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More '96 Challenger issues

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PieceOfWork2004

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After a whole season of messing with my '96 Challenger I finally thought I had all the gremlins worked out but now another nasty one has snuck up on me. I have started it up in my driveway quite a few times over the last two weeks just to make sure everything was working as expected before I got stuck on the ramp with a dead boat again. Everything seemed fine, it fired up on the first shot almost every time.

I finally got some time to take it down to the lake this weekend and decided to fire it up one more time before I left just to make sure everything was good to go. It started up just fine but seemed to idle at a much higher RPM than it previously did. The tach is broken so I'm basing this observation solely on the noise generated by the engine but if I had to venture a guess I'd say it was somewhere in the 3-4k RPM range.

If I put the thing in gear it instantly red lines, it seems like the throttle was stuck wide open but as best as I can tell it's not. I can see the throttle cable moving back and forth and the valves at the base of the carb opening and closing. Half the time I can shut down the engine by pulling the DESS key or hitting the stop/start button but there have been a few occasions where I had to either yank the choke or turn off the fuel system all together.

A friend suggested taking a look at the throttle linkages to see if something was bound up but as best as I can tell they're good to go. The throttle has a little more play in than I remember, maybe an inch or so before it does anything, but he said that's pretty typical.

I can't think of anything that changed in the span of two days... all I did was put the airbox and filter back on but that's about it. I looked for anything in that area that I could have jarred while hanging upside down trying to get the cover back on and didn't see anything that was out of whack.

As always, thanks again for your help. I'm not a PWC expert by any stretch of the imagination but with your help I'm slowly beginning to figure out how these things work!
 
If the engine is warm it might just act like it . There is possibly an air leak somewhere. If it is relatively warm and it races away, the choke will shut it down. What is happening is the inside of the engine is hot and the spark plug is firing the mixture due to the temperature. It is similar to a RC engine that uses a glow plug to fire the fuel. When you choke the engine, the cool fuel entering cools everything down, and it shuts down. Chances are it won't do that in the water due to the load on the impeller. You should only run your seadoo at an idle when it is either on the hose of on the trailer.

karl
 
I guess my biggest question is do you think it would be safe to put in? General consensus with friends is to give it a whirl in the water and see what happens. Unfortunately it seems like it's all or nothing with this thing out of the water, I'd hate to put it in and have it take off like a bat out of hell. Actually that doesn't sound like a bad idea, I just don't want to have to try and nurse it back in to shore and on to the trailer if I can only run it WOT!

I figured it running with the key pulled was something like what you described. Would I be right in saying if the cylinder was hot enough it could cause the fuel to ignite without the plugs ever firing?

Thanks!
-Eric
 
Yes Eric, Exactly. Like the RC( radio control) cars...I own 2 monster trucks that run on Nitro Methane. The glow plug never fires, it just glows red hot to ignite the fuel. Your seadoo won't run off at WOT. The friction of water load on the jet pump will prevent that. I had my 1997 challenger do this too on the trailer. It's not uncommon. Actually if it does it again, you could pull off the lanyard, pull the spark plug caps, and it will still run at a high rpm. Close the choke, and the engine will stall with the cold fuel entering the combustion chamber. Don't worry about it, go have fun. Remember to only run it at an idle on the trailer or garden hose.

Karl
 
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