496 backfire
05-31-2009, 10:51 PM
#11
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Your problem could be anything. Someone that revs and holds their engine steady over 5K rpm's in neutral is just asking for problems! You can't even tell if a engine is missing on a cylinder at 5K rpm's in neutral. Your mechanic must love you.
06-01-2009, 06:27 AM
#12
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Thanks for all the suggestions.
It's difficult to imagine a spark plug at fault if indeed the backfire is through the exahust. The engine had no fault codes on the scan tool other than the usual ones. I'm guessing a lean condition would also cause a backfire from the intake and not the exahust.
So I think the most important thing he needs to do is get the boat back in the water and verify with certainity it's coming from the exahust and which side. I'll probably need to follow him to see if it's coming from one side or the other.
It's difficult to imagine a spark plug at fault if indeed the backfire is through the exahust. The engine had no fault codes on the scan tool other than the usual ones. I'm guessing a lean condition would also cause a backfire from the intake and not the exahust.
So I think the most important thing he needs to do is get the boat back in the water and verify with certainity it's coming from the exahust and which side. I'll probably need to follow him to see if it's coming from one side or the other.
06-01-2009, 07:15 AM
#13
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First of all NightHawk never said anything about it not doing it in neutral. He did clearly say it was backfiring through the exhaust,not the flame arrestor and only above 4K rpm's.
Your problem could be anything. Someone that revs and holds their engine steady over 5K rpm's in neutral is just asking for problems! You can't even tell if a engine is missing on a cylinder at 5K rpm's in neutral. Your mechanic must love you.
Your problem could be anything. Someone that revs and holds their engine steady over 5K rpm's in neutral is just asking for problems! You can't even tell if a engine is missing on a cylinder at 5K rpm's in neutral. Your mechanic must love you.
06-02-2009, 09:36 AM
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Thanks for all the suggestions.
It's difficult to imagine a spark plug at fault if indeed the backfire is through the exahust. The engine had no fault codes on the scan tool other than the usual ones. I'm guessing a lean condition would also cause a backfire from the intake and not the exahust.
So I think the most important thing he needs to do is get the boat back in the water and verify with certainity it's coming from the exahust and which side. I'll probably need to follow him to see if it's coming from one side or the other.
It's difficult to imagine a spark plug at fault if indeed the backfire is through the exahust. The engine had no fault codes on the scan tool other than the usual ones. I'm guessing a lean condition would also cause a backfire from the intake and not the exahust.
So I think the most important thing he needs to do is get the boat back in the water and verify with certainity it's coming from the exahust and which side. I'll probably need to follow him to see if it's coming from one side or the other.
06-02-2009, 10:24 AM
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06-02-2009, 05:52 PM
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I got mine out today with some new plugs and it ran perfect. Used the $4.00 Autolites. Old plugs really didn't look that bad and had 228 hours. Thanks for the input guys. Hopefully that's all it is for Nighthawk's buddy. Good luck.
Last edited by kcvega; 06-02-2009 at 06:08 PM. Reason: y
06-02-2009, 07:05 PM
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06-07-2009, 06:29 PM
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Good to here that it was not a big problem, what did the old plugs look like??? thank's
