Clean your throttle body muffler 8.1 guys!

Discussion in 'General Discussion' started by mnm99, Jul 19, 2019.

  1. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    I never knew it existed. A friend of mine that is a marine mechanic mentioned it to me. I was getting 750rpm idle on my port motor longer that my star. It would take a long time for it to kick down after warm. He said to check my Muffler in my throttle body? Huh..Well I did and this is what it looks like. 420hrs, replace yours guys. Cost me $3 for both motors.
    https://www.wholesalemarine.com/muf...h4fcl8QHDzWsUmu5pWJ_872STTnAxVpQaAgC7EALw_wcB
    Gotta clean those blades too..


    muffler.jpg muffler1.jpg muffler2.jpg
     
  2. juggernaut1

    juggernaut1 Active Member

    870
    Apr 19, 2015
    Perth, Western Australia
    2006 38 Sundancer
    8.1S / ZF 63V Drives
    Yep I change them out each year as part of the annual maintenance. If they block, you'll need to replace your IAC. For this reason my merc tech suggests leaving them out.
     
    Last edited: Jul 20, 2019
  3. Leardriver

    Leardriver Member

    181
    May 24, 2016
    Denver, CO
    2004 270 Sundeck 8.1 Bravo III
    5.0, 5.7, 6.2 8.1 Bravo III over the years
    I block the valve open with a soft handle screw driver, hit the blades with a blast of carb cleaner, scrub the blades with a tooth brush, and rinse with another carb cleaner blast. Takes about 20 seconds.
     
  4. kysearay

    kysearay Active Member

    172
    Jun 15, 2017
    KY
    42 Sundancer

    65 Monticello
    8.1's gassers
    Thanks, just ordered mine just in case - i havnt even checked them
     
  5. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    They're on the small blocks too
     
  6. Motoguy2158

    Motoguy2158 Member

    33
    Oct 13, 2018
    Marysville, Mi
    340 Sundancer 2002
    6.2 Mercruiser with ZF V Drives, Garmin Nav, Radar and Autopilot
    It makesa terrible hiding sound when their out...not to mention all the crap ends up in the IAC valve.
     
  7. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Interesting note, that the previous design on the mefi ecm's have no muffler and the IAC rarely fails.
     
  8. Flytrade

    Flytrade Member

    107
    Feb 20, 2018
    Bradenton, FL
    2006 320 Sundancer
    Twin 6.2L Mercruiser
    How do I find the throttle body muffler on my 6.2L Mercruiser?
     
  9. Henry Boyd

    Henry Boyd Well-Known Member GOLD Sponsor

    Apr 24, 2007
    Newburyport, on the peaceful and serene Merrimack
    ‘09 Sabre 38 Express Hardtop “Serenity”
    Volvo D6 w/IPS450 Pods
    Don’t forget to clean spark arrestor screen while you’re at it.
     
  10. juggernaut1

    juggernaut1 Active Member

    870
    Apr 19, 2015
    Perth, Western Australia
    2006 38 Sundancer
    8.1S / ZF 63V Drives
    Agreed the muffler quietens things down. As for the 'crap' that ends up in the IAC valve is also ending up in your motor, so you'll have bigger things to worry about.

    I clean my bilge twice a year, clean my flame arrestor annually and change my mufflers annually and haven't had an IAC valve failure yet.

    My merc tech recommendation was merely aimed at prolonging the life of the IAC valve and pointing to the reason for their failures. Yes, I've left mine in because of the noise without.
     
  11. liv2ryde100

    liv2ryde100 Active Member

    486
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    Where is this located? I’ve never heard of this
     
  12. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's

    Pics in first post.
     
  13. liv2ryde100

    liv2ryde100 Active Member

    486
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    I saw but I’m still stumped
     
  14. juggernaut1

    juggernaut1 Active Member

    870
    Apr 19, 2015
    Perth, Western Australia
    2006 38 Sundancer
    8.1S / ZF 63V Drives
    Remove your flame arrestor and it's located at the 12 o clock position looking at your throttle body. Grab some long nose pliers to pull it out as its only an interference fit.
     
  15. liv2ryde100

    liv2ryde100 Active Member

    486
    May 17, 2012
    long island
    05' 340 dancer
    Twin 8.1's
    Ok thank you!
     
  16. copb8tx

    copb8tx Well-Known Member

    Jan 26, 2008
    Lake Texoma, TX
    2005 420 Sundancer
    T-8.1S Horizons
    Never knew these existed. Thanks for the heads up. Order placed.
     

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