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    Chattering in out drive

    Was the drive trimmed up/out when running?
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    Tune-up

    Poor quality/incorrect components, timing off, firing order incorrect, carburetor adjustment, etc...
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    Volvo 5.0 gxi Stalls at idle. Hard start.

    OP needs diacom to graph/record data items for comparison and perform any available tests on specific components
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    Couple issues

    Would only expect fuel to be hot enough to boil in the case of an extreme overheat, or vapor lock on a hot, idling engine At 3500 rpm the engine cooling system, if sound ought to be keeping the motor cool enough to run at optimum temp. The fuel in the delivery system won't be there long enough...
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    4.3l Mercruiser - failed hose test see comments

    In that case there is a plug(s) not installed, hose(s) loose/not connected properly, or worse a pushed out casting plug or crack in the block or manifold(s) You need to run the engine with a good water supply and look to exactly where the water is coming from What does the engine oil look like?
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    Outdrive Wont Go Up

    The trim pump wiring is in the pictured condition and your wondering why you're having issues? The trim pump wiring/solenoids needs replaced completely Look into getting the latest style oildyne pump assy. Will connect right up to your existing boat wiring/trim lines and work well. Really...
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    4.3l Mercruiser - failed hose test see comments

    Sounds like you're referencing the intake manifold drian plug located on the fwd side of intake just above the circ pump If the engine is run with a sea water supply and the plug is not in place water would leak out the hole Where down low on the motor did you see water leaking? Pictures help...
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    Couple issues

    First guess is something temporarily blocking the pick up tube in the tank. When you come off plane/throttle back the debris eventually comes off the tube and your back in business What does fuel boiling issue mean?
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    Couple issues

    Still don't know what a fuel boiling issue is nor have you given any description of what you're experiencing with the motor. Guessing it's running poorly, can you give us any more information?
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    1986 Mercruiser 470 dist cap and rotor

    Distributor cap is based on the distributor make/model not car Should have an ID tag on the distributor, prestolite and mallory were common on 1986 mercruisers
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    4.3 TKS starts then stalls - solved

    Cool story, but a new switch isn't likely to fix the issue WAG is lower shift cable is worn/misadjusted
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    LiFePO Batteries ???

    You want to spend less and save weight on batteries only to have to add/change accessories to allow the batteries to work properly and you are unsure of what/how to set them up? Not sure if you're speculating here or are absolutely sold on the idea but based on your first post the current...
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    Using boat with a bad trim

    Probably be okay as long as the trim works electrically. Just keep an eye on it Have you seen any oil leaking externally? Oil slick on the water?
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    Using boat with a bad trim

    On the side of the transom assy, down low. Flat head screw head on the valve Righty tighty, lefty loosy
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    Electrical

    Maybe, have you load tested the batteries? Clean tight connections, not missing any +/- leads at the battery? Is the alternator maintaining charge properly?
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    Using boat with a bad trim

    Is the manual tilt valve unseated?
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    SX-M outdrive not going into reverse consistently

    Yes, definitely change/inspect the gear oil. Was it changed recently? SX M drives work best with a quality GL5 rated lube Issue could be simple as a shift adjustment/worn cable. Need to inspect that before swapping drive parts
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    Power Trim Question...

    Have someone stand on the drive while you trim down. If still nothing bounce gently until it trims in Work around for the future is relieve the pressure once the drive reaches full up/out position. Bump it down once quick and your set
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    No power at dash

    Might not matter at this point. You say the fuse panel isn't receiving 12 + volts? If nothing at the dash works the issue is power supply to the dash. Loose/missing connection from the motor to the helm Is the lanyard switch on?
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    95 4.3lx alpha one mercruiser cooling system question

    The mating surface/oring you're referring to is on the pressure/output side of the pump. It would be leaking water if it's failed not drawing air in Would be obvious on muffs with a sound sea water pump
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