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P0402 excessive flow

Discussion in '4 Cylinder' started by duggravs, Jun 3, 2014.

  1. Jun 3, 2014 at 10:25 AM
    #1
    duggravs

    duggravs [OP] Active Member

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    ricky
    torrance, ca
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    stock 2004 prerunner
    airbox mod
    I have a 04 3rz the check engine light came on with code p0402 (excessive flow) I cleaned the iac and the egr (with carb cleaner). The egr seemed ok. It moved up n down when I added vacume to it. And after I installed it. I added vacume to it. And the motor stalled. (Isn't that what's suppose to happen?) all the vacume lines are good. for some reason the check engine light came on again. Should I look at something else? Or should I just replace the egr?
    I checked a couple forums. I can't seem to find a straight answer what it could be.
     
  2. Jun 5, 2014 at 6:17 PM
    #2
    duggravs

    duggravs [OP] Active Member

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    someone must of had this problem besides me.
     
  3. Jun 5, 2014 at 7:41 PM
    #3
    Ninj

    Ninj Well-Known Member

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  4. Jun 5, 2014 at 7:42 PM
    #4
    avw4x4

    avw4x4 Well-Known Member

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    I believe this is one of the more common codes. Could be as simple as an exhaust leak or bad o2 sensor.


    Scratch that, dyslexia got the better of me. I was thinking p0420
     
    Last edited: Jun 5, 2014
  5. Jun 5, 2014 at 7:51 PM
    #5
    duggravs

    duggravs [OP] Active Member

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    torrance, ca
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    stock 2004 prerunner
    airbox mod
    I just noticed that the r port on my throttle body was going to the vacuum switch valve. And not to the r port on the vacuum modulator. And the vacuum modulator hose was going to the R port on the throttlebody. Let see if that makes a diffrence.
    I'm going to be kicking my self in the ass if that was the problem.
     
  6. Jun 5, 2014 at 7:52 PM
    #6
    avw4x4

    avw4x4 Well-Known Member

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    OME 2.5" lift, cobra cb radio, smashed rocker panels
    Be sure to post up if it was the issue! :cheers:
     
  7. Jun 5, 2014 at 8:10 PM
    #7
    duggravs

    duggravs [OP] Active Member

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    I will.
     
  8. Jun 10, 2014 at 11:32 AM
    #8
    duggravs

    duggravs [OP] Active Member

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    ricky
    torrance, ca
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    airbox mod
    I can confidently say that I fixed the problem. It was two vacuum hoses that were switched around. I've been driving around for a couple days now with no check engine light.
    Thanks for all the hell everyone.
     
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