ENGINE STOPS WHEN PUT IN TO NEUTRAL QUICKLY

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   Hi AllHope you can helpWe have a year 2000 super air nautique with the 8.2 litre python engine.
It runs OK but if you back the throttle off quickly in to neutral the engine will stop. It you back off slowly it will keep running.
Has anybody come across this type of problem before of have a suggestion to fix it.
I suspect that this might happen on any engine.
My thought is electrical but not sure where to start on this.
All suggestions appreciated

As I'm writing I guess the smart answer from some will be just to back off slowly but when you are going to pick up a boarder or skier in the water the last thing you want is for the boat to be unpredictable and to stop and therefore be out of control.

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robbo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: August-27-2019 Location: gl53 9ee Status: Offline Points: 9	Post Options Post Reply Quote robbo Report Post Thanks(0) Quote Reply Topic: ENGINE STOPS WHEN PUT IN TO NEUTRAL QUICKLY Posted: April-03-2022 at 5:41am
	Hi All Hope you can help We have a year 2000 super air nautique with the 8.2 litre python engine. It runs OK but if you back the throttle off quickly in to neutral the engine will stop. It you back off slowly it will keep running. Has anybody come across this type of problem before of have a suggestion to fix it. I suspect that this might happen on any engine. My thought is electrical but not sure where to start on this. All suggestions appreciated As I'm writing I guess the smart answer from some will be just to back off slowly but when you are going to pick up a boarder or skier in the water the last thing you want is for the boat to be unpredictable and to stop and therefore be out of control.

JoeinNY Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5697	Post Options Post Reply Quote JoeinNY Report Post Thanks(0) Quote Reply Posted: April-03-2022 at 8:09am
	I would start with looking for dirty injectors and go from there - if your putting hours on it you might be able to see improvement by running some fuel injector cleaner through it.
	1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" Holeshot Video

MrMcD Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3654	Post Options Post Reply Quote MrMcD Report Post Thanks(0) Quote Reply Posted: April-03-2022 at 1:59pm
	I repaired a 2002 last year, cleaned the injectors and everything worked like brand new but my injector issue was caused by bad fuel, not the same as your issue. Sometimes a dirty throttle plate and entrance to the throttle body can plug the air bleeds and cause idle issues. Many times you clean the throttle plate and entrance to the throttle body with carb clean and a rag and things start working well again. A white or light colored rag will show what you are removing with the carb clean and wipe, sometimes you get a lot of black gunk out of there.

robbo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: August-27-2019 Location: gl53 9ee Status: Offline Points: 9	Post Options Post Reply Quote robbo Report Post Thanks(0) Quote Reply Posted: April-04-2022 at 3:39am
	Hi JoeinNY and Mr McD Thank you both for your excellent suggestions - can't get to the boat until next weekend but will get some carb cleaner and bits during the week. Will post an update after cleaning. Kind regards ps - I wonder whether fuel from metal petrol cans could be part of the problem.

MrMcD Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3654	Post Options Post Reply Quote MrMcD Report Post Thanks(0) Quote Reply Posted: April-04-2022 at 8:34pm
	Old fuel does not work well. Anything over 6 mos old is Old Fuel in todays market unless recent upgrades have taken place to our fuel supply. Even lawn mower shops have signs up telling folks not to use any fuel older than 6 mos in the lawn mowers. I think I would run gas up to 9 mos old but no older by choice. You can add fuel and dilute the mix but it does not fix the bad fuel. The Python I worked on had 4+ year old gasoline in it and it had turned to a gel.

63 Skier Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4256	Post Options Post Reply Quote 63 Skier Report Post Thanks(0) Quote Reply Posted: April-04-2022 at 10:33pm
	The problem is you need a bigger engine. J/K! What are your idle rpm? Does it stumble when you put it in gear, or in gear at idle when you give it some throttle? Or only happens when quickly throttling back into neutral? Good advice from Joe and Mark, start there.
	'63 American Skier - '98 Sport Nautique

robbo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: August-27-2019 Location: gl53 9ee Status: Offline Points: 9	Post Options Post Reply Quote robbo Report Post Thanks(0) Quote Reply Posted: April-05-2022 at 5:26pm
	Hi 63 Skier, Idle rpm is 650 - I think this is governed by the ecm and there is an air valve on the throttle body to compensate for any difference. Yes, it only happens when quickly throttling back into neutral. Regards ps Hope this means I need an extra 2 cylinders!!!!

ENGINE STOPS WHEN PUT IN TO NEUTRAL QUICKLY

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