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    Mercruiser 5.7 won’t make power

    That's a problem. Engine/drive is trying to push/lift all that fuel in front of it located too far away. Think of a lever/fulcrum. Your fulcrum (fuel tank) is too far forward of the lever (engine/drive). Even with a huge diameter, low pitch prop on it you will continue to have issues. The...
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    Idles great / misses when throttled up

    jaded
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    Mercruiser 5.7 won’t make power

    Your problem is obvious. Judging from the first and only picture you've posted you have a tri toon wIth an sbc v8. You've added the middle full tune in lew of the original tapered front motor well. The new mid toon had a 5" lower transom than the original motor well. You've modified the aft...
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    Engine runs fine. Won’t start after it gets warm.

    You may be experiencing one of or both of two issues. One is the carburetor is flooding out upon shutdown thus flooding the engine. The other is loss of ignition spark. To check for carburetor flooding, upon shutting off a warm engine immediately inspect the carburetor. Remove the flame...
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    Having trouble finding points to elec conversion kit. 91 3.0 mercruiser.

    Pretty sure sierra sells the full line of mercruiser points ignition upgrade complete distributors, drop in/plug n play. As far as merchandise in stock or quality of said merchandise, unknown..... I usually only go to sierra for specific parts or as a last resort, ymmv
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    Mercruiser 3.0 diagnosis / serial number decode

    Yes, but the actuator arm for the pump looks short/broken
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    Surging / losing rpm

    Sounds to me like you definitely have an ignition issue. Cutting out cold then firing back up immediately usually rules out fuel supply. From previous posts you mention new spark plugs, have you inspected/changed out any other tune up parts? Judging by provided info I'll guess you have a...
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    Shifter is turning the upper shift shaft when put in forward or reverse.

    In both pictures you've posted neither show the shift shaft in the bell housing to be properly oriented to remove/install the drive. The bottom fork portion of the shaft needs to be oriented straight fore/aft for the drive removal/installation. A standard rotation alpha style drive must be in...
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    Mercruiser 5.7 won’t make power

    Sounds like a Delco hei/est distributor. And no, the electronics don't self time. The operator sets initial timing following proper protocol, the module advances the timing with rpm increase Sounds like a thunderbolt distributor with old style, two wire ignition sensor Post a picture of the...
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    Mercruiser 5.0 MPI fuel problems

    Possible issue with the fuel pump relay/associated circuitry My thought is based on your info provided there is a problem with the fuel supply to the pump. Vent line partially blocked, anti siphon valve sticking/failing, fuel pick up issue in the tank, etc....
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    Shifter is turning the upper shift shaft when put in forward or reverse.

    If it is indeed a counter rotated alpha style drive both the helm shifter and drive need to be in reverse gear for removal/install
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    Mercruiser 5.7 won’t make power

    Four + times in this thread people ask OP, "Have you verified timing advance?", with no response from OP, not even an acknowledgement of the question. I know the ignition system was replaced and issue is still there but just so that very simple check can be performed/verified I'll ask. OP: Have...
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    Engine Misfire!

    Did you inspect/replace any other tune up parts? Cap/rotor, fuel filters, check/set timing/idle? First guess is fuel starvation at higher rpm/load. Inspect the fuel delivery system from tank to carb, fuel pump pressure/vacuum
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    Mercruiser 3.0 diagnosis / serial number decode

    You are referring to the shift interrupt switch. It grounds the ignition system momentarily so the drive can be shifted out of gear into neutral. Yes, if the switch is activated the ignition system will not work
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    Mercruiser 4.3 ThunderBolt - Need help summerizing

    One on left looks like garboard/hull plug. The one on right is possibly an anode plug for a heat exchanger. Is the engine closed cooled?
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    Shifter is turning the upper shift shaft when put in forward or reverse.

    Is the drive you removed a counter rotated drive?
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    7.4mpi just started running rough and with gas coming out exhaust

    You need to test for continuity between the injector leads and whichever pins connect accordingly to the ecm. Oem wiring diagram will be needed to figure out which pins need to be tested
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    Mercruiser 3.0 diagnosis / serial number decode

    Yes The tune up info you seek should be on the engine. Your first post has a picture that shows the engine information sticker. It's red and located on the valve cover just below the shift plate
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    Manfiold and elbow gasket replacement / torque and bolt question

    Iirc the torque spec for manifold/riser is 25-35 lb/ft. Only reason I remember is to me it seems low but it is the spec. Can't recall ever using a torque wrench on those bolts, my method is tighten, run it and move on the next project, ymmv
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    Starting problems.

    Clean where it needs to be, would be a pleasure to diagnose irl. At this point, given information would suggest you're beyond internet help. I have no idea why you've removed valve covers/displaying photos of the flywheel/ring gear
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