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Taco has a hesitation!

Discussion in '1st Gen. Tacomas (1995-2004)' started by MotoXXX, Oct 9, 2009.

  1. Oct 9, 2009 at 10:08 PM
    #1
    MotoXXX

    MotoXXX [OP] Well-Known Member

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    My 02 Taco 3.4 kinda stumbles when the throttle is pressed, I can sometimes feel a slight hesitation. I have new plugs and air filter and have ran some injector cleaner thru a couple of times, it has 90k miles. Maybe the plug wires? Any help would be great!
     
  2. Oct 9, 2009 at 10:08 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    When was the fuel filter changed?
     
  3. Oct 9, 2009 at 10:14 PM
    #3
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    I would guess wires next...

    But the Fuel filter is a good choice too..:D
     
  4. Oct 9, 2009 at 10:25 PM
    #4
    BakoTruck

    BakoTruck Well-Known Member

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    I'll guess here and say the fuel filter is a good thing to replace just like posted above. But I will also suggest cleaning the MAS too, and maybe the throttle body?
     
  5. Oct 9, 2009 at 10:43 PM
    #5
    MotoXXX

    MotoXXX [OP] Well-Known Member

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    Good call! I will do the filter tomorow, where is it located? (02 tacoma prerunner quad cab) Whats the best way to clean the throttle body? Pull off the intake hose and spray it down with carb cleaner? When is a good time to change plug wires? Thanks!
     
  6. Oct 9, 2009 at 10:50 PM
    #6
    BakoTruck

    BakoTruck Well-Known Member

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    Mostly stock for now, I have added a cb radio, various cheap mods and I plan on adding aftermarket wheels and other items in the future.

    I would try the filter first and then clean the Mass Air Flow Sensor second which is easy, then the throttle body last because it will be harder to do.

    But if the filter change or the MAF cleaning does the trick, than you may not have to worry about cleaning the throttle body.

    The filter I'm not sure, you may want to get a Hanes manual and that will help you out a lot. The spark plug wires I'm not sure for your truck, but I'll guess and say every 100,000 or 150,000 miles, maybe someone can chime in on that.

    http://www.tacomaworld.com/forum/technical-chat/50153-how-cleaning-throttle-body.html

    http://4runners.org/writeups/throttle/index.html
     
  7. Oct 9, 2009 at 10:56 PM
    #7
    MotoXXX

    MotoXXX [OP] Well-Known Member

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    Will do, thanks for the help.
     
  8. Oct 10, 2009 at 6:12 AM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The Fuel Filter is located along the frame on the driver side. About where the driver seat is. Use an Electric contact cleaner to clean the MAF. Do it when the engine is cool/cold. I have very rarley found the plug wires to be an issue, but check them to make sure they are all plugged in propperly. The FSM for your truck.
     
  9. Oct 10, 2009 at 9:48 PM
    #9
    MotoXXX

    MotoXXX [OP] Well-Known Member

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    Thanks for the info on the filter location and the online manual.
     
  10. Oct 12, 2009 at 9:06 PM
    #10
    MotoXXX

    MotoXXX [OP] Well-Known Member

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    Update: cleaned maf and tb, they looked pretty clean, had some black on the TB. Put new fuel filter in. Same issue, slight hesitation when letting off the gas and then gasing it again, can feel it more on slight inclines/hills when gasing, leting off and then re-gasing it kinda stumbles, not real bad but bothersome. The truck seems to be a little hard starting since day one, seems to turn over quite a bit before firing, Think I mite do plug wires, thats all thats left. I put a flowmaster 50 series on it with stock filter air box, could this do anything? Weird!
     
  11. Oct 12, 2009 at 9:16 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The Flowmaster will sap a little power, but it shouldnt cause hesitation. How do the plugs look?
     
  12. Oct 12, 2009 at 9:20 PM
    #12
    MotoXXX

    MotoXXX [OP] Well-Known Member

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    I got some new plugs to put in and went to instal but they looked brand new so I left them alone, air filter is new too. I am stumped! What is the best muffler to run? I am not very happy with the flow 50, kinda noisy for me.
     
  13. Oct 13, 2009 at 6:01 AM
    #13
    stucksucksnayota

    stucksucksnayota Well-Known Member

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    Are you talking about stumble like when you are approaching a hill and you go to get on it and seems like it misses or something then after about a second or so it picks up and takes off?
    Mines does this every once in awhile and I never really thought about it being a problem and it never bothered me cause it only happened randomly, but I can see that being annoying if it happened all the time!

    Seems to me like it might just be a glitch in the computer software, but like I said mine only happens maybe twice a month.
     
  14. Oct 13, 2009 at 7:17 AM
    #14
    rb11701

    rb11701 Oh yeah!

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    Hmm, have you been getting worse gas mileage? I had a similar problem in my old 1997 Taco, turned out to be a o2 sensor. Also, a buddy just had the same kind of issue in his GT, same issue. o2 sensor. Replaced it and in both cases problem solved. I am not great with repairing autos, so take my advice with a grain of salt. But, it sure sounds like the same issue we both had. 90k is alot on the o2 sensor if I am not mistaken.
     
  15. Oct 13, 2009 at 7:22 AM
    #15
    bobwilson1977

    bobwilson1977 Well-Known Member

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    If it stumbles when you first press the accelerator, that could be the throttle position sensor. If it is either bad or even slightly mis-aligned the engine will stall a bit on initial acceleration.
     
  16. Oct 13, 2009 at 7:34 PM
    #16
    MotoXXX

    MotoXXX [OP] Well-Known Member

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    Played with it today driving, it seems to miss a beat when you let off an re exelerate, like it skips a beat trying to downshift. How do you ajust the throttle position sensor?
     
  17. Oct 14, 2009 at 10:28 AM
    #17
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    You should get CEL's if you have bad sensors or if they are not working right. Try pulling the negative off the battery for a few minutes. This will reset the driving charactersitics stored in the ECU. How many miles and was the timing belt ever changed?
     
  18. Oct 14, 2009 at 7:31 PM
    #18
    MotoXXX

    MotoXXX [OP] Well-Known Member

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    88k miles, just did the timing belt.
     
  19. Oct 14, 2009 at 7:41 PM
    #19
    XBrown

    XBrown Spartacus!

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    Sounds like fuel pressure could be low as well. Maybe a sticky fuel pressure regulator?

    Also, under what conditions does it stumble? When it's hot? When it's cold?
     
  20. Oct 14, 2009 at 7:52 PM
    #20
    MotoXXX

    MotoXXX [OP] Well-Known Member

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    I am stumped, running out of things to replace! Is there a way to check ajustment of the throttle position cable? I feels like the kickdown is slow to react when letting off the throttle and then pushing back down on it. Like it hesitats before kicking down. Fuuuuuudge!!!!!!
     
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