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Burnt Exhaust Valves. Ideas?

Discussion in '1st Gen. Tacomas (1995-2004)' started by jjadkisson, Dec 6, 2010.

  1. Dec 6, 2010 at 4:33 AM
    #1
    jjadkisson

    jjadkisson [OP] Active Member

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    204,500 miles on my 2000, 3.4 V6. Still factory everything!

    Last month it started idiling really rough (only when it's in gear).

    Coded as "Misfire in Cyl 6". I changed the plugs, no dice. Plug wires, no dice. Checked the resistance on all the ignition components and coil packs, all good. Changed the Cyl. 6 fuel injector, no dice. Electrical check to the injector is excellent. I took it to a mechanic and he says I more than likely have a burnt exhaust valve and he wants $1200 to do all the valves and timing.

    I can't afford to have this done and get my family Christmas too.

    I've never been that deep into an engine before, but I am an aircraft mechanic in the military, so I'm not totally scared to get in there either.

    ANY ideas or experience with valves, timing or what to do is greatly appreciated.
     
  2. Dec 6, 2010 at 4:37 AM
    #2
    SOSHeloPilot

    SOSHeloPilot Well-Known Member

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    Perhaps someone can post one of the technical sites to help you ?? .... With your mechanical skills, you can probably do it ... good luck man.

    .
     
  3. Dec 6, 2010 at 4:43 AM
    #3
    jjadkisson

    jjadkisson [OP] Active Member

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    Thanks for the motivation. This whole mess has me completely stressed, expecially this close to the holiday.
     
  4. Dec 6, 2010 at 4:48 AM
    #4
    river rat

    river rat Tool Geek

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    When it rains, it pours.
    I would pull the heads and price out a machine shop to rebuild them.
    Never heard much of burnt exhaust valves on a 200K mile engine though unless it was air-cooled.

    Could they just be carboned up and not sealing properly? Does it make a chuh-chuh-chuh.... sound idling?
    Compression?
     
  5. Dec 6, 2010 at 5:26 AM
    #5
    jjadkisson

    jjadkisson [OP] Active Member

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    When it's in park and idling, it does sound like it's missing. I have a cold air intake on it and if you listen to the sound of the intake "hiss" it's missing as well. Once you put it in gear, the idle becomes so rough that it feels like it's going to stall out at any minute. :(
     
  6. Dec 6, 2010 at 5:32 AM
    #6
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    You've never had the timing belt changed before?
     
  7. Dec 6, 2010 at 5:40 AM
    #7
    Mod

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    Did this mechanic do a leakdown test and/or a borescope inspection??. or did he just guess??.

    How did the plug look on #6?
     
  8. Dec 6, 2010 at 5:43 AM
    #8
    jjadkisson

    jjadkisson [OP] Active Member

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    I think he is "educated guessing".
     
  9. Dec 6, 2010 at 5:44 AM
    #9
    jjadkisson

    jjadkisson [OP] Active Member

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    No sir. It's all original.

    Is it a chain or belt?
     
  10. Dec 6, 2010 at 5:51 AM
    #10
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    It's a belt that needs changed every 90k miles.

    I highly doubt you have a burned valve. Other tests need performed before you blindly shell out that kind of dough.
     
  11. Dec 6, 2010 at 5:57 AM
    #11
    Mod

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    Did he at least do a warm engine compression check?, or put a timing light/monitor on it to see if it jumped time?
     
  12. Dec 6, 2010 at 6:00 AM
    #12
    jjadkisson

    jjadkisson [OP] Active Member

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    Is it common for the heads on 3.4 V6 to last over 200,000 miles?

    Everything I hear and read says if you are getting into the heads and valves, you need to go ahead and do the timing and water pump we well. Is there any truth to that?
     
  13. Dec 6, 2010 at 6:00 AM
    #13
    jjadkisson

    jjadkisson [OP] Active Member

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    I'm going to call and ask him now.
     
  14. Dec 6, 2010 at 6:02 AM
    #14
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Yes its. And the timing should have been done a long time ago. I don't think you have a valve/head issue at this point. What plugs and wires did you use?
     
  15. Dec 6, 2010 at 6:23 AM
    #15
    jjadkisson

    jjadkisson [OP] Active Member

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    NGK plugs. Nothing special, no splitfire or irridium. Just what Advance Auto said it called for in their computer.

    NAPA Belden Premium 5mm plug wires.
     
  16. Dec 6, 2010 at 6:25 AM
    #16
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    They are the dual ground plugs, correct?
     
  17. Dec 6, 2010 at 6:40 AM
    #17
    jjadkisson

    jjadkisson [OP] Active Member

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    He did neither.

    He just said that since it's only one cylinder (Cyl. 6) that is getting the misfire, it can't be timing. He said there would be problems with more than one cylinder if it were a timing issue.
     
  18. Dec 6, 2010 at 6:42 AM
    #18
    BrokenTusk

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    All serious though, Good luck man besides replacing plugs that the depth I've gone into my engine
     
  19. Dec 6, 2010 at 6:45 AM
    #19
    jjadkisson

    jjadkisson [OP] Active Member

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    I'm not sure what that means.

    However, the problem existed prior to the plug change and developed over the life of the previous set of plugs.

    For what it's worth, I do remember the guy at the counter being suprised at the fact that the truck only calls for a "cheap" plug.....

    The old and new ones are BKR5EKB-11
     
  20. Dec 6, 2010 at 6:49 AM
    #20
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Dual ground = Two prongs...........which the correct plug for this motor.

    [​IMG]
     
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