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00' 3.4 Valve Cover Gasket Just Replaced, Chk eng light returned.

Discussion in '1st Gen. Tacomas (1995-2004)' started by ForumContributorsAreLife, May 19, 2017.

  1. May 19, 2017 at 2:06 PM
    #1
    ForumContributorsAreLife

    ForumContributorsAreLife [OP] Active Member

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    Title says it all. I have an 00' taco with the 3.4l. I just replaced the valve cover gasket, along with some grommet/washers, spark plug wires, spark plugs, pvc valve, all that good stuff. I ordered the kit off of eBay from a Toyota dealer. Paid $200 all in all. I also replaced the injectors branded Denso. Everything was genuine parts. My question is..... The darned check engine light came back telling me I have a bad valve cover gasket....... what gives?
     
  2. May 19, 2017 at 2:07 PM
    #2
    ramonortiz55

    ramonortiz55 Not A Well-Known Member

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    welcome to tw



    ...elaborate on your screen name..
     
  3. May 19, 2017 at 2:13 PM
    #3
    cruiserguy

    cruiserguy Well-Known Member

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    Not sure if there is a DTC for valve cover gasket. Do you know the actual code number by chance?
     
  4. May 19, 2017 at 2:14 PM
    #4
    ForumContributorsAreLife

    ForumContributorsAreLife [OP] Active Member

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    ForumContributorsAreLife

    Users who contribute their advice, opinions, or expertise to another fellow user in need of it are life. Life as in they make things easier and save headaches. :) thanks for the welcoming.
     
    SwampYota, otis24 and ramonortiz55 like this.
  5. May 19, 2017 at 2:16 PM
    #5
    ForumContributorsAreLife

    ForumContributorsAreLife [OP] Active Member

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    Lost the paper that I wrote the code down onto, was an AutoZone scanner. :/
     
  6. May 19, 2017 at 2:30 PM
    #6
    cruiserguy

    cruiserguy Well-Known Member

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    Mmmm, we're really gonna need that code. Also, the info on the taco. Which engine, tranny, mileage, the maintenance that's been done, etc. The more the specific the info, obviously as possible, the more specific of answer or help you'll likely get. Yeah welcome to the most helpful Tacoma forum online. :thumbsup:

    Edit: oops just noticed you had the engine and year in title of thread.
     
    Last edited: May 19, 2017
  7. May 19, 2017 at 2:49 PM
    #7
    otis24

    otis24 Hard Shell Taco

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  8. May 19, 2017 at 2:54 PM
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    BAMFTACO

    BAMFTACO Another day another beer

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    Probably something not hook up or partially connected look over everything double check the work
     
    FirstTimeFirstGen likes this.
  9. May 19, 2017 at 3:19 PM
    #9
    1988Mercedes

    1988Mercedes Well-Known Member

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    I think Autozone gave you incorrect info. I don't think your going to find a code for such. How is the computer going to know that? It might see low vac. pressure but no way to make that a valve cover gasket. Get the code.
     
  10. May 19, 2017 at 6:39 PM
    #10
    devinzz1

    devinzz1 Well-Known Member

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    code for a valve cover gasket? thats not even possible to detect...
     
  11. May 19, 2017 at 7:27 PM
    #11
    wht95scort

    wht95scort Well-Known Member

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    The real question here is why did you change your injectors?
     
  12. May 19, 2017 at 7:52 PM
    #12
    ForumContributorsAreLife

    ForumContributorsAreLife [OP] Active Member

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  13. May 20, 2017 at 7:27 AM
    #13
    ForumContributorsAreLife

    ForumContributorsAreLife [OP] Active Member

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    Codes were P0301 and P0440. And their computer suggested the part, I was already gonna replace it anyways because it would drip oil every now and then.
     
  14. May 20, 2017 at 7:29 AM
    #14
    ForumContributorsAreLife

    ForumContributorsAreLife [OP] Active Member

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    Only reads codes or live data as well?
     
  15. May 20, 2017 at 7:34 AM
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    1988Mercedes

    1988Mercedes Well-Known Member

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    Google is your friend here. Nothing to do with valve covers. 301 is misfire on cyl 1 and 440 is the evap system.
     
  16. May 20, 2017 at 7:46 AM
    #16
    cruiserguy

    cruiserguy Well-Known Member

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    Try swapping first coil pack with another and see if the MIL follows the coil pack or stays with that first cylinder.
    Can't remember if on the P0440 a new gas cap was a common fix or not.
     
  17. May 20, 2017 at 7:51 AM
    #17
    ForumContributorsAreLife

    ForumContributorsAreLife [OP] Active Member

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    I ound the print out, and it says the most common fix seen by ASE certified technicians is to have the valves adjusted to OEM settings. I literally just saw that right now.
     
  18. May 20, 2017 at 7:53 AM
    #18
    ForumContributorsAreLife

    ForumContributorsAreLife [OP] Active Member

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    I forgot to note, the misfires have been dealt with. I included it just incase theres a pattern with these two specific codes.
     
  19. May 20, 2017 at 11:10 PM
    #19
    otis24

    otis24 Hard Shell Taco

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    Reads codes as well as live data. I use the free version of OBDCarDoctor app. The pro version allows you to actually record the data as well.
     

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