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MerCruiser 7.4L 310HP Running Rough and throwing code 43 Continuous knock

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MerCruiser 7.4L 310HP Running Rough and throwing code 43 Continuous knock

Old 03-07-2017, 09:03 PM
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Swapped the plugs and wires tonight. The plug wires didnt look terrible, they just looked old. two of the spark plugs that came out were a little wet. nothing crazy, all the rest seems pretty fine. I am going to purchase a timing gun tomorrow and hopefully back the boat in the water and time it Thursday or Sunday.
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Old 03-10-2017, 12:45 PM
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Originally Posted by F-2 Speedy
Why in the world would you move to that God forsaken place, I use to live in the Colony when it had 5k people, now it has 55k
All 55k of then are often sitting in the main st construction disaster at the same time now too..
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Old 03-10-2017, 12:49 PM
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And my folks are from Kansas, my money says he is going to enjoy Lewisville big time . At least Little Elm park is a good draw now
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Old 03-10-2017, 02:38 PM
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If need to be, I am in Arlington TX and have a lake very close by for testing boats. I mostly likely could fix this or least look into the problem(s) for a proper pinpoint of the cause. I have been known to fix a boat or 2. But I wont say how many. I do this for living, have all the tools and all the scan tools ever needed and of course have to charge you for the services. Just so we are on the same page.

Last edited by BUP; 03-10-2017 at 02:41 PM.
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Old 03-11-2017, 11:47 AM
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One of these days ill get John to come out to lewy and play .
Maybe if i promise him some free wakesurf lessons . Behind a twin engine formula . With a blonde girl driving , while i drink beer .
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Old 03-11-2017, 03:03 PM
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James your funny. the only thing I could do for and on a wakeboard boat is make a good ballast system, 6: 3" 245 lbs. worth
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Old 03-12-2017, 09:50 PM
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Well guys/girls I got out on the lake today. Checked the timing it was set to 10° BTDC. But I think it was a mixture of the cap and rotor needing replaced that fouled 2 of my plugs and old gas. It seemed to run fantastic. Seemed really responsive even though I don't have a scan tool to tell if it's knocking, it was a night and day difference. I'll know more once I get out there for a longer day, but for the time being I am happy with how it ran. Thanks all for the input! If any of you get out to lewisville let me know!
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Old 03-13-2017, 12:27 PM
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Ill be out there next weekend. Wont be in the 272 , its down having rear engine cover redone. But ill be out there in something between a 36'silverton and a 22'wakesetter.
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Old 03-15-2017, 06:17 PM
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Originally Posted by airjunky
Ill be out there next weekend. Wont be in the 272 , its down having rear engine cover redone. But ill be out there in something between a 36'silverton and a 22'wakesetter.
We have some friends coming to town this weekend so probably wont make it out to the lake.. We do need to get some people together in the OSO community to one of the local lakes for a meet up. Maybe a small poker run!
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