Hi Everyone. New to the forum and hoping you can help me go to the next step of troubleshooting. I had a 97 Speedster boat years ago. Carbs are easy. The RFI is causing me problems.
2001 Seadoo GTX RFI - 2 stroke
History: Bought used with new engine but not running right.
Issue: RPM limits to 4400 rpm when warm (5-10min into run). Will run at 6840rpm with WOT as long as you stay there. Once you slow down the rpm limit starts.
No diagnostic codes in CAN-DOO. No indicated codes in dash panel diagnostic (beeps and LEDs), No MAINT indicator.
I have read through all the posts in this link.
{forum title /threads/gtx-rfi-2000-wont-get-over-4000-rpm.64074/
[edit - can't post a link yet as new user]
Usual first step is "change the rectifier". Yeah, I have read almost all the threads and here is what I have done thus far. I am usually very good about using search functions and learning from those who have crossed this path before me. Many similar threads do not post a solution if they found one.
Existing troubleshooting:
new 4tec rectifier. Probably money well spent even though this did not change running condition.
Stator wires all measure in spec
Stator output voltage correct
Ski puts out 13.8V to battery while running above about 3K rpm. Goes up slightly at WOT under load on the water. I ran a jumper wire to meter taped to console while driving it.
battery has been load tested good and has a maintenance charger as well as disconnect
Fuel pressure correct.
Fuel screens on pump have been cleaned
new plugs
Plug wires trimmed back at leads
Front and rear fuse panels cleaned
1A and 20A fuses intact
TPS has been replaced (had dead spot in it)
TPS properly zeroed out in CAN-DOO.
Tried spare MPEM and had same issues.
Swapped Bosch ECU within MPEM and had same issues.
CHT sensor measures in spec
Rave valves cleaned and move freely
I am pretty confident this is not a mechanical issue. The ski runs great and will maintain WOT at max revs for as long as you don't slow down. It takes approximately 10-15 min (temperature dependent) before the issue starts up. I have read CanDoo codes before and after and there are none.
The limp mode supposedly will occur for low voltage to ECU. The only thing I have not done is measure voltage at ECU. I think this is Connector 3-P7 (red/purple) wire.
Do the two power wires and ground wires to Connector 3 have crimp issues or other high resistance contacts that would cause a low voltage scenario?
Any other suggestions?
Thanks
Jamie
newbie in Austin, TX
2001 Seadoo GTX RFI - 2 stroke
History: Bought used with new engine but not running right.
Issue: RPM limits to 4400 rpm when warm (5-10min into run). Will run at 6840rpm with WOT as long as you stay there. Once you slow down the rpm limit starts.
No diagnostic codes in CAN-DOO. No indicated codes in dash panel diagnostic (beeps and LEDs), No MAINT indicator.
I have read through all the posts in this link.
{forum title /threads/gtx-rfi-2000-wont-get-over-4000-rpm.64074/
[edit - can't post a link yet as new user]
Usual first step is "change the rectifier". Yeah, I have read almost all the threads and here is what I have done thus far. I am usually very good about using search functions and learning from those who have crossed this path before me. Many similar threads do not post a solution if they found one.
Existing troubleshooting:
new 4tec rectifier. Probably money well spent even though this did not change running condition.
Stator wires all measure in spec
Stator output voltage correct
Ski puts out 13.8V to battery while running above about 3K rpm. Goes up slightly at WOT under load on the water. I ran a jumper wire to meter taped to console while driving it.
battery has been load tested good and has a maintenance charger as well as disconnect
Fuel pressure correct.
Fuel screens on pump have been cleaned
new plugs
Plug wires trimmed back at leads
Front and rear fuse panels cleaned
1A and 20A fuses intact
TPS has been replaced (had dead spot in it)
TPS properly zeroed out in CAN-DOO.
Tried spare MPEM and had same issues.
Swapped Bosch ECU within MPEM and had same issues.
CHT sensor measures in spec
Rave valves cleaned and move freely
I am pretty confident this is not a mechanical issue. The ski runs great and will maintain WOT at max revs for as long as you don't slow down. It takes approximately 10-15 min (temperature dependent) before the issue starts up. I have read CanDoo codes before and after and there are none.
The limp mode supposedly will occur for low voltage to ECU. The only thing I have not done is measure voltage at ECU. I think this is Connector 3-P7 (red/purple) wire.
Do the two power wires and ground wires to Connector 3 have crimp issues or other high resistance contacts that would cause a low voltage scenario?
Any other suggestions?
Thanks
Jamie
newbie in Austin, TX