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2000 150 ocean pro not turning over 2500 rpms

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dkleggett2

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"engine runs fine under 2500 r

"engine runs fine under 2500 rpms but anything over enige runs terrible . checked for water in fuel,air in lines . any ideas ?"
 
Engine went into limp mode for

Engine went into limp mode for some reason? This mode allows the engine to run well enough to get a boat to safety without causing any damage to the engine.(under 3000 rpm) Could be the computer has received a trouble code setting this limp mode. Have no answers of how to correct this other than take it to the dealer for a computer check.
 
"Sounds like SLOW mode to me.

"Sounds like SLOW mode to me. SLOW is triggered by an overheat condition. Did the horns sound?

Important to know...is this a Johnson or an Evinrude?
Please post model number.

The Evinrude would be computer controlled Ficht, and the Johnson would be good old reliable carb'ed model."
 
"It's a Johnson j150vxsss.

"It's a Johnson j150vxsss. Yes , the alarm did sound due to water temp. Temp went high for about 25 seconds and came down. Then engine started running bad over 2500."
 
"OK, SLOW kicked in just like

"OK, SLOW kicked in just like it should.
First, fix the overheat problem if you haven't already.
The SLOW system will not kick in if the engine is running correct temp. (143 deg thermos). You should be able to put your palm on the heads when at temp, and hold there for a few secs. Just a bit uncomfortable, not searing the skin off, you understand.
Now, if it is "stuck in SLOW," disconnect at the bullet connector on port side top of head the white/black wire. This is the input to the pack that triggers SLOW. Take it for a run and post back. Don't let it overheat!!!"
 
Correction....you have a port

Correction....you have a port temp sensor that is wired into a two pin plug. It is not as I described. It may be possible to see that there is a tan wire as well as a white/black going to that two pin plug. Just pull the two pin plug apart and leave it hanging.
All other suggestions remain the same.
 
"Nope. Key off, and then a re

"Nope. Key off, and then a restart resets it.
Assuming the overheat problem is fixed...
if it is stuck in SLOW, that port temp sensor is probably bad...test by disconnecting as I suggest."
 
I'm not sure if I am unplu

I'm not sure if I am unplugging correct plug ? It's black/white on1 pin and tan on the other . On the other side of the plug it's white/ black on 1 pin and tan/blue on the other . The wires go into a hole in the head between the top and middle cylinder . And there is an identical hole on other side of engine with a tan/ blue wire??
 
"Yes thats it. Apparently the

"Yes thats it. Apparently they relocated them lower down on the head. I am surprised that the wire colors are as you describe. You sure it is not an overall white wire with a black stripe?
I know for sure it is white/black stripe on my 1996 and 1998...they are usually VERY consistent on wiring colors.
There is a similar temp sensor on the starboard side with only one wire.

Just unplug the port sensor and run it to test. You really have to be in the water for this test, not on muffs, as the higher rpms for this test are not safe to run on muffs.

Or, if you have an ohmmeter, check that black/white (or white/black) for continuity to ground. Should not have continuity...should be open to ground."
 
"Checked white/black wire , it

"Checked white/black wire , it is open to ground . Just to the left of the port sensor , is that the sending unit for the gauge . Also what is the sensor on the other side for ?"
 
"OK...both sensors are temp se

"OK...both sensors are temp sensors. Port side has white/black and tan and the starboard has a tan/blue. (Not sure on that color either....should be plain tan on starboard too)
The white/black, when shorted to ground as it normally will do in an overheat condition, will trigger the powerpack to go into SLOW mode.
Both tan wires are overheat circuits that eventually go up to the Systems Check tach thru the harness to signal the tach that an overheat condition has occurred, and to blow the horn.
Yes, the tach blows the horn...

So, when cold the white/black is open to ground.
Good. You now have to run it with that two pin port connector disconnected. It is really best to do this on the lake. Your port temp sender could be kicking in at a much lower temp than designed.

You never said if the overheat was corrected..?? Can you touch the heads for a couple of secs without smelling burning flesh?
If it is still overheating...no wonder the SLOW is kicking in.

I will ask the experts here...if he disconnects the port temp sender, and it is not overheating, and it still goes into SLOW above 2500 rpm...I gotta say it is a bad power pack...could that be?

Or is there something else in the OIS that could also cause this?"
 
""The white/black, when sh

""The white/black, when shorted to ground as it normally will do in an overheat condition, will trigger the powerpack to go into SLOW mode. "

Not quite sure I agree to that.
Port side switch is dual. The white/Black will disconnect the quick start at about 32C. The brown will activate SLOW at overheat as will the brown on port side.
To test quick start: start the engine cold, and it should run at about 1000+ rpm, then drop after a minute or two when quick start is disconnected. You may start it with white black disconnected, then ground the power pack end of the cable and rpm should drop."
 
"I didn't get a chance to

"I didn't get a chance to put the boat in the water today . I should be able to tommorow , and test what we have been discussing . I think my overheating problem was trash in the thermostates ."
 
"Mort is absolutely right.
I

"Mort is absolutely right.
I am mixing up the QuickStart with the SLOW functions on the wire colors.
Very sorry if I have misled you.
Still, make sure it is not stuck in SLOW somehow."
 
"Models with S.L.O.W.
ENGINE

"Models with S.L.O.W.
ENGINE WILL NOT ACCELERATE BEYOND 2500 RPM:
1. Use a temperature probe and verify that the engine is not overheating.
2. Disconnect the tan temperature wire from the pack and retest. If the engine now performs properly, replace the
temperature switch.
3. Make sure the tan temperature switch wire is not located next to a spark plug wire."
 
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