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Originally Posted by boat teck
(Post 2882745)
:drink: :coolcowboy: Good to here that it was not a big problem, what did the old plugs look like??? thank's
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Just curious did you shake it and here a rattle inside like one guy had said before?
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Mine also looked fine. Had a light gray color. Looking at them I'd of said they were fine and could not hear a rattle in them either.
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Sorry to kick up an old and dead thread, but this post helped me solve my problem. I'm a long-time lurker but figured I'd give back to the community since this saved me so much time and money.
My boat (2012 Bryant 267 w/Mercruiser 496 Mag) started backfiring through the arrestor on Sunday. After reading this thread (and a few others) I opted to swap the plugs and the fuel filter. Long story short, one of my plugs was cracked. I installed new Denso Iridium IT16 (which advance auto pricematched Summit Racing at $7.00/plug) and the backfiring has stopped and the boat runs better than ever. I do not understand why a backfire through the arrestor would be caused by a bad plug, so I was skeptical that this would work and was expecting that a valve job was in order. While swapping the plugs I did a compression test on every cylinder, all were good. If you are backfiring through the arrestor on a Merc 496, start with the spark plugs first! |
check the fuel supply module
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496 back fire
Originally Posted by Overtow
(Post 4843827)
Sorry to kick up an old and dead thread, but this post helped me solve my problem. I'm a long-time lurker but figured I'd give back to the community since this saved me so much time and money.
My boat (2012 Bryant 267 w/Mercruiser 496 Mag) started backfiring through the arrestor on Sunday. After reading this thread (and a few others) I opted to swap the plugs and the fuel filter. Long story short, one of my plugs was cracked. I installed new Denso Iridium IT16 (which advance auto pricematched Summit Racing at $7.00/plug) and the backfiring has stopped and the boat runs better than ever. I do not understand why a backfire through the arrestor would be caused by a bad plug, so I was skeptical that this would work and was expecting that a valve job was in order. While swapping the plugs I did a compression test on every cylinder, all were good. If you are backfiring through the arrestor on a Merc 496, start with the spark plugs first! Just wanted to add that I also had this issue this week . Thought it was a bad valve spring but ended up being a bad plug .. |
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