Sputtering Problem

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   Before you do anything, look down the throat of the carb when it is behaving badly.  Do you see excess fuel dribling from the venturies?  If so, your needle valve is not sealing properly.  Gumming caused by extended lay-up could be the cause.  Try using BG44K in the fuel tank before rebuilding the carb.

The engine will run fine immediately after start-up, because a cold engine can tolerate and needs the rich mixture.  But, a warm engine does not like the excess fuel.  Is the engine a bit harder to start after it is shut down for a few minutes?  If so, more signs of excess fuel leaking into the manifold and flooding the engine.

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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 Topic: Sputtering Problem Posted: May-25-2005 at 12:41pm
	Before you do anything, look down the throat of the carb when it is behaving badly. Do you see excess fuel dribling from the venturies? If so, your needle valve is not sealing properly. Gumming caused by extended lay-up could be the cause. Try using BG44K in the fuel tank before rebuilding the carb. The engine will run fine immediately after start-up, because a cold engine can tolerate and needs the rich mixture. But, a warm engine does not like the excess fuel. Is the engine a bit harder to start after it is shut down for a few minutes? If so, more signs of excess fuel leaking into the manifold and flooding the engine.

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: May-25-2005 at 10:53am
	Octane rating will not effect the idle. Your problem is most likely carb related and a rebuild is most likely needed. Double check for a vaccum leak and you may get lucky but usually a vaccum leak will not cause a surging idle on a carburated engine, on a computer controled engine it will because it will try and correct the problem caused by the leak.

Bradley950 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: February-07-2005 Location: United States Status: Offline Points: 168	Post Options Post Reply Quote Bradley950 Report Post Thanks(0) Quote Reply Posted: May-25-2005 at 10:11am
	You should be able to just disconect the PCV vavle and plug the hose to test. Plug it at the valve cover end. If it is bad your motor will proable idle down when its pluged. Vacuum leaks cause engines to do crazy things. -Brad-
	Brad Miller bradley950@yahoo.com

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: May-25-2005 at 12:31am
	Just a suggestion but not real familiar with that year, but does it have a PCV valve? Is it a PCM Ford? If so, it may be playing games with the intake vacuum at idle. It doesnt sound like a gas issue.
	MUSTANG COUNTRY 1974 Mustang 17 1976 Mustang 17

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: May-24-2005 at 6:41pm
	Did your tune-up include cleaning the carb? Could be the float set too high or needle valve worn out.
	Tim D

cam892001 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: April-12-2005 Location: United States Status: Offline Points: 5	Post Options Post Reply Quote cam892001 Report Post Thanks(0) Quote Reply Posted: May-24-2005 at 1:33pm
	I have an 89 2001 and I had everything re-done (plugs, wires, tune-up) over the winter. I've had the boat out about 4 times since I un-winterized it and it starts fine, runs perfect, but when I'm idling around at times it wants to choke out or rev up and down inconsistantly. I'm curious to know why this is happening. Could it come from bad gas or too high octane gasoline? Any help is appreciated...

Sputtering Problem

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