Hard start when hot
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Senior User
Joined: Jan 2003
Posts: 192
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From: Gilbert, Arizona (Phoenix
Hard start when hot
Thanks to all who helped with my carb problem. I have taken your advice and now have a Carter AFB 625 carb on the truck. I've got a 460 with automatic as well.
When the truck is cold, and there is plenty of life on the battery, the truck starts relatively easily. However, if I drive the truck and let it heat up, it's a nightmare to get started back up. I usually wind up needed a jump start because I wear the battery down pretty quickly. I'm pretty sure I'm flooding it with gas, so I don't think fuel is the problem. Any suggestions? I was thinking timing, but wouldn't that prevent it from starting when it was cold as well as hot?
When the truck is cold, and there is plenty of life on the battery, the truck starts relatively easily. However, if I drive the truck and let it heat up, it's a nightmare to get started back up. I usually wind up needed a jump start because I wear the battery down pretty quickly. I'm pretty sure I'm flooding it with gas, so I don't think fuel is the problem. Any suggestions? I was thinking timing, but wouldn't that prevent it from starting when it was cold as well as hot?
Junior User
Joined: May 2003
Posts: 79
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From: Rockwood TN
Hard start when hot
Timing is temp sensitive, what works fine cold may cause severe starting problems when hot or even warm. If you fell like your flooding but not doing anything to cause it, check your needle valves are closing properly, sometimes they leak slow enogh that running down the road you just burn the extra fuel but during start/idle you get too much fuel.
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Senior User
Joined: Jan 2003
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From: Gilbert, Arizona (Phoenix
Hard start when hot
Thanks Dart. I'm planning on putting a couple of hours in on it this weekend. Timing is where I'm gonna start. Think the carb is good as I just picked it up. It's definitely a lot better than the Holley I had on there.
-Vinny
-Vinny
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Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
Hard start when hot
How does it crank over, is it dragging? If so the timing is too high, If it turns over good, try holding it to the floor when cranking it hot, it may be boiling the fuel in the carb after shut down. If it starts better holding it to the floor, you may need a heat shield under the carb.
Jimmy
Jimmy
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Joined: Aug 2001
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From: Nevada
Hard start when hot
New or newer battery? Have it checked at a parts store.
Primary battery cables tend to fill up with corrosion and when hot won't properly transfer current to the solenoid, sounds just like a weak battery.
Primary battery cables tend to fill up with corrosion and when hot won't properly transfer current to the solenoid, sounds just like a weak battery.
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Senior User
Joined: Jan 2003
Posts: 192
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From: Gilbert, Arizona (Phoenix
Hard start when hot
I've got two spacers between the carb and the intake. I don't think the fuel is boiling. The battery is brand new as are the cables. I'm still going to try the timing.
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Senior User
Joined: Apr 2003
Posts: 432
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From: Oregon Coast
Hard start when hot
Two spacers? That will kll the signal to the boosters and it won't pull fuel properly. The lower the engine speed the worse this will cause the problem. You changed carbs and you still have the same problem there most likley was nothing wrong with your old one. Are your fuel lines routed away from any heat sources. You might try insulating them to help keep your fuel cool.
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