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    MapT Sensor Voltages?

    Hi guys, I have twin mercruiser 350 Mag horizon (ow360139) engines with 1 bad Map sensor. The mercruiser part (885165 or updated part 8M0087834) seems to go for about $350. A mechanic at my yard says they sell the automotive version for like $30. I found the auto version of the sensor which...
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    Cool Fuel Module Gen 3 failure symptoms

    Hey guys, I have 2006 twin 350 Mag Horizon closed cooled (OW360139). I recently had a no start issue that I believe I may have solved by replacement of the fuel water separator. The engine would not start 5 minutes after it was already running but has started both times since. My question is...
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    350 Mag - Cranks but no start - exhaust elbows recently changed

    Hi Guys, I have 2006 twin 350 Mag Horizon closed cooled (OW360139). Before dropping boat in water I changed the exhaust elbows. Boat ran fine on fresh water flush on land. I then dropped it in the water and ran fine again. The next day I start it up in my slip and ran fine for 2 minutes before...
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    Does this exhaust Elbow Screw require a washer- Have conflicting info

    Hi Guys, Should be a quick question. I have a 350 mag horizon closed cooled (0W360139) engine that I am replacing my exhaust elbows on. The Dry Joint Exhaust elbow manual from mercruiser says I need to make sure the screws to my Exhaust elbow (864591T02) requires specialized flat washers and to...
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    Any tips for dealing with problem caused by 100 gal of 2 yr old fuel?

    Without getting into the back story, my boat (twin 350 mags) has 100 gallons of 2 yr old fuel. It ran at a bit above idle speed fine yesterday for about 2 hrs. Today I go to start it up and both engines have a surging idle and sound like they are about to die at any moment. I checked the Gen 3...
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    Bravo 3 Oil Leak- Is this bad?

    I had my bravo 3 drive split and the top taken apart 2 weeks ago trying to find a shifting problem and to clean out the lower unit. The boat has yet to touch water yet 1 week after i had oil coming out from where the props meet the lower unit. I was told by the mechanic that this was probably...
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    Oil Leak from Props - Bravo 3 - after drive service

    Hi Guys, So one week ago; I had a mechanic service both of my Bravo 3 outdrives. He split the drives to clean everything out and even popped the top off to check on the gears and a shifting issue. I wasn't able to put the boat in the water because I discovered a torn shift cable boot after the...
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    Gimbal Ring- Pull the engine or drill the outdrive bell housing

    So I am faced with a tough decision. I have about 2-3 inches of play in my portside outdrive that I have narrowed down to wear in the pivot bolt going through the square gimbal ring opening. I have checked for excess play od the steering arm and tightened the 2 bolts on the outside of the...
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    350 Mag -Wont't start - No buzzer or guages working but has power to keyswitch

    Re: 350 Mag -Wont't start - No buzzer or guages working but has power to keyswitch The saga continues!!! Ok, So I got all excited hearing about that hidden fuse and looked for it but it doesn't look like I have it. I searched all over and pulled open every wire connection I could find on the...
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    350 Mag -Wont't start - No buzzer or guages working but has power to keyswitch

    Re: 350 Mag -Wont't start - No buzzer or guages working but has power to keyswitch Yes, I had the long lead hooked up to the positive terminal on the battery. Concernin the 1 1/2 v drop in the ground, what would allow the other engine to start? Also why does the voltage go up to 12.66v when I...
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    350 Mag -Wont't start - No buzzer or guages working but has power to keyswitch

    Hey guys, So I have a starting isue I can't figure out on 2001 formula. I have 6 yr old twin 350 Mag Horizons that have always started up fine, no issues. I winterized them in the fall with no issues. It is now spring and my starboard side engine starts up fine but the port engine doesn't even...
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    Saltwater waves swamped my engines; what action do i need to take?

    So a friend was helping me replace the water pump on one of the 350 mag engines on my boat this evening when the wind picked up dramatically and a few waves washed up and into the engine bay and on top of the engines. The engines were off and started up fine after everything was put back...
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    Sea pump Pressure / Block pressure Low

    Hey guys, Thanks for any help in advance. I have a new to me 2000 formula 280ss w/ fairly new (2006) 350mag horizons (OW359452) about 250 hrs. I just bought this boat and ran it fine for about 2 hrs and then got alarm horns. Was cruising around for about 45 min then idleing around for about 2...
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    Anyone make sense of these combination of codes?

    Hey guys, Thanks for any help in advance. I have a new to me 2000 formula 280ss w/ fairly new (2006) 350mag horizons (OW359452) about 250 hrs. I just bought this boat and ran it fine for about 2 hrs and then got alarm horns. Was cruising around for about 45 min then idleing around for about 2...
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    What to look for in a surveyor

    Hey guys am looking to buy a 2000 formula 280ss and have never hired a surveyor before. Anything I should be looking for in one guy over another (Recommendation?) I live in ny and the boat is in ft myers florida; so will need to transport as well. thx Brian
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    Do you need to paint a brand new prop?

    Hey guys, Simple question. Is the paint that comes on brand new props anti fouling paint or do I need to apply that myself. My boat sits at a mooring in salt water and sometimes doesn't get used for a few weeks so I definitely need it. Thx
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    Alpha 1 Gen 2 drive install question

    Hey guys; Have a quick question that I have searched but don't feel I have a definitive answer; also checked the manual in adult section. I am remounting my outdrive onto a 4.3L mercruiser but can't get the outdrive to sit flush against the bell housing. I have changed all the seals and have the...
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    Merc 4.3 6cyl RPM's jumping? not started 2 years

    Hello guys, Thx for your help so far. I am looking at buying a '93' boat from friends father that has not been started for 2 years. He's original owner and boat engine was running fine beforehand. Recently just changed oil in engine, alpha1 outdrive, and drained all the gas from the tank...
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    Alpha 1 outdrive won't lift, no motor sound; Help-PLease

    Started up the boat "93" after being dormant for two years, the fluid in the outdrive was not milky but was black. Unfortunately I could not even get the motor to make a noise when trying to lift the outdrive. Any suggestions on what to look for. Thx Sean
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    4.3L 6 cyl engine not started 2 years, what's wrong?

    Hey guys first time poster. I am buying my friends fathers boat that is a 93 dynasty with an original 4.3 6cyl mercruiser that has been sitting in the driveway for two years. I've done some research and heard I should be looking to see if the oil is milky. Should I just change it before it is...
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