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  1. #1
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    300xs spark plug problems

    Got an 2014 300xs, at about 20 hours #4 plug came out and 3 other plugs were about to fall out, only held in with a few threads. Dealer checked the plug holes and put new plugs back in and torqued them like the service manual says to. Now at about 80 hours #4 plus came back out. Should I push for the dealer to replace the head? What would cause this? Thanks

  2. #2
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    Never had a plug back out of the head even with 150#'s compression.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
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  4. #3
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    I would have them look for the real problem. The only times I have ever seen spark plugs come loose was due to detonation.

  5. #4
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    How does detonation cause plugs to come out? Not doubting, just curious.....

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  6. #5
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    THats got to be the strangest thing ive ever heard of it almost ssounds impossible.

  7. #6
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    I don't know, maybe start here if you're really interested: http://www.dynotechresearch.com/blog...nYear=2008#212

  8. #7
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    Wow, that is a cool read. Thanks for the info. Who would have thought it could happen?
    Chad r, what do the plugs look like when they have come out? New heads at the very least would be my request from merc. I am going to see my bud who is a merc tech in the am, I will ask if he has seen or knows about this....

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  9. #8
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    Quote Originally Posted by XstreamVking View Post
    Wow, that is a cool read. Thanks for the info. Who would have thought it could happen?
    Chad r, what do the plugs look like when they have come out? New heads at the very least would be my request from merc. I am going to see my bud who is a merc tech in the am, I will ask if he has seen or knows about this....
    The plugs look normal. Thanks

  10. #9
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    Just talked with my tech bud. Never seen this happen with his 10+ yrs of merc repairs. Threads are stripped or plugs not installed properly was his only answer. A ddt should show a fault if the computer has detected detonation...

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  11. #10
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    But more likely, it's NOT detecting it or not at a low enough level; which would be why the plugs are backing out.

    The sensitivity of the knock sensor depends (partly) on how tightly it's screwed into the block... if it's not tight enough it won't be as sensitive (but the sensor could be bad, too).

    If it was knocking badly it probably would have come apart by now.

  12. #11
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    Sounds like it's time for some contact with the merc tech line for the OP. Or his dealer/tech.

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  13. #12
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    I don't think 300xs has knock sensor.

  14. #13
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    Quote Originally Posted by 2jz View Post
    I don't think 300xs has knock sensor.

    None on my 2007 300xs!
    Checkmate 2002 Convincor 270 496 MAG-HO

    2003 Cougar 22MTR w/300xs SOLD
    90 21Skater w/300xs - sold
    98 STV Euroski w/280 - sold


    2006 Trailblazer SS 6.0l 395hp

  15. #14
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    Quote Originally Posted by Euroski View Post
    None on my 2007 300xs!
    I'm curious, how do they manage to have independent knock control for each cylinder without a knock sensor?

    The new Propulsion Control Module (PCM) 07 microprocessor features a fuel calibration unique to the 300XS. The calibration, combined with the race-bred combustion chamber design, results in the engine producing peak power for a longer period of time at the upper rpm operating range. The PCM 07 optimizes fuel, spark timing and knock control for each cylinder independently, enhancing engine running quality and performance.
    http://www.screamandfly.com/showthre...300XS-Outboard

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  17. #15
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    no knock sensor or sensors on 300xs.

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