HELP 2005 5.0 MPI OVER REV

Regal_2250 · Oct 17, 2022

2005 Regal 2250 (22.2 feet)
5.0 MPI ALPHA 1 Gen 2
Boat weight I belive is around 3700lb with 54gal fuel cap.
Eng Ser. 0W326550
Typically riding with 3 or 4 adults and 75 percent fuel.

This is a new to me boat and it has been a nightmare. First ride, noticed she would bog out if you accelerated too quickly. And then I lost the ECM, she would not start the fuel pump to fire engine. Fast forward all summer sat on the trailer I finally bought a "new Ecm" from Texas, it appears to be new but a reflash. They told me it's part number or Calibration is 866189T06 which is what my boat is supposed to have superceded to from 865926 ecm (Allthough that number is not located on the ecm itsself) So I install a new ecm, and we also determine the map sensor was gone. Sea trial, no more bogging at all, but now I hit the throttle and she was running all most 5800rpm at 46 to 48 MPH. So I immediately backed her off and for the rest of the run I cruised at about 4000RpM and 23 to 25 MPH. I'm running out of patience and money can someone please offer any advice. This boat is sinking me. The ECM was 3400 Canadian, and 700 for diagnostic and map sensor plus sea water pres. Sensor. The prop on the boat is a Vensura 19P stainless 4 blade RH. And my location is east coast Canada used in Atlantic Ocean coastal waters. I am wondering about 1, verifying the calibration on the ecm to ensure I got what I was sold, and 2, switching the prop out to a quicksilver nemesis 4 blade 23P. ..

Also when I took is home to rinse the engine on the muffs when I initially tried to start it the fuel pump wouldn't come on, I nearly had a stroke, I flicked the relay and it came on. Maybe sticky. Who knows.

Scott06 · Oct 17, 2022

Regal_2250 said:
2005 Regal 2250 (22.2 feet)
5.0 MPI ALPHA 1 Gen 2
Boat weight I belive is around 3700lb with 54gal fuel cap.
Eng Ser. 0W326550
Typically riding with 3 or 4 adults and 75 percent fuel.

This is a new to me boat and it has been a nightmare. First ride, noticed she would bog out if you accelerated too quickly. And then I lost the ECM, she would not start the fuel pump to fire engine. Fast forward all summer sat on the trailer I finally bought a "new Ecm" from Texas, it appears to be new but a reflash. They told me it's part number or Calibration is 866189T06 which is what my boat is supposed to have superceded to from 865926 ecm (Allthough that number is not located on the ecm itsself) So I install a new ecm, and we also determine the map sensor was gone. Sea trial, no more bogging at all, but now I hit the throttle and she was running all most 5800rpm at 46 to 48 MPH. So I immediately backed her off and for the rest of the run I cruised at about 4000RpM and 23 to 25 MPH. I'm running out of patience and money can someone please offer any advice. This boat is sinking me. The ECM was 3400 Canadian, and 700 for diagnostic and map sensor plus sea water pres. Sensor. The prop on the boat is a Vensura 19P stainless 4 blade RH. And my location is east coast Canada used in Atlantic Ocean coastal waters. I am wondering about 1, verifying the calibration on the ecm to ensure I got what I was sold, and 2, switching the prop out to a quicksilver nemesis 4 blade 23P. ..

Also when I took is home to rinse the engine on the muffs when I initially tried to start it the fuel pump wouldn't come on, I nearly had a stroke, I flicked the relay and it came on. Maybe sticky. Who knows.

Yes fuel pump relay sounds like it needs replacement.
do you know the drive ratio on the alpha gen 2 ? I assume 1.62.

i would verify your tach first likely it is off as 5100-5200 the rev limiter kicks in. do this before messing with props . I run a vensura , a nemisis would be a down grade in prop. Ive run both nemisis,/ spitfire (quicksilver/mercury names of same prop) doesnt hook up very well.
i found the vensura to give very good holeshot, but landed on a revolution 4 as it gave better overall performance.

Regal_2250 · Oct 17, 2022

Scott06 said:
Yes fuel pump relay sounds like it needs replacement.
do you know the drive ratio on the alpha gen 2 ? I assume 1.62.

i would verify your tach first likely it is off as 5100-5200 the rev limiter kicks in. do this before messing with props . I run a vensura , a nemisis would be a down grade in prop. Ive run both nemisis,/ spitfire (quicksilver/mercury names of same prop) doesnt hook up very well.
i found the vensura to give very good holeshot, but landed on a revolution 4 as it gave better overall performance.

I am absolutely still figuring out all the bugs as stated prior to ECM failure I couldn't get the acceleration or top speed to reach as the MAP was faulty. Now thay I replaced that and put in the new ECM she's got the power. She's idle at around 1000 and sounds fine, she did not seem to be "bouncing off" any rev limited and I should not that I forgot my alarm was unplugged until I got home. She was sold to me with it unplugged due to the sensors being faulty . You suspect I may very well propped correctly ? Where should I start to check my tach is functioning properly? I'm only semi capable with electrical I must add. Any help appreciated. Analog factory Guages on this boat.

Scott Danforth · Oct 17, 2022

Your idle should be 650 RPM. There is no fuel map above 5200, so the only way for the motor to get to 5800 RPM is to manually spin it that fast. It won't get there on it's own

I suspect your tach is significantly off

Regal_2250 · Oct 17, 2022

Scott Danforth said:
Your idle should be 650 RPM. There is no fuel map above 5200, so the only way for the motor to get to 5800 RPM is to manually spin it that fast. It won't get there on it's own

I suspect your tach is significantly off

I am now suspect. To be honest it was showing closer to 6000. Would the engine be bouncing off rev limiter? She sounded relatively smooth but I was concerned with the Guage so I slacked off. See photos.

Scott Danforth · Oct 17, 2022

Regal_2250 said:
I am now suspect. To be honest it was showing closer to 6000. Would the engine be bouncing off rev limiter? She sounded relatively smooth but I was concerned with the Guage so I slacked off. See photos.View attachment 371838 View attachment 371839

Unless you paid money to balance the motor and to pay for engine fuel maping. It can't turn 6000 RPM

My guess is your tach is set to 6 cylinder and you were turning 4800 RPM

You will know when you bounce off the rev limiter

Regal_2250 · Oct 17, 2022

Is there a chance that the new ECM I have installed is not the right calibration that's throwing off the Guage? I have a read out of the old faulty ecm before it failed and no indication that there was a tach issue. Hiw do I verify the tach setting

Scott Danforth · Oct 17, 2022

Regal_2250 said:
Is there a chance that the new ECM I have installed is not the right calibration that's throwing off the Guage? I have a read out of the old faulty ecm before it failed and no indication that there was a tach issue. Hiw do I verify the tach setting

Your tach has a switch on it's side to select number of cylinders

ECM has nothing to do with tach reading

Regal_2250 · Oct 17, 2022

I am going to check this asap. Thanks everyone. I'll be back with an update. Maybe the engine is not over revving at all and I don't need a prop change

Scott06 · Oct 17, 2022

Regal_2250 said:
I am going to check this asap. Thanks everyone. I'll be back with an update. Maybe the engine is not over revving at all and I don't need a prop change

Exactly. You woukd know if you hit the rev limiter you would feel it miss..

try cycling the cylinder selector switch on back of tach and make sure its on 8 cylinder. verify with a shop tach.

was this boat flooded or sunk?

Regal_2250 · Oct 17, 2022

Gosh I hope not lol. Never know I suppose. I will try the cycling the switch tomorrow. Don't have a shop tach, how does that work to verify?

Scott06 · Oct 17, 2022

Regal_2250 said:
Gosh I hope not lol. Never know I suppose. I will try the cycling the switch tomorrow. Don't have a shop tach, how does that work to verify?

Depends on which one you have Old school ones you connect to negative side of coil and a ground, i have a newer wireless one just hold near engine after setting cylinders and cylces…newer timing lights have a tach in them

worth a couple buck invetsment. I still use my dads 60s vintage “All American” tach and dwell meter On my 65 Pontiac. while the Sun tach dwell meter i bought in high school died, the $29 craftsman timing light still works… and yes its been a few years since i was in school…

you can get loaner tools at a lot of auto parts stores, all u want to do is compare dash tach to shop tach. might just be on six cylinder…

Regal_2250 · Oct 17, 2022

Gosh I hope not lol. Never know I suppose. I will try the cycling the switch tomorrow. What

Scott06 said:
Depends on which one you have Old school ones you connect to negative side of coil and a ground, i have a newer wireless one just hold near engine after setting cylinders and cylces…newer timing lights have a tach in them

worth a couple buck invetsment. I still use my dads 60s vintage “All American” tach and dwell meter On my 65 Pontiac. while the Sun tach dwell meter i bought in high school died, the $29 craftsman timing light still works… and yes its been a few years since i was in school…

you can get loaner tools at a lot of auto parts stores, all u want to do is compare dash tach to shop tach. might just be on six cylinder…

A friend of mine has a timing light, will this give me a rpm comparison

Scott06 · Oct 18, 2022

Regal_2250 said:
A friend of mine has a timing light, will this give me a rpm comparison

not every timing light has a tach feature. If its a modern digital one like an Innova with a tach built in then yes, if its an old school one like mine then no.
talk to your friend if he has a timing light and knows how to use it ( rare skill these days) likely one way or another he has a tach to set idle speed…and can probably walk you through what u need to do…

Lou C · Oct 18, 2022

Even when set right boat tachs can be off by a lot. Mine reads 150 rpm high at idle, and the difference is more at higher engine speeds.

Stinnett21 · Oct 18, 2022

Get a VesselView Mobile. Unless it won't work with the reflashed ECM. Maybe the techs will chime in on that issue.

Scott06 · Oct 18, 2022

So other than a likely inaccurate tach and a potential faulty fuel pump relay the boat performs well now correct?

Regal_2250 · Oct 18, 2022

Scott06 said:
not every timing light has a tach feature. If its a modern digital one like an Innova with a tach built in then yes, if its an old school one like mine then no.
talk to your friend if he has a timing light and knows how to use it ( rare skill these days) likely one way or another he has a tach to set idle speed…and can probably walk you through what u need to do…

Just checked with him and he said it does tell you RPM, he should be fairly well versed lol my "friend" is a great guy I met at work who specializes in repair of the German Harbour crane that I operate. He's been helping me through the ECM failure diagnosis as well so he's up on what's been happening. Very suspicious of the tach now after chatting on here. I would be so grateful of this is the problem I don't want to throw money into a prop, and it would be nice for once for this boat to the working to spec. It's a great boat on the water and the hull condition and interior is fairly decent. Will report back

Scott06 · Oct 18, 2022

Regal_2250 said:
Just checked with him and he said it does tell you RPM, he should be fairly well versed lol my "friend" is a great guy I met at work who specializes in repair of the German Harbour crane that I operate. He's been helping me through the ECM failure diagnosis as well so he's up on what's been happening. Very suspicious of the tach now after chatting on here. I would be so grateful of this is the problem I don't want to throw money into a prop, and it would be nice for once for this boat to the working to spec. It's a great boat on the water and the hull condition and interior is fairly decent. Will report back

Buy him some beer and he can walk you through it... while you drink 'his' beer...

In the end as long as the tach is consistent - that any difference between dash tach and timing light tach is the same you can make it work. I think you will find that your 5800 rpm is like 4800 or so.

But other than this and the relay everything else seems ok right?

Regal_2250 · Oct 18, 2022

I just removed the tack and cycled the position switch, I was getting an erratic reading at idle about 1100, now she is idle at 6 even so that's a start. Maybe onto something. Sea trial again. Hopefully headed in the right direction

HELP 2005 5.0 MPI OVER REV

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