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    Mercruiser 5.7 260 EFI - Water Temp Fluctuations

    Hello, I have twin 1998 5.7 260 EFIs 0L067794/0L067XXX in my Formula with raw water cooling. I would like to ask your opinion as to why I have temperature fluctuations while underway at certain points. I would like to know if it is an indication of any potential problems. When I am under load...
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    Mercruiser 5.7 EFI Water in Oil

    Hello and thank you to whoever reads this post. My starboard engine is a 1998 5.7EFI 260hp with a Bravo III sterndrive. I winterize every year according to the mercruiser manual and add anti-freeze to the cooling system. I do this in my backyard on my hoist, where is stays fully covered for...
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    Merc 5.7 TBI Stalling Shifting Into Gear

    Hi, I have twin 350 5.7 TBIs with B3s, which stall when shifted into gear. More often when warm and port more than stbd. I also have noticed a drop in rpms when applying throttle just off idle before take off. I have new cap, rotors, wires, iac and tps are newer. Engines have been...
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    350 5.7 TBI Throttle Cable Issue

    I have an issue with my port engine throttle cable. By the time the throttle handle reaches full swing, it's nearly an inch and a half further than the stbd side but yet is 300 rpms behind the stbd engine. Is the cable stretched or in need of adjustment. Any help is appreciated. Thanks
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    All gauges on starboard engine are slightly lower compared to port

    Hello, had all VDO gauges that needed replacing on a newly purchased boat. Before replacing I noticed that all the starboard side gauges like oil psi, rpm, temp and trim are all a little lower. I since replaced them all, since the faces were falling off and I still have the same problem. There...
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    350 5.7 EFIs Lose RPM Under Electrical Load

    Hello, I have a 1998 formula with twin 5.7 medics that are efi. While at idle, if there is an added electrical load like trim or outdrives, both engines lose 100-200 rpms. Let go on the outdrives or tabs and rpms are restored. I also wondered if it was related to engines dying in gear before the...
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    Recommissioned Merc 5.7s EFI Bravo 3 Die In Gear

    Hello, and thanks for reading. My 1998 Formula 280 ss has 5.7 EFI with Bravo 3s. I had no issues at all before winterization. Engines were muffed and fogged. Upon recomissioning, engines started right up and both revved fine with no stumbling. When I shift into forward or reverse both...
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    Potential Mechanic Negligence on OMC

    Forum friends, I was recently having some electrical problems with my ignition. I replaced some components and was running fine when it died again. My troubleshooting skills didn't seem up to the task so I let my marina mechanic do the job. Unknown to me, a different guy fixed the problem. I...
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    Do Audio Systems Cause Ignition System Failure

    Hey folks, I am trying to eliminate the causes of my engine cutting out. The first time I was towed I had no spark at the distributor module. I ran some tests and it appeared to be the coil. So I replaced coil and it seemed to fix the problem. I also replaced plugs at same time. However, I...
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    How Much Rot Is Too Much Rot?

    Forum, that may be a dumb question. My Four Winns 225 Sundowner began to leak at the transom mount. I inspected with a mirror and light, along with some tapping to determine how much rot is occurring, and discovered some rot starting at the drain and going about 5 or 6 inches above the bottom...
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