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  1. Tail_Gunner

    Mercruiser ECM replacement?

    Number 2 intake runner, notice the bolt and the bore...the bore hole is milled flat. With that being said, I am quite sure going to a carbed engine is going to be far less costly. This newer engine is more that probably set up for a newer ecm. Actually around that time frame merc dropped Mefi...
  2. Tail_Gunner

    Mercruiser ECM replacement?

    Are you sure Lou? Blow the below pic up, notice the first intake bolt. The intake bore is filled flat. There are two pics, look closely. That would be a vortec intake
  3. Tail_Gunner

    Mercruiser ECM replacement?

    A engine of this magnitude? Little drama going on there, look at the comprehension ratio and cam profile. Not a TBI candidate. https://www.corvetteforum.com/forums/c1-and-c2-corvettes/2211790-crate-motor-casting-number-10243880-a.html Well maybe, that Chevelle forum can be very accurate...
  4. Tail_Gunner

    Mercruiser ECM replacement?

    Below is a product that excells, just be sure to test it on any plastics. https://www.crcindustries.com/products/contact-cleaner-2000-174-precision-cleaner-13-wt-oz.html
  5. Tail_Gunner

    Mercruiser ECM replacement?

    Ive found the timing protocols, to the original poster the below procedures are used to time your engine..Do not vary. The DLC is simply the Data Link Connector located near the MEFI 1. You can jumper the A / B ports to get the ECM into base timing mode. You can do this with a paper clip...
  6. Tail_Gunner

    Mercruiser ECM replacement?

    Which is why I wanted to see the intake manifold...smiles its all telling. Now that you bring up this new engine..the serial number is quite relevant. It is eye opening to see how European country's approach US made boats and Rv's. Lots of hands on fabrications... A question is that stern...
  7. Tail_Gunner

    Mercruiser ECM replacement?

    Quite a good file, I lost it yrs ago. However have a read it is long but accurate. https://drive.google.com/file/d/0B3waQufF7aAAQnVaNmlWQUI0Z2s/view?usp=drivesdk&resourcekey=0-hZbGvZGIIlqmO52Cjv3Drw
  8. Tail_Gunner

    Mercruiser ECM replacement?

    Looks like you have matching part numbers. Now on to your serial number. With that being said was that engine rebuilt? It look pristine, a big issue can be the coolant temperature sending unit. There are many types and only one for tbi. I see your reply below, besides the coolant sender you...
  9. Tail_Gunner

    Mercruiser ECM replacement?

    Below are pics of intakes, the 8 bolt pattern is true vortec. Speaking to why that is important, the vortec head improved engine performance enough a new tune was required. That is at the heart of this conversation.
  10. Tail_Gunner

    Mercruiser ECM replacement?

    Lou cleaned it up, it's the intake bolt pattern. 8 vs 12. I'm quite sure he has Tbi heads but one never knows. And vortec heads vs tbi heads is a big deal in programming a file. Again a picture of the intake/valve covers will define things so you can move move forward. Or just count the bolts...
  11. Tail_Gunner

    Mercruiser ECM replacement?

    Perfect reply and definitive.
  12. Tail_Gunner

    Mercruiser ECM replacement?

    Probably not, call or contact the vendor and ask point blank if the unit has software in it. Ive taken some time to look at those old Mefi units on eBay. All the units i have seen do not contain any programming what so ever. Your tinkering with history here and it will be a journey...expensive...
  13. Tail_Gunner

    Mercruiser ECM replacement?

    Mortec will identify that block in all the avaible combinations. 2bolt main/4bolt main...roller cam vs flat tappet. Make this simple, take a pic of your valve covers, there are vortec heads and non vortec. If you have vortec heads then you have a roller cam if you do not have vortec heads you...
  14. Tail_Gunner

    Mercruiser ECM replacement?

  15. Tail_Gunner

    Mercruiser ECM replacement?

    https://marinepowerusa.com/wp-content/uploads/2019/08/ELECTRONIC-FUEL-INJECTION-MEFI-1-2-5.7L-350CID-8.2L-502CID.pdf
  16. Tail_Gunner

    Mercruiser ECM replacement?

    https://www.manualslib.com/manual/1813938/Mercury-Mercruiser-Mcm-454-Mag-Mpi.html?page=60
  17. Tail_Gunner

    Mercruiser ECM replacement?

    And your overseas...First and foremost would be parts availability....it's very poor here in the US one can only imagine what it is like in Greece. Perhaps Alldodge has the correct timing procedure for both Mefi 1 and two...I no longer have manuals and my memory is highly suspect. If posted...
  18. Tail_Gunner

    Mercruiser ECM replacement?

    Just a quick question. Does your mechanic know your engine is not preforming correctly? If so are you sharing what's being posted here with him/ her? I take it you have very little working knowledge in regards to marine fuel injection. Do not be insulted by those questions plzz . They are not...
  19. Tail_Gunner

    Mercruiser ECM replacement?

    Just a few thoughts. 1. Can you rev the motor up to 3500/4000 rpm with no drive engagement? Beware just a slow very short burst...think in seconds of time..like 2. 2.You replaced your injectors? What are the model numbers? 3. I have to ask...your prop pitch? Say 17? 4. I assumed this engine...
  20. Tail_Gunner

    Mercruiser ECM replacement?

    Geez feeling a smidge crabby are we? Remember not to many people have your working knowledge of marine efi...and then there is the availability of the correct injectors and the cost. Resurrecting a old Slobber Body can be quite romantic to a highly skilled marine guy. But a rather arguious task...
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