502 Mag Mpi Running Bad
08-12-2009, 01:02 PM
#11
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Location: HollyWood,FL..And Alicetown,Bimini
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08-12-2009, 08:04 PM
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So changed the fuel/water filter and check the plug and plug wires. Ran good and then out of no where smooth water started doing it again, this time it is doing it at lower RPM'S as well as higher RPM's. I know I need to hook it up to a computer but what stuff can I check til then. I'm thinking about replacing the plug wires in the morning, one of the wires has a tear in it at the plug and has been tapped together by electrical tape. ANY HELP!!!!
08-12-2009, 08:53 PM
#14
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So changed the fuel/water filter and check the plug and plug wires. Ran good and then out of no where smooth water started doing it again, this time it is doing it at lower RPM'S as well as higher RPM's. I know I need to hook it up to a computer but what stuff can I check til then. I'm thinking about replacing the plug wires in the morning, one of the wires has a tear in it at the plug and has been tapped together by electrical tape. ANY HELP!!!!
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08-13-2009, 08:21 AM
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You panicing settle down take a deep breath....... replace all the wires. then when its dark I mean really dark out start the motor and look at the coils see if there arching over . My SeaRay had acouble coils arching over once that caused havoc but spotted the bad one in the total dark that was on a 8.1LS horizon motor
08-17-2009, 09:26 PM
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So after going crazy...My Uncle got into town (has a 46 searay after several upgrades and does all his own MNT, had 454's in his old boat) and we started with the replacing all the spark plug's and wires. Found a dirty contection on the distributor. Still did not fix it. While we were out trying after all that, Trying to pay attention to everything, I noticed that the engine temp would bounce up for about 30 secs to 60 secs and then drop down. That is when I said give me a soco and diet, It was the freakin fresh water intake impeller, engine was protecting itself. Spent 3 hrs pulling the pump out and taking the impeller out and sure enough 1 blade gone and several others going. Replaced it and runs like a dream. Ran for three days and got a "pin" hole leak in my power steering fluid hose... Said enough is enough and took it out of the water and trailered it home to Dothan AL. Took the hoses off tonight and getting two made tom. Be running in Destin or the Chattahoccee River this weekend. Thanks for all the tips
