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    Merc 5.0 no oil pressure

    Gentlemen, engine 2005 merc 5.0 mpi # 0W040809. Port engine reads no oil pressure. Swapped gauges with stbd engine and same thing, I guess gauge is not the issue. Replaced oil pressure sending unit and same thing, no oil pressure. What else is between gauge and sending unit that could be...
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    2005 Mercs Twin Smartcraft rigging

    So, after messing around digging in the engine compartment and searching the net I believe that for my boat to have Smartcraft digital display on my iPad I will need the following: 2 Data Cables 879981 (one for each engine) connected to the engine side (photo: can line) Other end of data cable...
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    RPM gauges wrong readings

    Here I go again... RPM gauges don't read 0 rpm when engines off, any ideas what could cause this? With engines running they work fine.
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    2005 Mercruiser 5.0 MPI rough idle booking underload

    Hello, My new to me 2005 Formula 280 ss has twin Mercruiser 5.0 MPI with Bravo III serial #0W04809 and # 0W04793. While bringing boat home to Miami from Deerfield Beach I noticed idle was rough and engines would stall sometimes. Also under load had difficulty getting boat to plane. At around...
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    Mercruiser Bravo iii trim speed

    Hello, my starboard bravo iii outdrive moves much slower (up and down) than port outdrive. It has been like this for years. What could be at fault? What controls the trim speed ?
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    Mercruiser Tachometer not working

    My 1998 Mercruiser 5.7 tbi refi boat has a strange issue. The tach (vdo) shows rpm's but the hour meter is not working/advancing. Any ideas?
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    Mercruiser 5.7 EFI no start

    Hello, yesterday tinkering with engine because of running rough. Now when turn on i hear fuel pump energized but when hit start button no cranking. All i hear is a click noise coming from relay. Did i disconnect a sensor by mistake? what will cause engine to not crank? Please help! 1998...
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    Mercruiser 5.7 spark plug cylinder 5 looks bad

    Spark plug cylinder 5 looks bad, compression is 109, all others between 138-140.What causes a spark plug to have build up like this. Water intrusion from manifold? valves out of whack? cylinder head gasket?
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    Ignition Control Module in 1998 Mercruiser 5.7 tbi/efi

    Hello, I have twin 1998 mercs 5.7 tbi efi engines, starboard runs perfect but port engine took a dump on me and doesn't want to start. Initial diagnostic said bad starter, not enough cranking power. Replaced and now don't have fuel pulse at injectors, disconnected fuel rail at carb and shoots...
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    What is elbow plug for?

    My 1998 Mercs 5.7 efi dont have risers only elbows and there is a plug in front of them. What is it for? Im wondering if i can attach somehow a water hose i could flush elbows( the weakest link) while having boat in the water thus slowing down corrosion. Has anybody done this? is it possible?
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    Jabsco, vacuflush or other

    Hello, can someone tell me by looking at the photo if what i have is a jabsco,vacuflush or other brand head? Thanks
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    Merc -5-7-efi-please-help-fuel-system-issue

    Can i test fuel system out of the engine? I took everything out, following service manual info, fuel cooler,pump,regulator,hoses from filter and hose going to carb. Its a 1998 5.7 efi, tbi. Changed a few damaged o-rings, pump energizes, regulator is dry, When i had system in the boat i...
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    Merc 5.7 efi fuel test

    Can i test fuel system out of the engine? I took everything out, following service manual info, fuel cooler,pump,regulator,hoses from filter and hose going to carb. Its a 1998 5.7 efi.Changed a few damaged o-rings, pump energizes, regulator is dry, When i had system in the boat i disconnected...
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    Where to connect hoses for fuel leak test 1998 Merc 5.7 efi

    The following info doesn't say where to connect hoses, can someone please tell me for a Merc 1998 5.7 efi? Step 1 - Testing for an airbound/leaky system This is the easiest of the tests. For an airbound system all you need is the clear vinyl line and a couple of barbs. You do not need the gauge...
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    Mercruiser 5.7 efi fuel pressure tester kit from Autozone

    Hello, will someone be kind enough to tell me if the Actron/GM TBI fuel pressure tester part # CP7817 will work to test fuel pressure in my Mercruiser 1998 5.7 efi?? Thanks!!
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    Mercruiser 5.7 efi fuel pressure tester kit from Autozone

    Hello, will someone be kind enough to tell me if the Actron/GM TBI fuel pressure tester part # CP7817 will work to test fuel pressure in my Mercruiser 1998 5.7 efi?? Thanks!!
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    Twin 5.7 efi shut off at high rpm

    Hello, I wonder if someone knows how to fix the following: Took my boat for a spin, 1998 formula 280 ss twin 5.7 efi Bravo 3, everything fine for a while but when increased rpms around 4,000 after a minute or two both engines died, shut off completely. Open hatch and could only hear click click...
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    Formula 280ss versus Sae Ray 280ss

    Hello, Im looking to upgrade and have narrowed down my choices to a 1998 Formula 280ss twin 5.7 efi or Sea Ray 280ss twin 5.7 efi Although i like more the shape of the formula, the sea ray is almost 2000 pounds lighter (6300 vs 8200) therefore im thinking i would get better fuel efficiency or...
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