gtx 4-tec SC overheating

[AlexS]

I have a new 2004 4tec SC with about 6 hours on it. I have been gingerly breaking it in with not speeds to speak of over 40. I began pushing it a little bit harder and it is overheating. I have tried flusing the exhaust cooling system as described in the manual but it did nothing.
When flushing I noticed some water coming out of the large port on the right that appears to be for the exhaust. I guess this is normal but wondered.
No choice but to bring it to the dealer and hope they fix it. Does anyone have any ideas what may be the problem or how to go about figuring it out.
Thanks

[AlexS]

I reread my post and did not want any confusion. I said when I back flushed nothing happened. It did appear to flush normally but some water was coming out of the large exhaust port which I questioned but very well could be normal.
I am on vacation and hoped to be able to figure something out so I can still use it.

[Phil STX15F]

The water coming out of the exhaust is normal.It sounds like you will need to bring it to the dealer.Just make sure that there is nothing in the jet pump intake.

[dresf]

I have a 2003 gtx sc which is doing the same thing but also noted a distinct lack of get up and go as well, it is currently at the shop, they are stumped. Keep us posted on what you find out!

[London Ontario Boater]

What is the maximum RPM on the 2004 4-tec SC ?.

Cooling, If it's the same as Non-SC 4 tec's the engine cooling system is closed loop and the exhaust is open loop (water coming from side is the exhaust portion), Engine cooling has fluid going from expansion tank to a thermostat/pump housing, from housing to ride plate and returns from ride plate to front of housing and has a separate line to oil cooler the then back up to expansion tank. thermostat opens at 188F and temperature sensor activates at 212F

There's not much to it, so check your coolant fluid level and you could measure the fluid temp and see if it's close to boiling, that will give you an idea if it's actually overheating or not.

the sensor on my boat sits close to the expansion tank.

Don't know if SC's have a closed loop, but this may help.

It's brand new, I'm sure the dealer will love a visit and get some bombardier $$ to check for blockage,electronics or mixture.

-Gab

[Bill O'Neal2]

Wouldn't a bad temp sensor tell the ignition computer to go into "limp" mode and limited rpm and power output?

To test the resistance of the water tempature sensor (WTS), Remove the plug connector and check the resistance of the sensor itself. It should be between 2280 and 2740 ohms. If otherwise replace the WTS. If resistance test good, reconnect the WTS plug and remove the AMP connector #4 from the mpem and test using a multimeter the resistance between terminal #9 and #11. It should be between 2280 ohms and 2740 ohms. If it isn't, replace the MPEM.

If resistance is still not correct, repair the wiring harness or plugs between the WTS and the MPEM.

To get to the WTS, you must remove the fuel rail.