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jwweathers 
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Joined: July-09-2015 Location: Alabama Status: Offline Points: 21 |
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 Topic: Cold IdlePosted: July-10-2015 at 4:19pm |
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85 SN 2001 with 351w. Idles and runs flawlessly when warm. Will stall at idle when cold. Is this just the nature of a carburated engine? Or is there something I can do??
Jeff |
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hdspringer99
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Joined: June-19-2014 Location: So. Illinois Status: Offline Points: 16 |
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Posted: July-10-2015 at 4:38pm |
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Sounds like a choke issue. Have you adjusted your choke or watched it when starting and running cold?
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jwweathers
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Posted: July-10-2015 at 6:02pm |
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I am newbie when it comes to carburated engines. I am used to EFI. When I start the boat, I pull the cylinder next to the throttle arm out and turn the key. Once the engine fires, I give it a bit of throttle and keep it there until the engine warms up. If I let off of the throttle before it is warm, the engine will die. Is that normal?
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jwweathers
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Posted: July-10-2015 at 6:12pm |
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Oh...and I pump throttle arm wide open and closed once before I do anything. Is this the right way to start a carbureted 351w?
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Chevy350
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Posted: July-10-2015 at 7:23pm |
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I usually do the same if our boat doesn't start right away the first time. |
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1972 Mustang
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: July-10-2015 at 8:03pm |
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Jeff,
You're doing everything correctly. Do check the choke. The butterfly should be 1/8" open when cold and then slowly open as the engine warms up. Yes, Fords are notoriously cold blooded! 
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jwweathers
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Posted: July-10-2015 at 9:06pm |
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So mine definitely doesn't open slowly. It snaps open a while after I turn on the key.
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SNobsessed
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Posted: July-10-2015 at 11:00pm |
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Mine doesn't idle well for the 1st minute of operation. I start it & hold at 1500 for about a minute. Then it's into reverse for the trailer backoff.
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“Beer is proof that God loves us and wants us to be happy.”
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jwweathers
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Posted: July-10-2015 at 11:18pm |
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Sounds like you might need to adjust your electric choke or fast idle screw...
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hdspringer99
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Posted: July-11-2015 at 12:06pm |
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Holley has a good video on YouTube on adjusting your choke. http://youtu.be/0H5IBSFgYJE. Search "Hollley 600 Choke Adjustment"
You are warming yours up the same way I do, however if the choke is adjusted and working correctly you should not have to mess with the throttle while it warms up. The electric choke opens up over time as the voltage is applied to the choke coil. It is dependent on time, not the actual engine temperature. Also adjust your idle screw with the transmission engaged once you in the water. This may be another reason you are stalling when cold at idle. |
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jwweathers
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Posted: July-11-2015 at 7:56pm |
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I adjusted the electric choke so that the plate opens and closes properly during a cold start. In doing so, however, I noticed that I am missing the fast idle cam lever. So, there is no way to adjust the fast idle speed. Someone must have removed it at some point, right?
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KENO
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Posted: July-11-2015 at 10:36pm |
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Hi Jeff
The marine Holley doesn't have the same setup that an auto one does for a fast idle cam. There is a plastic piece they call the cam but there is no way of adjusting a "fast idle speed" with an adjustment screw and stepped cam, like on the automotive version. The Holley video is for the automotive version. To me,you're doing it right and you probably aren't missing any parts except the ones Holley purposely left off. You are the manual fast idle cam controlling it with the throttle lever while in neutral Like Pete said you're doing it right and could maybe use a little adjustment of the electric choke KenO |
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jwweathers
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Posted: July-12-2015 at 1:43am |
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I wonder why they would leave that off. Would it hurt to add a fast idle cam lever so that I can control the fast idle on a cold start?
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Jonny Quest
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Posted: July-12-2015 at 2:42am |
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You DO control the fast idle. That's what the throttle lever is for... 
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63 Skier
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Posted: July-12-2015 at 2:52am |
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Now that the choke is working correctly, does it still die on you? If so, how long before it will idle without adding throttle? I'd say up to a minute might be considered normal, if it takes longer than that to be able to hold idle without stalling then there's still something wrong.
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Bri892001
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Posted: July-12-2015 at 10:25am |
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Not only is it not needed, it would be aittle dangerous to have. Cars have brakes if they were accidentally put into gear during fast idle. If someone accidentally moves a boat lever into gear, it's taking off. |
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jwweathers
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Posted: July-13-2015 at 12:15am |
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Good point. Glad to know the carb is correct. I will leave it that way. Thanks for all of the knowledge, guys. I really appreciate it.
Jeff |
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jwweathers wrote: