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    Setting MEFI 3 base timing

    I am hoping someone who has first hand knowledge of setting base timing on a MEFI 3, 7.4 MPI engine can answer a couple of questions. I know what the procedure is and I tried it last weekend, but suspect it did not work as it should. 1. When I shorted the A and B pins together I did not notice...
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    Transmission drive plate

    An interesting find, this past winter I decided to rebuild/re-freshen both of my engines. New gaskets, seals, rings, bearings, etc, and also to check there were no components that may need replacing due to age, wear. When removing the transmission from the port engine I found that one of the...
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    Fuel Cooler White Paste?

    Does anyone know what the white paste is between the bracket and the fuel pump and fuel cooler? And if you know what it is where can I get some. It almost looks like the paste that sits between the cooling fan and the computer processor/chip in a PC. Some sort of heat transfer paste? 7.4 MPI...
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    Forward cabin trim how to remove?

    Does anyone know how to remove the rectangular piece of trim that sits directly above the forward cabin port lights? As seen in the picture.
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    Recommendation for rebuilt cylinder heads

    Last winter when I replaced my exhaust manifolds, elbows and risers, I noticed severe corrosion in some of the exhaust ports, but at that time did not want to get into removing/replacing heads. Of course this issue bugged me all season and I decided this winter to replace the heads. Today I...
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    MEFI 3 to MEFI 4 conversion

    Quick question, I am converting from MEFI 3 to MEFI 4 on my 7.4 Mercruiser, as the original ECU died. I have the conversion kit from OBD Diagnostics. However it did not come with any install instructions. It is fairly obvious but just one thing I am not sure of. Do you have to plug the 10 pin...
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    Exact location of ECU ground?

    Does anyone know the exact location of the ECU ground on a 7.4L MPI MIE L29 GEN VI equipped engine, as found in my 2000 MY 340 Sundancer. I know there are two ground wires on the back of the engine on a single stud, I think one is the ground from the battery, is the other one the ECU ground? If...
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    Engine ECU swap for diagnostic purposes?

    Does anyone know if I can swap the engine ECU's to help me either find my intermittent port engine problem, or to at least rule out the ECU? Boat is a 2000 340 Sundancer with twin 7.4 Mercruisers. Thanks Andy
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