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Why Don't 3.4's have EGR?

Discussion in '1st Gen. Tacomas (1995-2004)' started by shampoop, Jun 4, 2012.

  1. Jun 4, 2012 at 8:41 PM
    #1
    shampoop

    shampoop [OP] Well-Known Member

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    This is something that has been occasionally picking at my brain for a long time now. I'm hoping someone here knows why 3.4's don't need an EGR valve?

    Some thoughts:

    - Many newer vehicles do away with it because they have variable cam/valve timing that can produce a similar effect to an EGR valve however, 3.4's don't have this feature.

    - Maybe it's just because the engine naturally produces very low NOX levels due to a particular combination of compression ratio and valve/ignition timing?

    - Maybe the levels aren't actually that low but there are special exemptions on light trucks during those years? Similar to how diesel truck emissions laws lagged 20 years behind gasoline laws until recently?

    - No matter what I know it's going to boil down to the fact that the 3.4 just kicks ass, but we all knew that anyway :D

    - Do the 2nd gen v6's have EGR valves?
     
  2. Jun 4, 2012 at 9:10 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    I was told that the cam timing made an EGR un nessesary on it.
     
  3. May 13, 2013 at 5:29 PM
    #3
    00toytaco

    00toytaco Well-Known Member

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    I have a 2000 toyota tacoma 3.4 liter it does have an egr valve and an egr vacuum. There on the backside of the motor look at a haynes manual.
     
  4. May 13, 2013 at 5:43 PM
    #4
    maineah

    maineah Well-Known Member

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    Haven't seen any thing with out an egr valve since 1968.
     
  5. May 13, 2013 at 5:50 PM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    the 3.6 Pentastar engine doesnt have one. :eek:
     
  6. May 13, 2013 at 6:19 PM
    #6
    TacoDell

    TacoDell Truck ~n~ Tow

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    http://www.tacomaworld.com/forum/1st-gen-tacomas/134811-erg-valve.html

    there's no reference of a EGR valve in the '98-'00 FSM
    Haven't found mine in 13 years of servicing muh junk !? :confused::notsure:

    I did read something related to mini 2wd's, early 4R's, Tundra
    but I don't assume to trust everything I read.

    Let's see the picture of yers !?

    F that haynes crap
     
    Last edited: May 13, 2013
  7. May 13, 2013 at 7:52 PM
    #7
    thegame

    thegame WUT?

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    My California 2001 V6 must not have had an EGR from the showroom floor because I swapped a motor in from a 1997 4runner and I don't see an EGR valve. Passed CA smog this year too.
     
  8. May 13, 2013 at 8:37 PM
    #8
    Blackdawg

    Blackdawg Dr. Frankenstein

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    certain years came with it. Not sure which ones.

    Was popular to delete it on supras though. Not really needed. Just an emissions thing.
     
  9. Jan 14, 2017 at 7:38 PM
    #9
    1997tacomav6

    1997tacomav6 Well-Known Member

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    Interesting because my 1997 3.4 v6 has one
     
  10. Jan 14, 2017 at 8:48 PM
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    chaosrob

    chaosrob Well-Known Member

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    So does my 97 sx
    [​IMG]
     
  11. Jan 14, 2017 at 8:51 PM
    #11
    Bishop84

    Bishop84 Well-Known Member

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    Most EGR valves are gone now in Toyota world, the prius engine is one of the last stragglers to get rid of it, and they still have tons of issues with it. The 2nd gens never had it on the 4 liter. They just got air pumps that caused bigger headaches.

    I used to cut a coke can in the shape of the gasket with no port hole and block the EGR valves on the older cars I owned. Pre 1996 has no EGR monitoring!
     
  12. Jan 15, 2017 at 1:22 AM
    #12
    bry838

    bry838 Well-Known Member

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    Yeah i can also vouch some do and some don't, not sure when they were done away with on the 3.4 but they did certainly exist!
     
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