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HELPPP!!!!!!

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anthony.chiarelli

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i just rebuilt and replaced almost everything in my 2002 seadoo gtx di. it runs and isles at 1450 rpms out of the water. it revs up perfect and idles back down. when i put it into the water it would run and then cut off. if i try to give it gas it cuts off. i put in a new fuel pump, replaced the rings, new battery, new pistons, etc. when i took it out of the water on the ramp it started right up. i took it home and now it doesn’t want to start. compression is i believe 120 in each cylinder.

thanks anthony
 
All the sensors hooked up properly? I vaguely, really vaguely remember 2 share the same style connector. Could be on the RFI's though I can't quite remember. You probably need the throttle position sensor set up properly. I think (if I remember correctly) you can do it with a digital volt meter and the service manual available here for download for premium members or just use Google. I'm a carbed ski guy, so I don't have to mess with those fancy e-leck-tronics.
 
Did you put an OEM fuel pump in it? One of my skis is a 20002GTXDI just like yours. I had almost the exact same symptoms as yours. I ran it on the hose before taking it out for a ride. Backed into the water started it and would idle but it would not rev up. Bottom line is I took it back home, checked the fuel pressure and I only had 90 psi (it had 104 psi previously). It was an aftermarket pump from “high flow fuel”. I think the model was HFF342 DI. I don’t think I even had two hours of run time on that fuel pump. I took my original OEM fuel pump ran it in a 50-50 mixture of gasoline/toluene for about two hours to let it self clean (recommended by people here on this forum). That took care of my problem. However I only get 104 psi. The manual calls for107+ or -2 PSI. I only get 6500 RPM out of my ski it could be the PSI or some other issues haven’t really worked on that lately. I have much much to learn about these skis as I am fairly new to the sport. But the one thing I do know is being a DI owner you need a way to check your fuel pressure. Make sure to change the two internal fuel filters (which are not in the manual) and the External in-line fuel filter. Good luck .
JIM
 
jimmyluke said:
Did you put an OEM fuel pump in it? One of my skis is a 20002GTXDI just like yours. I had almost the exact same symptoms as yours. I ran it on the hose before taking it out for a ride. Backed into the water started it and would idle but it would not rev up. Bottom line is I took it back home, checked the fuel pressure and I only had 90 psi (it had 104 psi previously). It was an aftermarket pump from “high flow fuel”. I think the model was HFF342 DI. I don’t think I even had two hours of run time on that fuel pump. I took my original OEM fuel pump ran it in a 50-50 mixture of gasoline/toluene for about two hours to let it self clean (recommended by people here on this forum). That took care of my problem. However I only get 104 psi. The manual calls for107+ or -2 PSI. I only get 6500 RPM out of my ski it could be the PSI or some other issues haven’t really worked on that lately. I have much much to learn about these skis as I am fairly new to the sport. But the one thing I do know is being a DI owner you need a way to check your fuel pressure. Make sure to change the two internal fuel filters (which are not in the manual) and the External in-line fuel filter. Good luck .
JIM
Click to expand...



thank you. i gotta check it. it should be 27 psi when you plug in the key and 107 (+-2) running.
 
racerxxx said:
All the sensors hooked up properly? I vaguely, really vaguely remember 2 share the same style connector. Could be on the RFI's though I can't quite remember. You probably need the throttle position sensor set up properly. I think (if I remember correctly) you can do it with a digital volt meter and the service manual available here for download for premium members or just use Google. I'm a carbed ski guy, so I don't have to mess with those fancy e-leck-tronics.
Click to expand...


i have the manual. i had a maint code on the dash and when i went into the book it said tps was bad. the code went away so idk if it’s good or bad. i’ll check that
 
anthony.chiarelli said:
i have the manual. i had a maint code on the dash and when i went into the book it said tps was bad. the code went away so idk if it’s good or bad. i’ll check that
Click to expand...

I’m very surprised it actually gave you the code. To the best of my knowledge if you have a maintenance alarm on your dash and it goes away by pressing the “set” button The way it describes in the manual, it was simply a maintenance reminder. If it does not go away it needs to be checked by the dealer or purchase yourself a “candoo pro”- about $400. If you plan on keeping the ski you probably should bite the bullet and purchase a candoo pro.
 
Are you sure about the 120 PSI? Do you trust your tester?

I am in no way an expert on this subject but I believe you should get around 135 on a DI? I vaguely remember reading that on DIs on this forum (lower compression results).

120 PSI on a non DI would definitely be a problem.

Benji.
 
Yes, 130-140 on a DI ski, at 120 you will have hard starting and poor performance if your gauge is correct.
 
Also, your idle out of water seems low. On a non DI it would have to be 3000 I believe. That would make it stall once on the water.

I had an engine dying on me three years ago and at some point, it would start out of the water but die in the water.

Benji.
 
But the question remains: do you trust your compression tester? Last year, I bought a cheap one that almost made me believe that my engine was going (like 130). When tested with a $200 tester, it was close to 140. Just fine. Turned out it was a spark plug issue...

Benji
 
benjilafouine said:
Are you sure about the 120 PSI? Do you trust your tester?

I am in no way an expert on this subject but I believe you should get around 135 on a DI? I vaguely remember reading that on DIs on this forum (lower compression results).

120 PSI on a non DI would definitely be a problem.

Benji.
Click to expand...

yes i have 2 testers. i only tested it with the one i should test it with the other one
 
benjilafouine said:
Also, your idle out of water seems low. On a non DI it would have to be 3000 I believe. That would make it stall once on the water.

I had an engine dying on me three years ago and at some point, it would start out of the water but die in the water.

Benji.
Click to expand...

that would make a lot of sense because it won’t be able to keep running under the pressure of the water. taking it off the trailer i had it in reverse and when i took it off i was at a higher rpm but when i let it idle it would die.
 
benjilafouine said:
But the question remains: do you trust your compression tester? Last year, I bought a cheap one that almost made me believe that my engine was going (like 130). When tested with a $200 tester, it was close to 140. Just fine. Turned out it was a spark plug issue...

Benji
Click to expand...


what could the spark plug issue be tho. not enough spark or sparks plugs failing out?
 
when i took it out of the water after it wouldn’t idle on the water, it ran fine. i took it home which is like 2 mins away because i love on the water. i got home pulled into my driveway and now it doesn’t want to run at all. i have a spark plug tester and it says that i have spark. i’ll check the compression again. when i put the rings on at first on tested was reading 150 because it was a performance kit. now i have a different one and it’s reading 125. very stumped on this ski!!
 
You really need to check that fuel pressure, then you will know one way or the other ESPECIALLY If you have an aftermarket fuel pump.
 
Where was I... Just didn't think and looked stupid! If you rule out everything else than the engine, then it has to be the engine. Now I just may sound stupid again but DIs have a rotary valve, right?
 
Last edited:
benjilafouine said:
Where was I... Just didn't think and looked stupid! If you rule out everything else than the engine, then it has to be the engine. Now I just ma sound stupid again but DIs have a rotary valve, right?
Click to expand...

I am fairly certain that the DIs do not have a rotary valve. I have no experience with a rotary valve. I just happen to have the engine out of my 2001 gtx DI. Here is a picture of the intake area where the throttle bodies would attach.IMG_6068.JPG
Hope this helps.
 
OK, then I will let someone else help you with your DI! This is way out of my field of expertise! And from the looks of it you're a much better mechanics than me (I'm null).

I was just asking because an incorrect timed engine can be really hard to start, acting like it has no power and won't accelerate correctly (and stall). I had that on my 2003 GTI LE 2003 after a rebuild and it was very frustrating.
 
DI skis idle in and out of the water at 1450rpms. MPEM programmed for this already.
If the fuel pump was replaced with after market then that is your problem. Replace with OEM.
If you replaced the throttle body then the tps will need to be reset.
0 to 80% throttle should read 5/6 volts on the meter. 80 to 100% throttle should read 0 volts. Meter should be connected to black/white wire on throttle body and ground. Checked while ski is not running and lanyard installed.
If you have the original fuel pump then pull it and replace the internal filters.
Airtex FS220 and FS242. Replace the external fuel filter while you are at it.
Hook up a pressure gauge. Pressure should be 107psi. 80psi fuel pressure plus 27psi air pressure totaling 107psi.
All sensors should be connected or it would throw a code. Maint light. No maint light and it is probably fuel related.
And no DI skis do not have a rotary valve.
 
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