I have a 2002 GTX RFI that was running great then died instantly while running at about 30 mph. After towing it to shore, it would not restart. After a few days of sitting, it would start for 5 seconds then die. I have a copy of the official Sea Doo service manual and have conducted every diagnostic test I can find. Here is what I have found so far:
1. Getting good compression (155 psi/cylinder).
2. Good fuel flow (observed good fuel spray from the injectors while cranking after removing the fuel rail from the engine).
3. Hot spark (getting a hot 1/2 inch spark from each wire to the top of each plug during cranking)
4. Fuel pressure is showing 56 psi during cranking.
5. Measured 6 volts at each injector.
6. Checked resistances on all sensors and found them all to be within specs.
7. Battery is new. Voltage is above 12 volts.
8. Spark plugs are new and clean.
9. Checked all fuses at MPEM and rear electrical box. All are good.
The problem happened a couple months ago. Again, the engine was running great when it died suddenly (like someone turned off the key switch). After sitting for a couple days, the engine will run for about 5 seconds on the first crank. After that, it will not run at all on the second, third and fourth cranks, etc.
I'm going crazy trying to figure this out! I have talked with several specialists and they cannot figure it out either. Could it be the MPEM/ECU itself even though I am getting fuel and spark? Is there a way to check the MPEM/ECU before spending a lot of money on a new one? Is there a way to hire a specialist to help me through this problem? I'm willing to pay a consulting fee. Please provide any help you can.
Thanks,
Kevin
1. Getting good compression (155 psi/cylinder).
2. Good fuel flow (observed good fuel spray from the injectors while cranking after removing the fuel rail from the engine).
3. Hot spark (getting a hot 1/2 inch spark from each wire to the top of each plug during cranking)
4. Fuel pressure is showing 56 psi during cranking.
5. Measured 6 volts at each injector.
6. Checked resistances on all sensors and found them all to be within specs.
7. Battery is new. Voltage is above 12 volts.
8. Spark plugs are new and clean.
9. Checked all fuses at MPEM and rear electrical box. All are good.
The problem happened a couple months ago. Again, the engine was running great when it died suddenly (like someone turned off the key switch). After sitting for a couple days, the engine will run for about 5 seconds on the first crank. After that, it will not run at all on the second, third and fourth cranks, etc.
I'm going crazy trying to figure this out! I have talked with several specialists and they cannot figure it out either. Could it be the MPEM/ECU itself even though I am getting fuel and spark? Is there a way to check the MPEM/ECU before spending a lot of money on a new one? Is there a way to hire a specialist to help me through this problem? I'm willing to pay a consulting fee. Please provide any help you can.
Thanks,
Kevin