Cold Idle |
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jwweathers
Newbie Joined: July-09-2015 Location: Alabama Status: Offline Points: 21 |
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Posted: 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
Newbie Joined: June-19-2014 Location: So. Illinois Status: Offline Points: 16 |
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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
Newbie Joined: July-09-2015 Location: Alabama Status: Offline Points: 21 |
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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
Newbie Joined: July-09-2015 Location: Alabama Status: Offline Points: 21 |
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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
Gold Member Joined: June-24-2013 Location: Illinois Status: Offline Points: 721 |
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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
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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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
Newbie Joined: July-09-2015 Location: Alabama Status: Offline Points: 21 |
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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
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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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
Newbie Joined: July-09-2015 Location: Alabama Status: Offline Points: 21 |
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Sounds like you might need to adjust your electric choke or fast idle screw...
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hdspringer99
Newbie Joined: June-19-2014 Location: So. Illinois Status: Offline Points: 16 |
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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
Newbie Joined: July-09-2015 Location: Alabama Status: Offline Points: 21 |
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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
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11062 |
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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
Newbie Joined: July-09-2015 Location: Alabama Status: Offline Points: 21 |
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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
Grand Poobah Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2958 |
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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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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
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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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
Newbie Joined: July-09-2015 Location: Alabama Status: Offline Points: 21 |
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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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