2.4 Bridgeport ECU

[woody]

Can't seem to get this thing to work , I have swapped everything from stock BP and it still will not rev . Starts and will idle but will not rev much and seems pig rich . New stator , new trigger, has good spark on all 6 . Must be ecu . What a pig , I hate EFI 2 strokes .

[25two.stroke]

My boss says the same thing. Lots of shops say the same thing. Most people out there "hate" efi 2 strokes. Thats because they are missing one of two things: knowledge of how to work on them OR tools to work on them. Not saying you don't know how to fix your motor, and I'm not trying to talk down on you, I'm just saying what has always been the case in my experience.

I just bought a 1997 150 efi from another dealer and they told me it needed an ecu. Bought it sight unseen for $500. Thats always a gamble. All they told me is it was a "clean motor" and needs an ecu. I get it here and open it up it is a spotless freshwater motor...missing the ecu. So yeah, it needed an ecu cause they pulled it and threw it away thinking it was bad. I put an ecu on it, started it up and it ran like ass. Running 3.5 cylinders and dumping fuel out the prop. I pulled the vst and intake off and found torn orings on two injectors so it was just spraying fuel everywhere in the intake. Thought the injectors looked funny so I flow tested them and they were cheap Chinese ones flowing 20% of the fuel volume they should've. Vapor tank was clean and pump made 40psi of fuel pressure. I put a good set of injectors in there and didn't jack the orings in the process...what do you know it ran perfect.

Moral of the story is that the other dealer changed everything except the ecu (cause you can't get them anymore) and it still didn't run right so they came to the conclusion that the problem was the ecu. When in fact the main problem they did to themselves. They probably had 1 bad injector and opted to change all 6 out with 6 NEW cause the aftermarket ones are so cheap. Little did they know they don't flow enough cause they didn't have a flow tester.

Carbs are not always the solution. When you burn the motor down cause they aren't jetted quite right...or wash a cylinder out then you might find yourself wishing you had fixed the efi system. Have you changed the injectors out with a flow tested set or had those flow tested?

[woody]

You are correct about me not having the knowledge or the tools for EFI two strokes , they came in quick and they left quick also .I have the tools for E-tec and am able to find my way around them most of the time . I have nothing but trouble with Merc EFI outboards , not saying that Merc is bad but I don't have the tools or the knowledge and will probably never look at one again .
Having said that , I pulled the cover of the ecu on my BP and looks like someone tampered with the adjustment dial on the front .There are 3 solder points with nothing attached , so I think it is toast .Mercury is my number one choice when it comes to marine engines , just not the two smokers !

[25two.stroke]

You are correct about me not having the knowledge or the tools for EFI two strokes , they came in quick and they left quick also .I have the tools for E-tec and am able to find my way around them most of the time . I have nothing but trouble with Merc EFI outboards , not saying that Merc is bad but I don't have the tools or the knowledge and will probably never look at one again .
Having said that , I pulled the cover of the ecu on my BP and looks like someone tampered with the adjustment dial on the front .There are 3 solder points with nothing attached , so I think it is toast .Mercury is my number one choice when it comes to marine engines , just not the two smokers !

Is there a map sensor in the ecu with a vacuum line going to it...or is that what is missing? Without that they won't run even with a tps. If you are worried about the fuel offset screw then you gotta get the old ass merc efi tester to check it. I have that tool. Most people don't. Without it good luck setting that.

[woody]

I think the fuel offset was broken off and then just taped back on , it would have to make contact with 3 pins poking out of the ecu to work . Correct ? I feel like I might as well work on one of Elon's Rocket ships because I am in the dark with this BP and always have been since I acquired it . Also to make matters worse , I can't make this thing charge and I have tried everything and I know how to work on the alt. on a outboard ?? Maybe it is just not meant to be or someone or something doesn't want me back in the water with this BP on my Jag . But thanks for your time trying to figure things out with me . Couple years ago I had 2 merc. 2.5 efi outboards and could not get anyone of them to run . Bolted on a set of carbs and boom it fired right up and ran like a champ and still is running perfect today . I hate efi outboards and they hate me also .

[25two.stroke]

Dammit.
Well yeah without the fuel offset potentiometer I don't think it will run right. I do not know cause I never broke one off. I also am not familiar with the circuitry inside the ecu...so I don't know what that goes to directly. If you put carbs on it I would be interested in the efi parts if you're looking to get rid of. Either Power Performance or Ox Performance makes a set of block-offs for the injector holes on a crankcase injected motor. Then you just need a set of carbs and an intake manifold/reed plate. I don't think they ever made a 2.4L carb motor with 7 petal reeds, but I know I have seen someone do it at some point. Not sure what intake manifold they used to bolt to the front half and put carbs on? I can look at my house to see if a 7 petal 2.5 reed plate would bolt to a 2.4L crankcase inj. front.

[woody]

I haven't decided what I am doing with it yet . I am going to clean the black slime from the front of my shop were that fat pig was chocking next .I am leaning towards building a 15" leg for a 225 looper I have , or looking for a 150 e-tec . I have 2 complete 2.5 efi fuel systems and maybe 2 complete 2.4 Bridgeport engines mines ecu and one needing a sleeve ??

[OnPad]

3 used ecu's for $350.https://www.ebay.com/itm/125834668971

[25two.stroke]

A27 is an early 2.5 ecu that needs an external tps.

[OnPad]

Been on my watch list a while now. I should be buying em, in order to get rid of the limiters on my 2.5's.

[25two.stroke]

Too old. Thats an accurate price for what they are. Not really a good deal. MAP is probably bad in one of them. Electronics have a lifespan and those are all at theirs IMO. Better off getting a real 11350 digital and putting John Marles' burned chips with whatever limiter you want in them. You can find used 11350 digitals for about 500 each. They run good and it beats paying 1500 a piece for new ecus.