ENGINE MISSING AND STALLING

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   Once my 80 Ski Nautique is warmed up (about 15 - 20 minutes) it starts missing and eventually stalls.  After that, it has a hard time starting and will quickly stall at idle.

I have performed a full tune up (with the exception of the coil) and I have had the carb re-built.  The same problem persists.

Any suggestions?

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BEBS Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: August-05-2004 Location: United States Status: Offline Points: 4	Post Options Post Reply Quote BEBS Report Post Thanks(0) Quote Reply Topic: ENGINE MISSING AND STALLING Posted: August-05-2004 at 1:55pm
	Once my 80 Ski Nautique is warmed up (about 15 - 20 minutes) it starts missing and eventually stalls. After that, it has a hard time starting and will quickly stall at idle. I have performed a full tune up (with the exception of the coil) and I have had the carb re-built. The same problem persists. Any suggestions?

79nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872	Post Options Post Reply Quote 79nautique Report Post Thanks(0) Quote Reply Posted: August-05-2004 at 4:01pm
	Do you still have the org. point style dist.? If so check the points and condenser and the coil is a possiblility as well. If you have convert it to electronic check the module. Once the engine gets up to temp the heat could be effecting the condenser, coil or module causing a short thus the mis-fire.

David F Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770	Post Options Post Reply Quote David F Report Post Thanks(0) Quote Reply Posted: August-06-2004 at 12:43pm
	Also check the ballast resistor by connecting a jumper wire across the two terminal posts. If the engine then runs fine, replace the ballast resistor soon as you risk burning up the coil.

Dan-H Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: June-24-2004 Location: United States Status: Offline Points: 4	Post Options Post Reply Quote Dan-H Report Post Thanks(0) Quote Reply Posted: August-08-2004 at 5:57pm
	Have you confirmed it is a no-spark condition when it is failing? easy to-do, just bring a timing light. Assuming it is no-spark, bypassing the ballast resistor might mask a weak coil. best to test the ballast resistor with a voltmeter when it is having problems. Or just try a new coil. they are cheap and easy to replace.
	83 ski nautique

Tim D (#2) Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: April-26-2005 Location: United States Status: Offline Points: 4	Post Options Post Reply Quote Tim D (#2) Report Post Thanks(0) Quote Reply Posted: April-26-2005 at 5:12pm
	My '85 sn 2001 did the same thing. After checking it all out it turned out to be a combination of two things. Fuel filter partially clogged and the coil. I agree with Dan. Go ahead and replace the coil.
	Tim D (#2)

Jim_In_Houston Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Platinum Member Joined: September-06-2004 Location: United States Status: Offline Points: 1120	Post Options Post Reply Quote Jim_In_Houston Report Post Thanks(0) Quote Reply Posted: April-26-2005 at 5:23pm
	I am amazed at how often coils do fail. It must be the heat and vibration that does them in. Until recently I have carried a spare coil under my seat - I had to use it. I have never had a ballast resistor fail although I can see how it is extremely possible.
	Happy owner of a '66 and a '68 Mustang

JEFF KOSTIS Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: April-19-2005 Location: United States Status: Offline Points: 817	Post Options Post Reply Quote JEFF KOSTIS Report Post Thanks(0) Quote Reply Posted: April-27-2005 at 12:34am
	More than likely it does sound like a ignition problem, however if that doesnt cure it you might want to pay attention to the fuel system. See when it misses/stalls if its running too rich or lean. (black smoke?) Our 1974 mustang 17 omc 225 for a while would not idle and run rich when it got up to temp and it was due to just a bit too much fuel pressure to the carb. We had this problem for a while and took a while to figure out. I kept on playing with the carb float and no change. To make a long story short I fabricated a spacer for the fuel pump to achive 5 lbs of pressure. The float(new and old) could not handle the hot fuel since its less boyant. Good luck!!!!

David F Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770	Post Options Post Reply Quote David F Report Post Thanks(0) Quote Reply Posted: April-27-2005 at 3:35pm
	Seems to me that the problem is a stuck or non-sealing needle valve in the carb. During warm-up, the engine likes and needs the extra fuel. However, after warm-up the extra fuel will flood the engine while trying to idle. Simple check is to look down the throat of the carb while it is idling. If fuel is dribbling or pouring out of the venturies, then the needle valve is not closing properly. Other clue is hard starting once the engine dies from flooding. If the engine requires full throttle starts, then another sign of a flooded engine.

Tim D Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: August-23-2004 Location: United States Status: Offline Points: 2641	Post Options Post Reply Quote Tim D Report Post Thanks(0) Quote Reply Posted: April-27-2005 at 4:04pm
	Check the intake manifold, might be some loose bolts. When it is missing, are there any signs of black smoke? Did you replace the distributor cap and rotor? If it is your coil, Accel makes a coil for heat and vibration. I have it on my boat, it has a gel instead of oil in it.
	Tim D

JEFF KOSTIS Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: April-19-2005 Location: United States Status: Offline Points: 817	Post Options Post Reply Quote JEFF KOSTIS Report Post Thanks(0) Quote Reply Posted: April-28-2005 at 12:23am
	As i was going to sleep last night I thought of another possibility if its not a fuel issue. Have had PCM 302/351 and OMC 225 engines with either presolite or mallory distributors fog up inside the cap due to the engine warming up and water evaporating from the hull. I noted this especially happens on cooler, more humid days (first thing in the morning) and no matter what it doesnt want to run and gets worse. A missing or damaged gasket that goes on the cap can give you serious problems. My neighbors Ski Centurion did the same thing but it was a hot, non-humid day. Put on a new gasket (missing)-all ok. However we can be guessing forever, we need to know if its a fuel problem (running rich) to rule out ignition.

80nauts Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: March-19-2005 Location: United States Status: Offline Points: 93	Post Options Post Reply Quote 80nauts Report Post Thanks(0) Quote Reply Posted: April-30-2005 at 2:30am
	Usually a when a fuel pump starts to go out of service it will fail when it warms up. If you let it sit for a while then it will start again but usually fail even faster since it was previously warm. Eventually it will completely fail. It sure sounds like that is what's happening by it not starting anymore after the first initial warm fail. If you replace it then make sure it is a marine grade pump even though they cost a lot. The automotive ones have a seepage hole to let you know when they go bad, but you relly don't want your boat filling with gasoline when it goes bad.

ENGINE MISSING AND STALLING

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