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2004 gtx 4-tec supercharged high idling

evan1342

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Water Crafts
98 sea-doo XP limited
03 sea-doo GTX limited supercharged
#1
I’m having trouble with my gtx supercharged. I’m trying to start it after a long winter. I replaced the battery and Now when I start it the engine will start but idles a little rough. But when I hit the gas, I just tapped it, and the engine revs to full throttle and won’t idle down even when I remove my finger from the gas. I have to completely shut the jet ski down. The only think I put in for the winter was sta-nil in about 1/4 of gas. Anyone have this issue or know of what I might be able to check???
 
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mkov608

Active Member
Messages
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Location
Pensacola, FL
Water Crafts
1995 XP (sold)
1999 GTX Limited (sold)
2X 2002 GTX 4-tec
#2
Tell me about your off-season storage maintenance. What did you do, and what didn't you do?

Take off your seat and watch the throttle linkage, does the linkage on the throttle body snap back to idle when you release the throttle trigger or does it stick?

OBTW, when you store the ski for long periods, the gas tank should be full. With all the air space with a 1/4 tank of gas, moisture in the air (humidity) will condense and settle in the fuel. If you use regular gas with ethanol, water is even more of a problem. Sta-Bil will help, but the tank needs to be full.
 

evan1342

New Member
Messages
9
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Water Crafts
98 sea-doo XP limited
03 sea-doo GTX limited supercharged
#3
Checked the linkage today. It’s springs back just fine. When I start the ski it will idle at 4000rpm for about 5 seconds and then jumps to 6000rpm and then to wide open throttle. I filled the gas tank with fresh gas. I’ll try and run some through tomorrow slowly.
 

mkov608

Active Member
Messages
590
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36
Location
Pensacola, FL
Water Crafts
1995 XP (sold)
1999 GTX Limited (sold)
2X 2002 GTX 4-tec
#4
That is weird for sure! Maybe Skidoo will chime in. I'd suspect the ECU since it controls idle speed, but Skidoo may have other ideas.
 
Messages
8,231
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220
Location
Virginia Sea Level
Water Crafts
2001 Sportster LE 951 Carbed
#5
Good advice on the linkage sticking and partially filled fuel tank.

Doesn't the 4-tec have an idle speed compensator device? I'm not sure about the 4-tec specifically but fogging oil can make them sticky.
 

mkov608

Active Member
Messages
590
Likes
36
Location
Pensacola, FL
Water Crafts
1995 XP (sold)
1999 GTX Limited (sold)
2X 2002 GTX 4-tec
#6
Evan, do you have a Can-Doo scanner? I just remembered you can pull up throttle position on a laptop if you have a Can-Doo. That way you can see if the throttle position sensor input to the ECU is changing value as you operate the throttle.
 

evan1342

New Member
Messages
9
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0
Water Crafts
98 sea-doo XP limited
03 sea-doo GTX limited supercharged
#7
Unfortunately I do not have a can-doo scanner.
 

Jerome3878

New Member
Messages
3
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Water Crafts
2003 SeaDoo gtx-4tec SC
#9
Do you have someone like a close brother in-law? If so just hand it over to him and be done with the issues.
 

Rikky001

Premium Member
Premium Member
Messages
137
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28
Location
South Korea
Water Crafts
Yamaha XLT1200 (past)
Seadoo RXT 260 RS 2010
#10
Tell me about your off-season storage maintenance. What did you do, and what didn't you do?

Take off your seat and watch the throttle linkage, does the linkage on the throttle body snap back to idle when you release the throttle trigger or does it stick?

OBTW, when you store the ski for long periods, the gas tank should be full. With all the air space with a 1/4 tank of gas, moisture in the air (humidity) will condense and settle in the fuel. If you use regular gas with ethanol, water is even more of a problem. Sta-Bil will help, but the tank needs to be full.
If water is a problem, it is with the ethanol in the fuel, don't waste money in filling up the tank. Keep it empty when you store it.
You could keep it full if you had the possibility to drain the water, but it is not on a PWC.
 

evan1342

New Member
Messages
9
Likes
0
Water Crafts
98 sea-doo XP limited
03 sea-doo GTX limited supercharged
#12
Evan, do you have a Can-Doo scanner? I just remembered you can pull up throttle position on a laptop if you have a Can-Doo. That way you can see if the throttle position sensor input to the ECU is changing value as you operate the throttle.
I tried to read the codes by pressing the set button 5 times, but all that comes up is “END”. I’m assuming that means it’s not reading fault codes. If I bought the candoo limited version for $400, do you think it would pull anything that’s wouldn’t be showing up on the sequence code thing I did ???
 

mkov608

Active Member
Messages
590
Likes
36
Location
Pensacola, FL
Water Crafts
1995 XP (sold)
1999 GTX Limited (sold)
2X 2002 GTX 4-tec
#15
Well, that's one you don't see everyday. Keep us posted after you change that manifold.
 

mkov608

Active Member
Messages
590
Likes
36
Location
Pensacola, FL
Water Crafts
1995 XP (sold)
1999 GTX Limited (sold)
2X 2002 GTX 4-tec
#16
If water is a problem, it is with the ethanol in the fuel, don't waste money in filling up the tank. Keep it empty when you store it.
You could keep it full if you had the possibility to drain the water, but it is not on a PWC.
Let's correct the record with information from the Sea-Doo Owner's manual & Sta-Bil.

Here's a clip from the manual.

1562504891323.png

Now read the instructions on the Sta-Bil website:

Sta-Bil.JPG

Always reference your manual when performing maintenance tasks (especially storage maintenance). I've been servicing my 2002 skis since I bought them, and I've never had a fuel system issue.
 
Messages
9
Likes
0
Water Crafts
98 sea-doo XP limited
03 sea-doo GTX limited supercharged
#17
Well, that's one you don't see everyday. Keep us posted after you change that manifold.
I replaced the manifold with one I found on eBay for $40. Bolted on plugged all the sensors back on and it ran like a champ this weekend, but now I have a rock stuck in the impeller from and inexperienced rider starting it to close to shore. Thanks for the fuel storage info. I will def be following them this off season.
 
Messages
8,231
Likes
220
Location
Virginia Sea Level
Water Crafts
2001 Sportster LE 951 Carbed
#18
Good report @evan1342, vacuum leaks deserve mention more often b/c some models it's common.

And yes, for EFI b/c the electric fuel pump in the tank is easily corroded by moisture in air you have to keep the tank full during storage, this means stabilizer will be necessary. I recommend using stabilizer even if you have marina fuel. Put the stabilizer in and chase it with fuel to wash it down into the tank and run the engine last outing to distribute the stabilizer throughout.

If it weren't for the electric fuel pump, I prefer to empty the tank. Keep in mind, some tanks are upwards of 80 gallons and that's one heck of a lot of fuel to dispose of, especially once it sours.
 

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