04 GTX SC - Last issue to solve: A-TEMP warning when running WOT

[brobertov8]

Hi Folks,

After a wide service maintenance only left one issue on my ski.

When it is running WOT for a while (maybe after 1 or 2 minutes), I get a "A-TEMP" warning.
I got it 4 times in the last test...
No error codes were stored... even pressing SET 5 times or reading with CANDOO.... no error et all.
I could "touch" the JPipe almost no problem in these 4 errors times... it was not overheating for sure.


I only could see an "over temp" on the exhaust sensor - not a faulty, just the sensor records max and min, on the software -, according to CANDOO.... So I believe my Exhaust Temperature Sensor is bad.
Am I right?


I also checked the J-PIPE and cheked that 3 roles there... all three looks ok.
And I dont know if the clamp which locks the JPIPE to the waterbox, is ok. So I sent the picture below, maybe someone could tell if it is ok.




Thank You for any help!

 

[pwgsx]

Hard to tell from that pic but maybe the upper clamp is too low squeezing the rubber connector in the center which is restricting flow of the 3 holes?? Also that black rubber connector looks melted from the pic.....

Also I see you added a water shut-off valve- maybe it is too restrictive in the center of the valve??

 

[brobertov8]

Hard to tell from that pic but maybe the upper clamp is too low squeezing the rubber connector in the center which is restricting flow of the 3 holes?? Also that black rubber connector looks melted from the pic.....

Also I see you added a water shut-off valve- maybe it is too restrictive in the center of the valve??

I believe you are right about the valve! The Previous Owner did that, and I did not like it!
I was thinking also that valve was too restructive... I will try to avoid that and test.

And that black rubber is melted yes!! Because I forgot to open that valve once time (argghh), and then the JPipe has been overheated and melted that rubber.

 

[pwgsx]

The valve is ok to use and many do BUT they usually use a larger plastic type that has a larger opening in the valve. Also if you ever turn it off, take your DESS key and tie it around on it, that way when you go to re-start the ski and remember to turn the valve back on.
If it was over heated before then maybe the sensor in the waterbox is bad, might need to replace it as well.

 

[brobertov8]

I removed that valve today and installed a new hose.

I took the oportunity to test the EGTS (exhaust temp sensor) and at normal temperature (+/- 20o celsius) it reads 2500 ohms.... sounds ok according the manual.
But I put it on the water and before boiling, (30 seconds before) it was reading 260ohms.... when the water was real boiling, it reads 210 and was falling..... Is that correct?

I read in an old thread response by [MENTION=16262]ski-d00[/MENTION], which should reads 260ohms at boiling:

"The temp sensor (EGT) just changes the resistance at different temp levels. At room temp, it should be around 2500 ohms. you can put it in hot water to measure the resistance output. At boiling, 212 F, the resistance is around 160 ohms, and this is where the alarm is triggered. "

is my sensor ok or not, due this little difference?

Thank You!

 

[pwgsx]

Not sure man, did you still get the temp warning still at wot? Try the ski on the water. If it still happens replace the sensor.

 

[brobertov8]

Not sure man, did you still get the temp warning still at wot? Try the ski on the water. If it still happens replace the sensor.

thanks, I will do that. today is raining a lot here, hope to test it tomorrow.

 

[brobertov8]

[MENTION=66596]pwgsx[/MENTION]

I forgot to tell you, I´ve found a medium/large piece of metal inside the water box.
Almost the size of the tube, it was hard to remove.



Could it be a restriction for the water flow and maybe, was the reason of that warning?

Thanks

 

[brobertov8]

Just to help someone, since it was one of my questions and I´ve see a lot of people asking the same, I removed this text below from the service manual:



In resume: Don´t expect any error codes when you got an issue coming from EGTX (Exhaust Temperature Sensor) and CTS (Coolant Temperature Sensor).
They don´t feed the ECM, they are just for engine safety purpose and once the warning goes away, you wont see any error code stored.

 

[brobertov8]

Not sure man, did you still get the temp warning still at wot? Try the ski on the water. If it still happens replace the sensor.

I went to test it today, and same problem. Acctually looks like this time I got "A-TEMP" warning sooner than before, but not sure.

I believe the sensor is bad...

Using candoo exhaust max temp hit 140celsius.... others temperatures and pressures looks ok!

I will buy a new one.

 

[pwgsx]

Yea try a new sensor and that metal piece is a baffle inside the waterbox. I have heard that they break loose sometimes. Lucky you could grab it out thru the hole.

 

[brobertov8]

Yea try a new sensor and that metal piece is a baffle inside the waterbox. I have heard that they break loose sometimes. Lucky you could grab it out thru the hole.

[MENTION=66596]pwgsx[/MENTION] thanks for all help provided!

I replace it but the issues continues. Then I realize there was something wrong on the waterbox. I removed it again and there was another large piece of bafle there, blocking the exit exhaust tube. It was hard but I could remove it.

Went to test it today and ski now is really perfect: No leaks, no failures, no warning light and hits 64mph.

Probably this waterbox failure came since previous owner, because on my first ride on this ski I got the same A-TEMP alarm.... and probably no one realize which could be the exhaust system it self.

Thanks and one more issue solved on this forum!