Engine won’t start when hot

[FSH 210 Sport]

Had a Scarab. Sold it and have had the 242x for 3 years. I usually cruise into the no wake zone in no wake mode where we tie off or anchor out and that never makes a difference. The boat is firing. It will try to start, but sputter and fail. Sometimes you have to crank it numerous times before it will finally keep running. This is definitely temperature related. I don't see how the pickup coil could be out of spec when it starts first crank every time cold, and also every time hot after it finally starts.

Because the Ohm value of the winding in the pick up coil is changing due to heat, crank position sensors do the same on their way to failure. Having said that, even when cold a bad pick up coil will be out of range when cold. You’ll need a shop manual and a good ohm meter to test the pick up coil, check it cold then check it if the engine doesn’t want to start. The symptoms you describe of how it is getting worse are a bit classic for a failing pick up coil from what I’ve read here. Check it and eliminate it as a possible cause.

Try the no wake mode at level three in neutral for 15 seconds then back to idle then shutdown once you’ve stopped just to be sure.

 

[Jet Boat Brant]

Because the Ohm value of the winding in the pick up coil is changing due to heat, crank position sensors do the same on their way to failure. Having said that, even when cold a bad pick up coil will be out of range when cold. You’ll need a shop manual and a good ohm meter to test the pick up coil, check it cold then check it if the engine doesn’t want to start. The symptoms you describe of how it is getting worse are a bit classic for a failing pick up coil from what I’ve read here. Check it and eliminate it as a possible cause.

Try the no wake mode at level three in neutral for 15 seconds then back to idle then shutdown once you’ve stopped just to be sure.

Ok I'll give it a shot. I honestly think that if I never start the boat, just turn the key on and let it sit for 3 hours in float mode it will have the same problem, but I haven't tested that theory. In my mind after getting it to start, then immediately shutting it off it should be hard to start again because the temperature is still there, but it starts right up with zero hesitation. It is the weirdest thing.

 

[FSH 210 Sport]

Ok I'll give it a shot. I honestly think that if I never start the boat, just turn the key on and let it sit for 3 hours in float mode it will have the same problem, but I haven't tested that theory. In my mind after getting it to start, then immediately shutting it off it should be hard to start again because the temperature is still there, but it starts right up with zero hesitation. It is the weirdest thing.

Keep at it I know you can solve the riddle !

 

[David Martin]

How does the starter sound and sorry if this has been ask I did not re-read all five pages. I had a starter get heat soak once drove me crazy started easy cold and then hot would turn over slow............... then shut it off and then a quick restart hot it was all over the map.

 

[Julian]

Do you run it with the blower on? Some boats have leaks in the exhaust that once you run it for a while starves the engine of air. Also, some people have accidently blocked the air intakes either just with "stuff" or by actually intalling speakers into the holes. I didn't read all the pages on the thread, so maybe you've already eliminated this as a possibility.

 

[suke]

When I've run into these issues I have found leaving the engine hatch open even for 5 minutes is enough to cool everything down to fire right up.

 

[Jet Boat Brant]

How does the starter sound and sorry if this has been ask I did not re-read all five pages. I had a starter get heat soak once drove me crazy started easy cold and then hot would turn over slow............... then shut it off and then a quick restart hot it was all over the map.

Mine cranks super fast, and tries to start so it's firing.. It just takes multiple tries to get it to start.. I'm going to try the blowers, and opening the hatch to see if it helps.