Connected a loose clable and now when reving the engine boat does not go

[JP_R]

hello,

here is my problem. when I changed the oil pressure sensor I found a disconected cable right next to it. I connected it and engine started fine no problems. When I dropped the boat in the water, boat was doing ok until I got to the no wake zone. I tried to speed up and the rpms increased but the boat would not go any faster. I turned off the engine, disconnected the cable, turned the engine back on and everything was fine again.

Actual problem....

yesterday I was changing a switch and I noticed the previous owner had disconnected the dash alarm. I connected it and I got 2 beeps when I switched the ignition and 2 beeps thereafter every minute. So I read two beeps was a sensor and I remembered that cable I had connected and disconnected again due to that problem I had that day. I connected the cable again and the alarm does not sound anymore.

I am now afraid that when I throw the boat in the water again it will give me the same problem of engine reving but not moving any faster than idle speed

Any ideas what that could be.

5.0 mpi alpha one drive.

thanks,

 

[WizeOne]

Re: Connected a loose clable and now when reving the engine boat does not go

Stop! Collect your thoughts and start over again.

What kind of cable? Electrical or mechanical. What/where did you connect it to? You tried to speed up when you got to the 'no wake zone'?

Besides all that, the only way the engine could speed up without a corresponding increase in boat speed (when the OD is confirmed in gear) is if the prop hub or coupler is slipping or maybe you snagged a hunk of seaweed.

 

[JP_R]

Re: Connected a loose clable and now when reving the engine boat does not go

Stop! Collect your thoughts and start over again.

What kind of cable? Electrical or mechanical. What/where did you connect it to? You tried to speed up when you got to the 'no wake zone'?

Besides all that, the only way the engine could speed up without a corresponding increase in boat speed (when the OD is confirmed in gear) is if the prop hub or coupler is slipping or maybe you snagged a hunk of seaweed.

sorry. I am at work right now so I had to be quick.

I connected an electrical cable located right besides the the oil pressure sender. It looks like the female plug goes directly to the block.

I tried to speed up as I was leaving the no wake zone and the boat would not go any faster but engine would rev up fine. I dosconnected the cable again and everything worked normally.

Now the problem I have is that since I have connected the dash alarm it will beep twice if that cable is disconnected.

any thoughts?

 

[Maclin]

Re: Connected a loose clable and now when reving the engine boat does not go

methinks we need some pics...

 

[JP_R]

Re: Connected a loose clable and now when reving the engine boat does not go

I'll get some pictures tonight and post them up.

 

[Bondo]

Re: Connected a loose clable and now when reving the engine boat does not go

I tried to speed up as I was leaving the no wake zone and the boat would not go any faster but engine would rev up fine. I dosconnected the cable again and everything worked normally.

Ayuh,.... You had a prop Full of Weeds,+ they fell off when you were messing with the wire....

 

[JP_R]

Re: Connected a loose clable and now when reving the engine boat does not go (pics)

Re: Connected a loose clable and now when reving the engine boat does not go (pics)

Ok, here are the pictures of the cable I was talking about. It looks like it has something to do with the oil sender unit.

thanks

 

[Maclin]

Re: Connected a loose clable and now when reving the engine boat does not go

Looks like an oil pressure switch, hard to believe it can be left unplugged like that without causing another problem (but not the zero-thrust condition). As Bond-o and Wizeone are suggesting, in all probability the two conditions are not related.

I would wonder more about exactly why the previous owner unhooked the alarm, that is like putting on a blindfold because the beach is approaching.

I would not be afraid at all to leave it plugged in and try going out again.

 

[JP_R]

Re: Connected a loose clable and now when reving the engine boat does not go

I was thinkig the same thing. I dont think the 2 problems are related. I finall replaced the starter tonight and the boat fired right up. I still have the alarm with or without the cable connected.

I am going to have to go to a marina to get it hooked up to the computer.

$90 buck an hour I wish I did not have to spend

 

[WizeOne]

Re: Connected a loose clable and now when reving the engine boat does not go

Whew!

 

[Maclin]

Re: Connected a loose clable and now when reving the engine boat does not go

If you have the separate drive oil reservoir then there is a low drive oil sensor/alarm for that too I believe.

This (all the alarms and bells and whistles) should be explained in the operator's manual from Merc (available in the sticky's section at the front of the forum)

 

[JP_R]

Re: Connected a loose clable and now when reving the engine boat does not go (update)

Re: Connected a loose clable and now when reving the engine boat does not go (update)

Ok guys, I finally had time to replace the IAC and alarm still went off. I decided to conect the cable I was talking about in previous post (pics) and alarm stopped and idled fine. I even reved the engine with muffs on and everything perfect no alarms.

I looked at the oil pressure gauge and needle started to bounce like crazy and slow came to a steady 40 psi. At this point I was happy thinking all problems solved.

I took the boat out on saturday and started fine at idle. NO alarms... After I back out and put the boat in forward boat was running fine until I decided to give it a little gas. At this point solid alarm went off and engine started like to try to shut down until I neutraled the boat. I tried again to rev it a bit and again solid alarm went of. I decided to disconnect the cable from the engine and also power to alarm so it did not keep going off every 2 minutes.

Took a trip (4100 rpms) to elliot key in Miami back and forth and absolutely no problems. My guess is maybe a bad sensor or maybe have to reset computer????

What do you guys think?? I really do not want to spend $90 an hour if I can maybe fix it on my own.

 

[Bt Doctur]

Re: Connected a loose clable and now when reving the engine boat does not go

I`m guessing it`s the fuel pump pressure switch / no oil alarm. Hard to see if it`s a 2 or 3 wire plug.Screwed into the oil gallery plumbing with the oil pressure sender..

 

[Knightgang]

Re: Connected a loose clable and now when reving the engine boat does not go

Sounds like whatever that sensor is it is bad and needs to be replaced...

 

[JP_R]

Re: Connected a loose clable and now when reving the engine boat does not go

I`m guessing it`s the fuel pump pressure switch / no oil alarm. Hard to see if it`s a 2 or 3 wire plug.Screwed into the oil gallery plumbing with the oil pressure sender..

If I remember correctly it is a 3 wire plug. Now what sounds weird is you said "fuel" did you mean oil or fuel. I cannot imagine a fuel pressure switch being connected to an oil piping.

 

[Knightgang]

Re: Connected a loose clable and now when reving the engine boat does not go

Is that an oil injected motor, or do you mix fuel. If it is oil injected, that could be (maybe) an oil flow or oil pressure sensor. If could be bad, thus shutting down the motor thinking it is protecting it from damage. Just a thought...

 

[JP_R]

Re: Connected a loose clable and now when reving the engine boat does not go

Is that an oil injected motor, or do you mix fuel. If it is oil injected, that could be (maybe) an oil flow or oil pressure sensor. If could be bad, thus shutting down the motor thinking it is protecting it from damage. Just a thought...

It is an oil injected engine. I guess I am buying that sensor and see what happens.

$100 bucks more...... Boats just never stop asking for more money haha.

 

[Knightgang]

Re: Connected a loose clable and now when reving the engine boat does not go

B.O.A.T

Break
Out
Another
Thousand

 

[JP_R]

Re: Connected a loose clable and now when reving the engine boat does not go

B.O.A.T

Break
Out
Another
Thousand

hahahaha awesome. Good one!!!!!

 

[Maclin]

Re: Connected a loose clable and now when reving the engine boat does not go

Is that an oil injected motor, or do you mix fuel. If it is oil injected, that could be (maybe) an oil flow or oil pressure sensor. If could be bad, thus shutting down the motor thinking it is protecting it from damage. Just a thought...

He posted earlier that it is a MerCruiser 5.0 which I am pretty sure is a 4 cycle 305 cubic inch V8 engine, no oil injection and no need to mix oil in with the fuel.