Im not sure if I have posted this before. I have a 115hp yam four stroke. When I crank the motor up about 30 seconds goes by and I can hear the motor drop idle down and the oil alarm will go off. I have to cut it off and recrank several times. I even have to let it run idle higher until the motor warms up. I am hoping someone can tell me where to start looking.
First place to start with an electronically controlled engine is to connect to the service tool and read codes. It could be a bad sensor out of range high or low. If the sensor is suspected to be good then it is a matter of reading oil pressure compared to what is expected and working your way through the troubleshooting trees.
Iain Pelto
Sea Hunt Triton 160 w/ 90 ETEC “JB3”
Native Manta Ray 14
trying to get an oil alarm to stop on it on own, isn’t really a good plan.
if the oil alarm is sounding, it means you have less than 1 psi of oil pressure
I repeat, ONE PSI OF OIL PRESSURE.
It is good to hear from the Wizard of CM.
Chris so the i have started looking is oil leaks, sensors, and oil pump. You have any other ideas
So we took the oil sensor off and put a gauge to test the pressure. The pressure was good on the gauge. That leads me to believe the sensor is or has gone bad.
did you take that reading while the alarm was sounding?
if so its a bad sensor
if not, you have to make sure the oil pressure isn’t coming and going, and you happened to check it on a good day
So today we took the sensor off and cleaned it, put it back on and the first time it did not sound. This morning we cranked it again and the sensor sounded. The question now is there a way to test the sensor it self to see if its bad or am I to assume since it sounded again after being cleaned that is gone bad. My next step I guess is to buy a new sensor and put it on the boat, but I hate to do this and the sensor not be the issue. Anybody have another idea
If the sensor is a screw in you may be able to get the fittings
at hardware store and mount a analog gauge in parallel. If analog
gauge reads low when sensor is sounding ,TROUBLE, Look for reason for low oil pressure. If analog is reading good pressure and sensor is still sounding my guess is BAD SENSOR. Not sure but it’s my opinion!!! Hope this helps.
PS! I would not run much until it’s FIXED…
GW
all gave some , some gave all–only two offered to die for you, christ for your sins , the soldier for your freedom!!!
use mechanical gauge and test the oil pressure while the alarm is sounding
if you have good oil pressure, then you have a bad sensor
So the problem continues. Now my next step I was told to have the sensor in place and crank it up. While the alarm is sounding I should undo the ground wire, which I did. The alarm continued to sound, which to means that the sensor has grounded its self which is not good. Am I understanding this correctly and if so to me the sensor is bad. Who has something to offer on this idea.
quote:
Originally posted by Knot Stressed Charters llSo the problem continues. Now my next step I was told to have the sensor in place and crank it up. While the alarm is sounding I should undo the ground wire, which I did. The alarm continued to sound, which to means that the sensor has grounded its self which is not good. Am I understanding this correctly and if so to me the sensor is bad. Who has something to offer on this idea.
I do but I know severe criticism would surely follow me for the rest of my days.
Take it to a mechanic and have them fix it. It’s a part of owning a boat. Since you run charters your boat makes you money so it needs to be done. Not everyone has that luxury of their boat actually generating income.
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Thanks for the advised Fritz. Now that we have that behind us does anyone actually have any advise that would help me in my quest of being a boat owner and wanting to learn how to fix my own problem before I throw the towel in and take it to a mechanic.
I would advise you to seek more advice from the hull truth.
Charleston City Papers Best Guide of 2014
In all seriousness, sounds like you have a bad sensor. I wouldn’t suggest this to others but what we did was just make it obsolete. Suppsoedly if there is ever a real problem, the motor will shut off. Does your boat ever not want to start? And I fully understand wanting to fix your own stuff and do a lot myself. If you really want to learn how to fix your outboard then I would advise you looking into a class that has actual teachers instead of seeking advice from the internet.
Charleston City Papers Best Guide of 2014
15 days
How many wires connect to sensor??? If ground wire is only one connected to sensor and oil pressure alarm still sounds after disconnecting ground wire , I would look for a ground in wiring
between sensor and alarm !!!
gw
all gave some , some gave all–only two offered to die for you, christ for your sins , the soldier for your freedom!!!
Personally as a Yamaha master technician and owner of a Yamaha certified repair shop, I believe I previously told you how to diagnose the problem twice.
if you would like to test the sensor, purchase a Yamaha factory service manual for your specific motor, and all of the test procedures are described in the manual, but it sounds like you have an intermittent problem, so the test may be inconclusive. the true test, for a 3rd time… hook up a mechanical oil pressure gauge along with the pressure sensor, and if the alarm sounds and you have good oil pressure, its the sensor or related wiring. you may need to make a trip to lowes to make a “t” so you can hook them up together