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Kbhaw11

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Reply with quote  #1 
I have a 2008 (or 2009) 250 etec, 400 hours, that occasionally sets a "hot" light and goes into limp mode for about 15 or 30 seconds. It has happened 3 times starting December 2018. The boat is stored December to April. It then goes off and the engine runs perfectly. Each time it has happened it was at lower RPM, 2000 - 2500. The water pump was replaced 2 years ago at 300 hours, thermostats replaced this winter, EMM hoses checked, etc. It does not lose water pressure. The printout shows it ran at 194 - 212 degrees for a total of 107 seconds, each bank. The EMM did not overheat. I flush the motor after each use and service it annually. Model number is E250DPXSEB serial number 5243756. It set fault code 43. Any thoughts? 
olypopper

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Reply with quote  #2 
That range of RPM is where the engine will run the warmest as it is too low for full prv opening.  If you continue to have the problem, have water pressure tested per the factory service manual.  You could also change the prv spring with an earlier model (7 pound spring vs 9 pound).  
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Gotsea

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Reply with quote  #3 
Oly, , reading your reply something comes  to mind, "You could also change the prv spring with an earlier model (7 pound spring vs 9 pound)" as the op I had several instances where the temperature started to go  up (alarm never went of because I saw it on the MFD) and brought it to idle till it went down again and the water pressure was precisely at 10 psi while  trolling, I will change to a 7 pounds spring, what is the PN for the 7 pounds?
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1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
Kbhaw11

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Reply with quote  #4 
To continue this, I replaced the PRV today. Apparently there was an expired recall on the 2009 250 PVR which included mine for leakage and possible low RPM not closing properly internally. The old PVR looked brand new inside. I was hoping to find a crack or possible crude but didn't. Took the boat out, same thing. The engine water pressure is well within Evinrude specs, the pump is 80 hours old, two years. I did not change the spring in the PVR to a 7 pound spring yet. Another thing I saw was larger intake grills, any thoughts. Today I ran the RPM up with the motor in "neutral" but that didn't make the light go off. I shut the motor off and immediately restarted it. No light and it was fine for the rest of the time, which is what it always does. The hot light comes on around 10 minutes after start up and running through a no wake zone around the same distance from the marina each time. Any more thoughts. I am a car dealer and shutting the motor off and restarting makes me wonder if there is not a false code being set? Same as check engine lights on cars sometimes.
Gotsea

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Reply with quote  #5 
It will be interesting to see what is really setting off the alarm the heads or the EMM, I thought on getting a high volume grill intake too, but it has not happen to me any more, so I have hold of on it   it, I need to add thought I have not troll any more so I can say if the problem is cure or not 
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1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
steelhead

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Reply with quote  #6 
kbhaw stated in opening post that he checked for any EMM overheats or EMM overheat codes.

Simplistic System Watch gauge can not differentiate between motor head overheats or EMM overheats.

The Engine Report should show which head is overheating causing a code and alarm.  Stored error codes are different for SB and Port head temp sensors

Max load on engine when boat is still at max hull displacement speed just before raising up on plane.  Trim tabs take strain off motor and help the hull jump to plane speed.  Also motor height is critical, too low on transom like dragging a 12" well casing through the water
Stern lifting prop can also help reduce engine load at max hull displacement speed.
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