cmckenn
Member
- Messages
- 4
- Reaction score
- 4
- Points
- 12
- Boat Make
- Scarab
- Year
- 2017
- Boat Model
- HO Impulse
- Boat Length
- 25
First off, jetboaters.net has been more help and more informative than any dealer I have found in my area. Shout out to @Luc Lafreniere for not only helping me with my last issue but obviously helping many others here.
Took Scarab 255 out Friday, ran all day and miles upriver with zero issues. Loaded the family up Easter Sunday and again, rode miles upriver with zero issues. Fast forward 2 weeks, launched the boat, made it past the No Wake zone, accelerated full speed for about 1 minute no problem. Stopped to make sure everyone was good to go across reservoir, accelerated LOW OIL PRESSURE, back off throttle warning goes away, Throttle Up, back on. Turn the boat off a few minutes, fire it back up, let idle for a minute, throttle up, LOW OIL PRESSURE. Engine sounded fine, no warnings at idle or no wake speed. Stopped, checked oil levels, all good. Fired back up, throttled up, again on and immediately back off when throttling down. At this point (I'm assuming because I tripped the warning multiple times, explained in more details below) Portside engine went into limp mode. We actually spent 6 more hours on the water this day, in Dock Mode creeping along the banks and beaching the boat for a fun filled family day, (minus any tubing or skiing). I did some research and my assumptions from automotive mechanics and I ordered the Candoo as well as a new oil pressure sensor. I have not received the oil pressure sensor yet but I did receive the Candoo so I plugged it in, checked the codes for LOW OIL PRESSURE, CLEARED them, checked all the sensor connections, all seemed ok. Hooked water hose up to starboard engine, let system run through checks, No Codes, No Check Engine Light. Increased RPM to 3500 for about 30 seconds, no warning, no codes, all seemed good. Decided to carry boat out to reservoir. Launched, eased out of no wake zone then throttled up and ran fast for about 1 minute. Stopped, said I think we're good to go, throttled up again and the same symptoms as above. This time I paid a little closer attention. The moment Starboard engine hits 2800(ish) RPMS oil light comes on, back off, warning goes off. This time I did not try it over and over to keep it out of Limp Mode but slowly went to sand bar in No Wake speed, anchored and enjoyed the day. I brought the Candoo and laptop on board and plugged it in before leaving. No Code at all for low oil pressure this time. (assuming because I did not set off the warning enough times like before) Headed back to dock, attempted throttle once, immediately Oil Pressure over 2800 RPM, runs fine all day under if under 2800. Got to dock, powered up on trailer (over 2800) no warning. Got home, hooked hose up, started Starboard engine, slowly raised throttle to 3500 RPM, let it run there for about 30 seconds.... Oddly, no warning, no Low Oil Pressure.
My original thought was oil pressure sensor (that is on the way) but in theory... if the sensor was bad would it not be bad all the time? Why is it only registering a fault above 2800 RPM, but can be driven for hours under that threshold with no problems? Furthermore, why out of the water (twice) does the engine perform above 2800 RPM with no issue. The only thing I was unable to test is both engines running at the same time out of water, but I don't see how one has anything to do with the other since they are completely separate systems. I don't believe at this point I have a "major" or internal problem, but I'm wondering where to start with my process of elimination. I'll change the sensor when it gets here, but given the above out of water test, I'll have to actually launch boat to determine if that is the fix.
Any advice will be greatly appreciated, and I assure everyone that I will follow up with the "Fix/Solution" once figured out.
Took Scarab 255 out Friday, ran all day and miles upriver with zero issues. Loaded the family up Easter Sunday and again, rode miles upriver with zero issues. Fast forward 2 weeks, launched the boat, made it past the No Wake zone, accelerated full speed for about 1 minute no problem. Stopped to make sure everyone was good to go across reservoir, accelerated LOW OIL PRESSURE, back off throttle warning goes away, Throttle Up, back on. Turn the boat off a few minutes, fire it back up, let idle for a minute, throttle up, LOW OIL PRESSURE. Engine sounded fine, no warnings at idle or no wake speed. Stopped, checked oil levels, all good. Fired back up, throttled up, again on and immediately back off when throttling down. At this point (I'm assuming because I tripped the warning multiple times, explained in more details below) Portside engine went into limp mode. We actually spent 6 more hours on the water this day, in Dock Mode creeping along the banks and beaching the boat for a fun filled family day, (minus any tubing or skiing). I did some research and my assumptions from automotive mechanics and I ordered the Candoo as well as a new oil pressure sensor. I have not received the oil pressure sensor yet but I did receive the Candoo so I plugged it in, checked the codes for LOW OIL PRESSURE, CLEARED them, checked all the sensor connections, all seemed ok. Hooked water hose up to starboard engine, let system run through checks, No Codes, No Check Engine Light. Increased RPM to 3500 for about 30 seconds, no warning, no codes, all seemed good. Decided to carry boat out to reservoir. Launched, eased out of no wake zone then throttled up and ran fast for about 1 minute. Stopped, said I think we're good to go, throttled up again and the same symptoms as above. This time I paid a little closer attention. The moment Starboard engine hits 2800(ish) RPMS oil light comes on, back off, warning goes off. This time I did not try it over and over to keep it out of Limp Mode but slowly went to sand bar in No Wake speed, anchored and enjoyed the day. I brought the Candoo and laptop on board and plugged it in before leaving. No Code at all for low oil pressure this time. (assuming because I did not set off the warning enough times like before) Headed back to dock, attempted throttle once, immediately Oil Pressure over 2800 RPM, runs fine all day under if under 2800. Got to dock, powered up on trailer (over 2800) no warning. Got home, hooked hose up, started Starboard engine, slowly raised throttle to 3500 RPM, let it run there for about 30 seconds.... Oddly, no warning, no Low Oil Pressure.
My original thought was oil pressure sensor (that is on the way) but in theory... if the sensor was bad would it not be bad all the time? Why is it only registering a fault above 2800 RPM, but can be driven for hours under that threshold with no problems? Furthermore, why out of the water (twice) does the engine perform above 2800 RPM with no issue. The only thing I was unable to test is both engines running at the same time out of water, but I don't see how one has anything to do with the other since they are completely separate systems. I don't believe at this point I have a "major" or internal problem, but I'm wondering where to start with my process of elimination. I'll change the sensor when it gets here, but given the above out of water test, I'll have to actually launch boat to determine if that is the fix.
Any advice will be greatly appreciated, and I assure everyone that I will follow up with the "Fix/Solution" once figured out.
