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And then she went bang

Discussion in '4 Cylinder' started by Kredence, Dec 3, 2010.

  1. Dec 3, 2010 at 7:40 AM
    #1
    Kredence

    Kredence [OP] Well-Known Member

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    Justin
    Arizona
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    '00 Runner
    I'm still trying to determine an issue on my 2RZ. Now that it is colder out, a problem with hesitation has become more predominant. When the engine is cold, it starts just fine but as soon as I pull on the road, it has very little throttle response. I can push the pedal down 50% and she will move slightly faster than an idle speed. Other mornings, it drives without a single problem. The issue always goes away once the engine starts to warm up (actually, within 15-20 seconds the problem is gone). I figured the TPS might be at fault even though it's passed each time I've tested it when it's cold. I had planned to buy a new one anyways, until yesterday.

    I pull out onto a main road and had forgotten about the possible hesitation. Of course, at the time the truck went no where. I pushed the pedal down to the floor and that is when I got two, loud, distinctive back fires up threw the intake manifold.

    So this is my conclusion so far;
    TPS shouldn't cause a backfire like that
    A stretched Timing chain should cause the problem on every cold start.

    Possible faulty crank sensor? Possible plugged cat? (although no problems persist shortly after start up) I'm at a loss.

    '98 Taco, 195k, 2RZ
     
  2. Dec 3, 2010 at 8:01 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Ben
    Beech Creek
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    05 Tundra SR5 (+250k AND COUNTING), 88 SR5 PU (SOLD), 98 TRD OR (CRUSHED)
    5100's all on fours
    How old are the ignition components? Plugs? Wires? Etc? You could just need a good tune up.
     
  3. Dec 3, 2010 at 10:02 AM
    #3
    Kredence

    Kredence [OP] Well-Known Member

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    Justin
    Arizona
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    Plugs are brand new and I just installed a set of Dealer wires last week.
     
  4. Dec 3, 2010 at 11:39 AM
    #4
    skytower

    skytower Well-Known Member

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    Dave
    virginia
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    08 Tacoma 4x4
    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    Cap and rotor on that one? If so, replace it.
     
  5. Dec 3, 2010 at 11:47 AM
    #5
    BeerHat

    BeerHat Got Beer?

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    PreRunner 4x4, Homebrew Front Bumper, Homebrew Sliders, Homebrew Skids, Homebrew Bedbar, Homebrew Beer
    Check for vacuum leaks; pcv hoses, EGR, intake manifold, air intake chamber, throttle body, brake booster
     
  6. Dec 3, 2010 at 12:29 PM
    #6
    Kredence

    Kredence [OP] Well-Known Member

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    Male
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    Justin
    Arizona
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    '00 Runner
    Two Coils, No cap and Rotor. Both coils Ohm out correctly.

    The PCV hasn't been replaced. I'll do that today. Intake/Throttle body just got resealed during my hunt for this problem. I seafoamed the intake and engine and it's much cleaner but didn't change anything.
    I also cleaned the Idle speed controller (highly recommended).

    I'm going to try and hunt for a possible vacuum leak.
     
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