1992 Seadoo SP

[Lurp09]

The engine will just cut out after 25 seconds of running. Doesn't matter hot or cold, wide open or idle. It just shuts off. All I have to do is just press the starter button and it starts running again any throttle setting like it never shut off. But in another 25 seconds +/- 1 second it shuts off again and this repeats itself. I am thinking it is the safety switch messing up but I just wanted to see if anyone here has seen this before. It idles perfect and accelerates perfect and it runs at wide open for the 25 seconds. New gas , old gas doesn't change it. New plugs are in it.

Thanks for any response.

 

[Minnetonka4me]

If you have timed it over and over...it happens in the water or out...I believe there is something failing in the MPEM If it was something else it would not be a consistent 25 sec every time.

The 92s had a really crappy MPEM in it they quickly updated...I wonder if one of the relays, which is the crappy part the changed, is the failing part. Ive got a set availabile if you wanna try it before buying an MPEM.

the 93-94 580 MPEMs are a much better choice and will swap right in if you end up replacing it. Im out of them but my bro has a couple.

 

[RodInEscondido]

agree with above if very abrupt cut out

If it starves out, even if very quickly, I would lean toward fuel system. Gray fuel lines? Fuel filter. fuel pump. fuel selector. Even stopping for a short period will allow enough fuel in the system to run for another short period.

I have seen this "starve out" where fuel tanks are not vented properly.

Rod

 

[Bills86e]

I agree with Nick, that relay is most likely cause. Any break or spike into an mpem will shut off the internal timer.

Bills86e

 

[Lurp09]

Thanks for your input guys, It was the MPEM as the culprit, ordered a new one installed and runs like a sewing machine!

Thanks again.