Early 2003 Seadoo Challenger with 240 Merc Jet Drive Wont Rev

[bluewaterboy]

Hi everyone...

I've just inherited an early 2003 Seadoo Challenger with the Mercury 240 EFI jet drive. It drove the previous owner nuts.

The problem is that it starts and idles, but giving it any more than a bit of throttle kills the engine. The ECM has supposedly been repaired numerous times and the mechanic who does not want to work on it any longer says it still needs an ECM.

I've just had a look at the engine compartment and have noticed two wires have been cut near from one of the terminal connectors. The connector is near the ECM but does I can't tell where the other end of wires would go.

Are these machines known for ECM problems? Any ideas as to what is really wrong with this boat?

Big thanks,
bluewaterboy

 

[WAJetboating]

The ECM has supposedly been repaired numerous times and the mechanic who does not want to work on it any longer says it still needs an ECM.

The ECM's on these engines are not "repaired". They are "replaced". They are not intended to be serviced. I'm not sure what is meant by "repaired" in this context.

I've just had a look at the engine compartment and have noticed two wires have been cut near from one of the terminal connectors. The connector is near the ECM but does I can't tell where the other end of wires would go.

There are a lot of sensors and a lot of wires on this engine. We need a LOT more info to be helpful. Photos would be a great idea.

Disconnecting/cutting wires in certain places can definitely have a huge effect on proper operation. Let's hope it's that simple.

Are these machines known for ECM problems?

No.

Any ideas as to what is really wrong with this boat?

Not without more info, particularly photos.