2000 gtx di idle issues

[roberth2013]

hey everybody, man was it a long winter, lol took the skis out this weekend, one of my DI's engine shuts off while idling in the water, starts right back up, runs great, as example, when were cruising around the lake it runs perfect, but when we come to a stop, or approaching the dock for loading them back on the trailer, idles for a few seconds then cuts off, any one dealt with this issue, im thinking maybe TPS, settings, I have a CANDOO SCANNER, thanks for any help

 

[Coastiejoe]

It does sound as though it is an idle adjustment issue. I would plug in the Candoo and see where it is set. Plus, you can reset it easy enough as you have the right tool...

 

[roberth2013]

hi joe, thanks for the reply, gonna give it a shot tomorrow, and see what comes up, felt great to get back on the water

 

[68ragtop]

The DI is unique in the way it controls idle. because it injects both air & fuel The machine should be able to keep its idle at 1450 whether its on the water, or on the trailer. same thing the 4 strokes do with IAC modules.
The initial (mechanical) idle & sync is set with the throttle body out of the ski & using a multimeter. If I remember correctly the screws are set from the factory & capped off, so you have to remove the caps to even get to them. So that really shouldn't have changed if it ran good last year. Re-learning the idle position sounds like a good place to start & is so simple to do seeing you have the candoo. Was this machine running good last year? Might want to try fresh tank of fuel too.

How is the compression? (holding the throttle wide open in flood mode)

 

[LKGrider]

Something cheap and simple to eliminate is throw a fresh new set of plugs in it

 

[ski-d00]

new plugs and check compression, report back. do not mess with the red capped idle screw, it is more complicated than just turning a screw to set the idle like the carb models. a real bear to get right once messed with even with BUDS. basically, if everything else is right, this will never need to be changed.

 

[68ragtop]

new plugs and check compression, report back. do not mess with the red capped idle screw, it is more complicated than just turning a screw to set the idle like the carb models. a real bear to get right once messed with even with BUDS. basically, if everything else is right, this will never need to be changed.

Yep, completely agree. They are capped for good reason. I took initial TPS values on the throttle bodies of a DI last year. I then went through the procedure for adjusting & sync'ing. When I was done, it was exactly what I started with. No reason for it to really change unless the bodies are taken apart or separated for some reason, or a previous owner messed with things.

Even if the TPS sensors are changed, they just need to have their idle values stored in the MPEM. Mechanically nothing changes.

Even in the very outside chance they could be out of adjustment, the MPEM can still adjust things to keep the idle @ 1450.

I would be checking:

1 compression
2 fuel quality
3 fuel/air pump pressure

Also outside chance your squeaking a piston. an overheated piston can friction seize the engine, & start right back up a few seconds later. Hopefully thats not the case, but a compression test should rule that out quickly.

Let us know what you find!