Mercruiser ECM replacement?

[alldodge]

Ebay injectors in most cases are junk. Injectors cannot be rebuilt cost effective. It cost more to rebuild one then replaced. Injectors can be cleaned and then tested to determine if they can be used, but not rebuilt

To find out, have yours cleaned and flow tested

 

[Tail_Gunner]

Tail_gunner,
1. Yes the motor revs higher when in neutral.
2. Original Model number 17086237 GM Rochester 0x55, I bought a pair of remanufactured ones from eBay as the oem were way too expensive!
3. Don't have a clue! I used the propeller that came with the boat when purchased.
4. How can I help identifying what it is? Send some more pictures of the carb?
Many thanks,
Kostas

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 meant to be at all. For that matter does your mech have working knowledge of marine tbi injection...

 

[Ferrarakias]

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 meant to be at all. For that matter does your mech have working knowledge of marine tbi injection...

Dear tail_gunner,
Not been insulted at all. I have zero knowledge regarding marine fuel injection! Paid the best well known mercury mechanic in my area (Athens, Greece) to install the motor back in the boat and have it working properly. His conclusion was that I need a new ecm, as already told you in my first post. I'm reluctant to order a new ecm though through eBay as the cost is not irrelevant and in case it's not the correct one, it will only add to what I already paid the mechanic and all parts that were replaced.
All I ask from you is advice how to proceed and sort this problem out.
Please bear with me.
Kostas

 

[Ferrarakias]

Ebay injectors in most cases are junk. Injectors cannot be rebuilt cost effective. It cost more to rebuild one then replaced. Injectors can be cleaned and then tested to determine if they can be used, but not rebuilt

To find out, have yours cleaned and flow tested

Alldodge,
Please excuse me, injectors were used, cleaned and tested not rebuilt. I can find the ebay seller and let you know, but it's been more than a year ago.
Kostas

 

[Tail_Gunner]

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 follow those procedures to the letter. Marine timing is very unique, not at all like automotive...speaking to that...did you replace the distributor...they to are quite unique and very a bit over the yrs. One model yr will not function in other yrs.

Take a picture of your new Ecm...it has two identifying numbers...
1 the part number
2. The actual software installed for a spefic engine..and to take it further one can have a Mefi 1 hardware with Mefi 2 software.

Once the engine has been timed correctly and using the proper distributor you can attempt to bring it up to WOT. If it does not go there....well your going to need a code reader....Mefi 1 does have a knock sensor and a engine protect mode. Both will keep the engine from developing full power.

Below is a pic, see the bar code and the numbers below it? Those numbers indicate the tune inside the Mefi housing.

 

[Tail_Gunner]

Ignition Timing - Mercury MerCruiser MCM 454 Mag MPI Service Manual [Page 60]

Mercury MerCruiser MCM 454 Mag MPI Manual Online: Ignition Timing. Two items of test equipment are required: an inductive pickup timing light and a Scan Tool. 1. Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect power 2. Connect a shop tachometer to engine.

www.manualslib.com

 

[Tail_Gunner]

Ignition Timing - Mercury MerCruiser MCM 454 Mag MPI Service Manual [Page 60]

Mercury MerCruiser MCM 454 Mag MPI Manual Online: Ignition Timing. Two items of test equipment are required: an inductive pickup timing light and a Scan Tool. 1. Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect power 2. Connect a shop tachometer to engine.

www.manualslib.com

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

 

[Ferrarakias]

If you find the block casting number it can be looked up at mortec.com

alldodge,
Found some casting numbers:

*0266*

GM 5.7LG SGI

Are these correct?

Can Chris please advise whether the correct ecm is indeed 861078T1 for the roller cam?

Kostas

 

[alldodge]

The casting number has more digits. Should have commented at the time, but the arrow in Chris pic is pointing to the wrong location. Look below the distributor on the port side. The number will be at least 6 digits

 

[Lou C]

The casting numbers are on the rear end of the block, behind where the cyl head bolts on, this is a 4.3 V6 but the V8s are the same.... check both sides, this pic is from when I replaced the cyl heads back in '17. 1988 4.3 with roller cam. The V6s I think got the roller cam a little earlier than the V8s. The number in Chris's pic is a GM serial number, on the V6s it has a letter first that denotes the plant of manufacture, T=Tonawanda NY,
R=Romulus Michigan. 1st pic is the actual # on mine. On most they are behind the driver's side cyl head.

 

[Tail_Gunner]

alldodge,
Found some casting numbers:

*0266*

GM 5.7LG SGI

Are these correct?

MERCRUISER : 5.7L EFI (2 BBL.-TBI) GM 350 V-8 1997 : 0K001506 THRU 0K999999 | PerfProTech.com

Online shopping for MERCRUISER : 5.7L EFI (2 BBL.-TBI) GM 350 V-8 1997 : 0K001506 THRU 0K999999 Parts & Accessories

www.perfprotech.com

MERCRUISER : 5.7L EFI (2 BBL.-TBI) GM 350 V-8 1997 : 0K001506 THRU 0K999999 | PerfProTech.com

Online shopping for MERCRUISER : 5.7L EFI (2 BBL.-TBI) GM 350 V-8 1997 : 0K001506 THRU 0K999999 Parts & Accessories

www.perfprotech.com

Kostas

 

[Ferrarakias]

Gents,
Have just found this listing

Factory REMAN ECM for Mercruiser 5.7L EFi GM 350 V8 861542R2 | eBay

Find many great new & used options and get the best deals for Factory REMAN ECM for Mercruiser 5.7L EFi GM 350 V8 861542R2 at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

Will this work with my engine?
Please let me know.
Kostas

 

[alldodge]

Its from a 1998 5.7 EFI which is a roller cam motor
If (the big if) it does work, it should work for your motor. Would like to know the casting number to help clear up some uncertainty

 

[Tail_Gunner]

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 have a flat tappet.

Vortec valve covers have a center bolt to hold them down. That is the key. Below have a look.See a pattern there?

CHEVY GMC CENTER BOLT 5.0 5.7 V8 VALVE COVERS

CHEVY GMC CENTER BOLT 5.0 5.7 V8 VALVE COVERS

www.cfrperformance.com

Your serial numbers show your engine in a transition yr...

MERCRUISER : 5.7L EFI (2 BBL.-TBI) GM 350 V-8 1997 | PerfProTech.com

www.perfprotech.com

 

[Tail_Gunner]

Gents,
Have just found this listing

Factory REMAN ECM for Mercruiser 5.7L EFi GM 350 V8 861542R2 | eBay

Find many great new & used options and get the best deals for Factory REMAN ECM for Mercruiser 5.7L EFi GM 350 V8 861542R2 at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

Will this work with my engine?
Please let me know.
Kostas

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 at that.

Below is a link to have your existing Eck reprogrammed. By far more accurate reliable and less expensive. Flea Bay is not a place for such purchases. Call them talk to them, they are intelligent and understanding. For that matter I am quite sure they have done work in your own country many times.

OBD Diagnostics

mefiburn.com

Ok Gunner now you done it.

As to your injectors, below is a link to the proper injectors.

Marine Fuel Injectors - Multi-Port and Throttle Body

Marine Fuel injectors for Mercruiser, Yamaha, Mercury, Bravo, 350 MAG, F115, F150, Volvo Penta 4.3L and 5.0L

m.motormanfuelinjection.com

Bingo

17104288 Mercury Marine | Volvo Penta Fuel Injector TBI Set

Motor Man Reconditioned Marine Fuel Injector For Mercruiser, Crusader, Volvo Penta, Marine Power 350

m.motormanfuelinjection.com

 

[Lou C]

Vortec engines have 8 bolts holding down the intake manifold whereas pre Vortec engines have 12 bolts.

 

[Tail_Gunner]

Vortec engines have 8 bolts holding down the intake manifold whereas pre Vortec engines have 12 bolts.

Perfect reply and definitive.

 

[alldodge]

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 have a flat tappet.

Vortec valve covers have a center bolt to hold them down. That is the key. Below have a look.See a pattern there?

Post 1, pic 3 shows center bolts holding cover

 

[Tail_Gunner]

Post 1, pic 3 shows center bolts holding cover

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 holding down the intake.

8/vortec
12/ tbi

 

[Ferrarakias]

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 holding down the intake.

8/vortec
12/ tbi

Have some pictures in file, any definite conclusions?