92 ProV 150 idles fine intermittently won't plane out

[anthonysjo]

Hello,

I have a 91 Champion with a 92 Yamaha ProV 150 and the motor always starts and idles fine. However, there are times when I go to take off and it won't come out of the hole and just boggs (feels like it is trying to go but motor shakes and acts like it is missing real bad). I can usually go back to idle, sometimes shut the motor off, and it will then come out of the hole fine and run good until the next time it decides to do it. This issue does not happen every time I take off and sometimes I have to start over a few times before it will come out of the hole. I have changed the plugs and the gas is fresh.

Any help on narrowing this down for me would be greatly appreciated!


Model P150TLRP
Code 6J9 L
Serial 353659

Thanks,
Anthony

 

[cousinabe]

Re: 92 ProV 150 idles fine intermittently won't plane out

Do you have yamaha gauges; are any alarms/indicators going off? Possibly, the motor is going into reduction mode.

Do you have a service manual?

 

[anthonysjo]

Re: 92 ProV 150 idles fine intermittently won't plane out

Yes I do have the gauges and I only have the Seloc manual which doesn't seem to be as helpful as what a Yamaha service manual would be. I think what I need to do is start from scratch and make sure the gauges and alarms are working correctly then troubleshoot any areas that are not working correctly (i.e. my fuel gauge). When I turn the key on I get indicators initial like I should for oil, temp, fuel, battery, etc but some do not work properly after the key is on for a few seconds. Specifically my battery is always flashing, always has since I bought the boat but it has no battery problems. The fuel gauge always shows empty and it has not worked for as long as I can remember. I have had some issues with the buzzer but I have never been able to nail it down because it always happened when my brother was using my boat, I know bad idea .

I can also pull the kill cord and turn the key to start so I think that tells me the buzzer is working.


Now what I need to do it try to test each function to ensure it is working properly so if something goes off I can isolate it using the gauges and such.

On another note I am pretty sure that the gauge was unhooked at one point and the boat still ran fine. Not sure if it is possible that the alarm picked up a ground or what but the boat still ran fine.

Sorry for the long explanation but thought it might be helpful if I give you some history.

 

[cousinabe]

Re: 92 ProV 150 idles fine intermittently won't plane out

history is a good thing... the only info we have is what you type.

I would look at that battery indicator and try to get that resolved.

I saw a good post regarding rpm reduction mode. this thread deals with a 2002 model, yours is a 1992 and uses the trim position sensor in the oiling system... just another thing to check.

http://forums.iboats.com/showthread.php?t=288110

could be a loose connection or a poor connection at the engine tank, if you unplug,or the oil control module thinks you did, the engine oil tank while the engine is running it sets the buzzer.
that motor does not use trim position for any oil system functions. only engines that used the trim sender for any oiling functions was the 2.6L V6 from 90-95.
you can check the engine tank switch with a multimeter.
float all the way up,continuity between black and white,possibly blue/white. float at midpoint,continuity from brown to black,possibly blue/green to black. float ll the way down continuity from red to black.
you may have to reverse the meter leads as I have no way of knowing which lead is actually positive and negative on your meter and the engine tnk switch has some diodes as a hold circuit.
best I remember a loose battery connection or loss of voltage to the control module can trigger an alarm.

 

[anthonysjo]

Re: 92 ProV 150 idles fine intermittently won't plane out

After looking at that it looks like the battery indicator is a good place to start. Do you know what wires are used, location of wire origination/termination, and the proper testing process?

Thanks for all your help!!

 

[cousinabe]

Re: 92 ProV 150 idles fine intermittently won't plane out

most posts i have read deal with corroded cables. this thread describes a good test. do some research on voltage drop testing.

http://forums.iboats.com/showthread.php?t=236649

post any results and good luck!

another good one
http://www.boatfix.com/how/Ele3.html

 

[anthonysjo]

Re: 92 ProV 150 idles fine intermittently won't plane out

I can go through these tonight but I am guessing that I am fine as I have no starter problems and my gauge does not work properly even if it is on a charger and doesn't matter if the key is on without being started, in the process of cranking over, or running.

Is there a test I can do that will tell me if my gauge is working correctly to start with? i.e test blank colored wire at gauge and tester should give 12 volts. If you do not have 12 volts there check blank conection or wire at a location on on the motor and see if you have 12 volts there.

I would guess that is the fastest way to get this issue fixed....but then again I do not know for sure so that is why I am asking.

thanks for all the help!!

 

[anthonysjo]

Re: 92 ProV 150 idles fine intermittently won't plane out

Good news...I went home and did some more checking and the Battery indicator is working correctly. I am also showing an indicator above the green oil light which is good. My fuel gauge was not working but I finally found that someone had spliced the wire 4 times in a 3 foot section and needless to say one of the wires had pulled loose so it is working now. Then I decided to do some more testing to make sure the other functions were working correctly.

I tested both oil reservoir sensors work correctly and I grounded the temp sensors and they are working correctly.

Here is what I am thinking now?.go ahead and change the temp sensors as they are probably not that expensive, fuel filter, and fuel pump diaphragms. I am also thinking about pulling all three carburetors and rebuilding them to make sure everything is clean and there is nothing plugging flow intermittently.


What do you guys think?

 

[cousinabe]

Re: 92 ProV 150 idles fine intermittently won't plane out

I would also perform an oil transfer test as this can cause an rpm reduction alarm. I believe an alarm would sound and all gauge lights would flash.
clean out the remote oil tank and filter on the back of it.

While you're doing these maint items, you may also want to look at the thermostats, water pump and make sure your popet valve is not blocked up.

Fuel restrictions will not cause the motor to shake and go into rpm reduction mode. It would cause it to bog down or surge.
overheat, oil or battery are the culprits of reduction mode.

BTW, P150TLRP is a 1991.

 

[anthonysjo]

Re: 92 ProV 150 idles fine intermittently won't plane out

Thanks for help cousinabe!!

I am not sure how to test the oil transfer but I can do some more research. Where are the thermostats on this motor? I changed the water pump just a few months ago so I think I am good there.

Should I even mess with the carbs?

OBTW...I typed the wrong year and couldn't figure out how to change it.

 

[cousinabe]

Re: 92 ProV 150 idles fine intermittently won't plane out

oil transfer testing. does your trim position sensor work:
http://forums.iboats.com/showthread.php?t=270390

tstats location. parts #35, you will probably need a new gaskets #37 as well.
http://www.boats.net/parts/search/Yamaha/Outboard/1991/P150TLRP/CYLINDER CRANKCASE/parts.html

 

[anthonysjo]

Re: 92 ProV 150 idles fine intermittently won't plane out

Ok maybe now we are getting somewhere...I determined that my trim gauge was not working...It was before last year but in the process of pulling the engine (power head??) last year so I could change a bracket that holds the shift rod I incorrectly plugged the orange wire to the pink leads headed to the gauge and vice versa.

Could this be my culprit? i.e. would that send my motor into degraded mode intermittently?

 

[cousinabe]

Re: 92 ProV 150 idles fine intermittently won't plane out

a faulty trim sensor would prohibit the auto oil transfer from remote oil tank to engine oil tank from working correctly. This would mean that the oil tank on the engine would not fill.

the engine oil tank should be able to refill from empty in 180 seconds or less.
if it cannot either there is a restriction or low pump voltage.
the engine oil tank switches simply turn the pump on,off or alert the operator to low engine tank level via RPM reduction,audible and visual alarms.
the remote tank switch has 2 functions, one is to alert the operator either there is enough for an automatic transfer or not.
the second, if not, the yellow lamp is lit and automatic transfer is prohibited by the control module in the ECU.on 2.6L V6 motors from 90-95 the trim sender must be below the tilt level or auto transfer is prohibited.

How much oil is in the engine oil tank when you are having these problems?

Fix your trim switch. Clean the remote oil tank filter on the outside hoses of the unit.

 

[anthonysjo]

Re: 92 ProV 150 idles fine intermittently won't plane out

The tank is full and has been from what I have been able to tell. My gauge was reading full trim up before no matter what the position. I have swapped the wires and the gauge is reading correctly now.

I am still not sure if this is what was causing the reduction mode but it sounds like it is possible....

thoughts?

 

[cousinabe]

Re: 92 ProV 150 idles fine intermittently won't plane out

Have you resolved this?

 

[rdnk_4_lf]

Re: 92 ProV 150 idles fine intermittently won't plane out

check your carbs and/or intake.