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1985 Ford E350 460 V8 Holley/Motorcraft carb 4180-C.
I have a 1985 Ford E350 Mobile Traveler (motor home) with a 460 V8 7.5 liter engine with a Holley / Motorcraft 4 barrel carburetor model 4180-C.
Long story short. It cranks over but will not start. Until recently, it started, ran and idled fine. It worked great. I started it every day and it worked fine. Then one day, it would not start or idle.
Presently, I can use starter fluid and it will start and run, but it will not idle. I have to keep giving it gas for it to remain running.
It seems to want to start by itself in the colder months.
At this time I took it on a couple of long trips with no problems other than having to use starter fluid half the time.
Around May or June of this year, I took the carburetor apart, adjusted the floats per spec, made sure all the ports and holes were clear so it would get gas, I replaced the seals, put it back on, and it started every time and idled fine. I would start it every couple of days. It ran great.
I let it sit for a couple of weeks, it got warmer, and I am back to it not starting without starter fluid again. However, this time it will not idle. It will keep running if I give it gas, but it will not idle and it dies when I take my foot off the gas.
I have set the choke to all positions and tried it, but no luck, it still will not start by itself or idle.
I have changed the fuel filter, checked to see if it is getting gas, which it is, made sure all the vacuum hoses are connected, etc.
The fuel pump is working.
I did not adjust or mess with the idle screw or the accelerator pump, or the mechanical pump or the power valve or anything else. These 2 pumps have new diaphragms in them, from the previous owner, who apparently tried rebuilding it too. I could see all the seals were new, as is the power valve, and fuel inlet needles.
I also tried bypassing the oil pressure switch with no luck.
My question is, what other components on the engine that may cause this problem. I am wondering if there is a vacuum diaphragm or solenoid or sensor or what??? Or does it just need a new carburetor?