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Hey guys, I am hoping you can help me with an issue I am having with my truck. For those that dont know, it is a 429 with a mild cam, aluminum heads and a sual plane intake. The issue I am having is when the engine gets hot, it likes to stall. There are two symptoms that I am getting. The first one is that after driving the truck for a while, then shutting it off for a while, like when getting lunch or something, it will start up fine, but then stall after about a minute of running. It is very hard to start after that and I have to hold the throttle open half way to get it to fire again.
The second symptom I am getting us that after this happens it will stall while going down the road. Sometimes I can pump the gas and it will start up again, sometimes I have to pull off the road try to start it. One thing I have noticed is that If i open the hood, it seems to start easier.
I dont know if its related as well, but sometimes when shifting gears under high throttle, it will stall, but fire right back up when I get back in the gas.
I kind of have a gew ideas of what it might be, but was hoping someone here might be able to give me some guidance.
Last edited by Gicknordon; Feb 21, 2018 at 05:17 PM.
Reason: Spelling errors
As far as I can remember, it started when my rtr msd distributor went out. I ended up replacing the coil, and bypassing the computer in the distributor and running a digital 6al box to run the ignition. I have a mechanical edelbrock fuel pump. I have an msd blaster 2 coil. I had issues with the coil overheating before, but that would just shut the motor down completely and I would have to wait for the coil to cool down before it would start. The fact that it will fire back up if I pump the gas makes me think it is more fuel related.
I suspect the fuel is boiling where the fuel line is routed in close proximity to the heat of that 429, and/ or you have a small leak somewhere in the fuel line and it's pulling more air through when the conditions are just right. Is your fuel tank clean and new?
I suspect the fuel is boiling where the fuel line is routed in close proximity to the heat of that 429, and/ or you have a small leak somewhere in the fuel line and it's pulling more air through when the conditions are just right. Is your fuel tank clean and new?
Fuel tank is a brand new mustang tank. I think I might have my fuel line too close to the thermostat housing. Do you think that could be making the fuel boil? I will also have to take a look at how close my fuel line is to the header on the frame rail
You could be picking up a fair amount of heat from that housing. The stock line runs between the distributor and t-stat housing- still close but not over the source of heat.
I am not saying this is your problem, but it looks like you are missing an idle mix volume screw on your rear metering plate? Also I would have a another look at your float levels with the engine at operating temperature. Its' amazing what a bad float level will cause.
I am not saying this is your problem, but it looks like you are missing an idle mix volume screw on your rear metering plate? Also I would have a another look at your float levels with the engine at operating temperature. Its' amazing what a bad float level will cause.
This particular holley only has the idle screws on the primary circuit. Ill have to check my float level next time I run it. Its supposes to rain here the next few day so I wont have a change to test it.
Aluminum intakes transfer a lot of heat to the carb, might want to double up on the gaskets under the carb. But ultimately I'd bet you end up with an electric pump. It's a long ways to draw fuel from the rear mounted tank, just invites trouble.
Hey Nick,
Do you hear a loud noise coming from the tank when you open it? Are you running a vented
or non-vented gas cap? Did you add a vent to your new gas tank?
If you don't have adequate ventilation to your tank ... you can get starved for fuel.
I'd look at getting a 1" phenolic spacer under your carb. That should eliminate any possibility of vapor lock or boiling fuel in the carburetor. I've had similar issues with an Edelbrock carb and the spacer fixed it for me.
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