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Possible EGR Valve, need advice...

Discussion in 'Technical Chat' started by mixx2001, Feb 2, 2010.

  1. Feb 2, 2010 at 2:57 PM

    mixx2001 [OP] New Member

    Feb 2, 2010
    Greensboro, NC
    Tacoma 4WD 3.4
    Hey guys! I've read the forums for a while, but this is my first post.

    My Tacoma's CEL came on a couple weeks ago. After a quick scan it returned a code for the EGR Valve, and a code for the EGR Circuit. After removing and cleaning the valve, and resetting the CEL, and driving a couple miles, the light came on again. This time for a Lean Mixture in Bank One. So I hooked up the vacuum leak smoke machine, and found a large leak at the Intake side flange of the EGR Valve. So I figured the thin metal gasket to the Intake Manifold (placed there by whoever replaced the Toyota EGR Valve with the aftermarket one there now), wasn't sealing after I removed the valve and cleaned it. So I ordered a new Gasket, and replaced it.

    After resetting the CEL again, and starting the truck, it idled normally until warm, and then idle surged, but ran fine otherwise. Sort of like it had an aftermarket cam. This time the code was a Random Misfire. I decided to reset the ECU by disconnecting the battery for 30mins, and then restarted again, this time with the hood up, and could hear air from the engine bay. It was coming from just under the EGR Valve's Actuator/Diaphragm on top of the Valve. If the Valve's Actuator/Diaphragm were a mushroom, the vacuum would be leaking just under the cap, but slightly above the EGR Intake Flange/Gasket. I also disconnected the EGR Vacuum Actuator/Modulator (mounted next to the EGR Valve via a "C Clamp" on the Intake Manifold), and the sound did not change. It was not delivering any vacuum to the EGR (which I understand the EGR is not supposed to get any vacuum at idle), so I assume the leak is from the Intake's vacuum.

    Here's what I'm thinking: The EGR's Actuator/Diaphragm was leaking a bit at first, and the better seal of the new Gasket has caused it to completely fail. Does this make sense? Do yo guys concur this truck news an new EGR Valve?
  2. Feb 2, 2010 at 6:15 PM

    Ridingontrd Well-Known Member

    May 7, 2008
    First Name:
    trd sport 4x4 w/towpkg
    aFe prodry,Dynomax ultra flo ss,Scangauge2,Demello front bumper,BudBuilt skids,sliders(local)AllPro rear bumper,Wet O's cobalt blu,w/halfpiping,TRD logo in gold,R/L hood struts,5150's@10"aal 3 pack,T/C uca,Light racing c/o,1"diff.drop,de-badged,
    bump for an answer.:)
  3. Feb 2, 2010 at 6:22 PM

    carmellocafe Begin With The End In Mind.

    May 15, 2009
    First Name:
    N. California
    2014 TRD OR Access cab longbed
    this truck news an new EGR Valve[/quote]

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