Dies when you get up to highway speeds
#1
Dies when you get up to highway speeds
I recently bought a 76 f250 super cab with a 460. The truck ran ok in town I recently bought a 1976 F250 super cab with a 460. It ran fine in town but when I got it on the highway it flooded out and died. The air filter was clogged so I figured that was it. I replaced it and it ran fine for a few trips then it happened again today twice when I gave it more gas. Both times when I removed the top of the breather it fired right up. I was thinkin it could be bad gas but why would it start without the breather? Any ideas? I posted this yesterday on new forum but thought this was a better place.
#3
The one that switches from exhaust to cold air.
#4
There is supposed to be a temperature sensor in the air cleaner housing. Some are vacuum controlled and others don't use any vacuum. When the engine is cold the incoming air to the carb is supposed to come up from the exhaust manifold through a snorkel and into the air filter. Once the sensor determines the air is warm enough it opens the snorkel to outside air. If the electric choke is not heating the element to hold the choke open the force of the incoming air will close the butterfly and starve the engine for air. I believe that is probably the only thing causing problems. That wire comes from one of the alt terminals . If you correct the electrical connection it should take care of the choke problem.
#5
There is supposed to be a temperature sensor in the air cleaner housing. Some are vacuum controlled and others don't use any vacuum. When the engine is cold the incoming air to the carb is supposed to come up from the exhaust manifold through a snorkel and into the air filter. Once the sensor determines the air is warm enough it opens the snorkel to outside air. If the electric choke is not heating the element to hold the choke open the force of the incoming air will close the butterfly and starve the engine for air. I believe that is probably the only thing causing problems. That wire comes from one of the alt terminals . If you correct the electrical connection it should take care of the choke problem.
#6
As far as I know that door, as it is called, does not rely on air to make it open. If the mechanism to make it open is missing, just find something to hold it open. It is only needed when starting the engine in cold weather.
#7
Thanks for the input. I did find the sensor in there. But I drove truck home without the breather on and it still died. I don't think it's bad gas because the truck wouldn't run fine in the driveway. Maybe a carb issue?
#8
Are you sure it is getting overfueled? You are telling us it flooded out , that would mean being overfueled. Could it be starving for fuel ? High speed places more demand for fuel . Insufficient fuel could be caused by a partially plugged fuel filter. Did you check that out? A 460 needs a lot of fuel and maybe it isn't getting enough at higher speeds.