Idle problems with 83 SN

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   My 83 Nautique has been running great all summer until the last couple of weekends.  My problems began with a cold start at the boat ramp when it did not want to idle when it was cold.  After running it a while it seemed to do OK the rest of the day.
Now it will crank and runs fine at fast idle but when i pull it back to neutral it will idle at 600 for a moment or two then drop a couple of hundred RPMs and shutter and cut off.

I checked the inlet filter on the Holley and replaced the points, condenser, cap and rotor but it has not improved.

Anyone have any ideas????????????????

thanks
Marshall
NC  

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83SNGUY Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: July-29-2007 Location: United States Status: Offline Points: 21	Post Options Post Reply Quote 83SNGUY Report Post Thanks(0) Quote Reply Topic: Idle problems with 83 SN Posted: September-02-2013 at 9:38pm
	My 83 Nautique has been running great all summer until the last couple of weekends. My problems began with a cold start at the boat ramp when it did not want to idle when it was cold. After running it a while it seemed to do OK the rest of the day. Now it will crank and runs fine at fast idle but when i pull it back to neutral it will idle at 600 for a moment or two then drop a couple of hundred RPMs and shutter and cut off. I checked the inlet filter on the Holley and replaced the points, condenser, cap and rotor but it has not improved. Anyone have any ideas???????????????? thanks Marshall NC
	mdc615

OldSchoolBlue84 Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: December-02-2012 Location: Valparaiso, IN Status: Offline Points: 814	Post Options Post Reply Quote OldSchoolBlue84 Report Post Thanks(0) Quote Reply Posted: September-03-2013 at 12:00am
	Not an expert but will give it a try.... Did you ever run the boat with low to no gas? See if you are dumping fuel in the carb, open the choke plate and take a look. It's possibly you have debris causing the floats to stick. I had similar problem and had to remove the air/mixture screw and blew some carb cleaner through it following it with air. Did some adjustments and runs good. Good luck
	Kostas 1984 Ski Nautique 2001

83SNGUY Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: July-29-2007 Location: United States Status: Offline Points: 21	Post Options Post Reply Quote 83SNGUY Report Post Thanks(0) Quote Reply Posted: September-03-2013 at 11:12am
	Thanks Kostas, I will give that a try...
	mdc615

Henner Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: August-14-2013 Location: Oklahoma Status: Offline Points: 17	Post Options Post Reply Quote Henner Report Post Thanks(0) Quote Reply Posted: September-04-2013 at 12:09pm
	Was just going through the same issues. While the boat is running close both of the air/fuel screws on the metering block and see if the boat continues to idle.

83SNGUY Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: July-29-2007 Location: United States Status: Offline Points: 21	Post Options Post Reply Quote 83SNGUY Report Post Thanks(0) Quote Reply Posted: September-04-2013 at 12:21pm
	Thanks Henner, I will try that and see what happens......
	mdc615

phatsat67 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157	Post Options Post Reply Quote phatsat67 Report Post Thanks(0) Quote Reply Posted: September-04-2013 at 12:32pm
	If it is truly running off the idle circuits you should be able to kill the engine with one mixture screw.

phatsat67 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157	Post Options Post Reply Quote phatsat67 Report Post Thanks(0) Quote Reply Posted: September-04-2013 at 1:22pm
	When you mean base gasket do you mean carb to intake or throttle body to main body? The intake to carb gasket has to come from PCM to my knowledge because it has thicker side on the drivers side of the engine to cover up the exhaust cross over port.

Idle problems with 83 SN

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