    Dont forget to change your oil after you use seafoam as well.
     
  18. Dec 24, 2009 at 10:47 AM
    #18
    99GreenYota

    99GreenYota [OP] Well-Known Member

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    Should the computer be reset as well once all the cleaning is done. And is that just a simple battery disconnect or something more technical?
     
  19. Dec 24, 2009 at 10:53 AM
    #19
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    It won't hurt to do it. Yes, it's that simple.
     
  20. Dec 24, 2009 at 10:54 AM
    #20
    magnew

    magnew Well-Known Member

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    I had a 99 6 cylindar. I know there is a TSB for bad head gaskets. I had the same problem. it would run rough for bit then good. I took it to a local dealership and they replaced the head gasket and I also got a new engine out of the deal. It's worth checking out. Good luck
     
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