07 AR230 Oil light ---> ECU?

[Blazin14]

All,

So my port engine oil light comes on randomly, then port engine goes into limp mode, then I stop, shut down engine and fire back up and everything fine. Happens 1 time per trip on average. It happens at speed and during idle or during no-wake mode. I put a pressure gauge on the engine and have pressure. More details., brand new engine, with new rebuild oil pump, same issue happened on previous engine too.

My question is, has anybody else had this problem? My next step is to swap the ECUs to see if the problem follows the ECU.

 

[Brad_Ct]

By brand new engine I’m going to guess it is rebuilt, if true who rebuilt it? I along with a couple other people have had oil pressure issues with engine from SBT. What is the gauge showing you have for oil pressure?

 

[buckbuck]

It is a common issue for my boat with the MR-1 engines to have "low" oil pressure at idle. I think it is inherant with all of them. However, I have never experienced the light and going into limp mode. Are you running 10w-40 oil?

 

[Blazin14]

All great questions

1) pressure at 30 -35 mph is at 40 psi which is good. and light will come on at times.... not all the time / randomly.
2) At idle, yes the oil PSI is low, but I think its engorged at idle via ECU..... that why its strange to come on during this time. Mostly when I first fire it up.
3) My new engine is a SBT and that's when it started, I started using 10w-40 and it reduced the frequency. previous engine was SBT - same issue.
4) My factory Starboard engine never had the oil light and always used 10w-30.

 

[Brad_Ct]

All great questions

1) pressure at 30 -35 mph is at 40 psi which is good. and light will come on at times.... not all the time / randomly.
2) At idle, yes the oil PSI is low, but I think its engorged at idle via ECU..... that why its strange to come on during this time. Mostly when I first fire it up.
3) My new engine is a SBT and that's when it started, I started using 10w-40 and it reduced the frequency. previous engine was SBT - same issue.
4) My factory Starboard engine never had the oil light and always used 10w-30.

I’m going to go out on a limb here with no proof and blame the low pressure on the way SBT rebuilds their engines. I know of at least one other person beside the two of us that has had oil pressure problems with their engines.

Do you know what happened to the SBT engine you replaced?

I have a spare oil pressure switch around somewhere and over the weekend I’m going to test it to see at what pressures it opens and closes.

 

[Blazin14]

Brad,

My previous SBT engine had crack in the casting and random oil engine light coming on too. SBT was very helpful but cost me a lot of extra labor on my part. I replaced the oil pressure sensor when the engine was replaced, but also have an analog gauge too to confirm pressure.

Swapping my ECU will tell all.......

I should have an update in 2-3 weeks.