A basic overview of OEM Marine EFI, Part 1 of the article I wrote last year - pages 23 thru 25 - the link below should take you right to page 23..

MEFI = Marine electronic fuel injection and brought about by GM Powertrain and Delphi. The article below

http://www.emconsultinginc.com/Digit...all_2014/#23/z

Miami bound to look at the cool 2015 marine stuff. and talk shop with many.

we built and ran mega squirt a couple of years ago...learned alot about what works and what does not...you really need to use a crank and cam sensor setup and a LS style coil packs to eliminate RFI interferance from ignition boxes and some dist's all the parts are available to do these now...just not a cheap deal..

John , how much did ford pay you to put the 351 on the top of the article lol .
Let us know what the people in the trenches have to say about what is going to power the next generation .raptor ,ls, vortec , miller cycle mazda v6's ,..

Nice article. I can't say I recall ever seeing that OMC EFI Windsor in a boat. But that remains my all time favorite engine platform, after I finally ran out of 4V Cleveland parts. lol. However I still didn't see that ECM or plug I was talking about in your list. Maybe because it was attached to factory sealed Mercury Racing engines rather than production models. I'd love to debate speed density vs MAF, open loop vs closed loop systems, or even new self tuning with wide band O2 options. But I think we've probably hijacked the thread far enough..

:hijack:

:food-smiley-007:Interesting thread this is. Now I know I'm going to keep my Holley 850's and Victor Jr's because I don't understand anything I just read.

your not editing the source code per say,,your editing tables.hard part of editing is finding the pattern in the eprom to say its a table.then figuring out what that table actually does.
I too used to mess w/ this stuff,,Raytheon loved when I'd hook up to my trucks computer and see what eprom address was being accessed when you changed any 1 of the multiple sensors,,the old days sucked,today its so much better,,thanks to guys like John Meaney,creator of multiple tunable efi systems.

That Ford 5.8 MPI picture in the article was in my shop and had a running problem. Not many marine shops would work on it being a Ford marine app. Anyways it would start and run first time out but would only run to about 3200 - 3500 rpms while throttling up, then would completely shut down, after shut down the engine would restart sometimes hours later and sometimes not at all.

Anyone take a guess what the problem was ? It was not vapor lock, I sold my scan tool for the Ford OMC / Volvo apps many years ago so really had to think outside of the box to fix that one.

Fords are notorious for the ignition module doing things like that.

The module was the first thing I thought it was. So that was a good place to start but it was not the problem here. The module was good and not a fuel problem of any sort.

Well, without a scan tool I would have done the obvious things first. Toss a timing light on it to watch total timing, as well as parallel in a scope to the injection harness. One of the two is dropping out. Also seen injectors start to short internally and take out the injector driver.