I have a 1984 Ford F150 inline 6 4x4 with 1bbl carb. The truck will crank and run for about 15-20 min then shut off and wont restart for about an hour or so. I have replaced the fuel line from the Pump to the carb and the filter that goes into the carb. I also replace the Ingition Module, Ignition Coil, Plugs, Wires, Distributor Cap and Rotor...But still have the problem please help me.
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Re: Truck will crank and then shut off
You will need to do your testing while the vehicle is in failure to start mode.Check wether the coil is recieving 12v and pour a little fuel down carb to see if it wants to run.If pouring a little fuel down carb makes the car try to fire up you probably have a fuel pump issue.If it doesnt try to fire you have an ignition problem.Hope you get it sorted and good luck.
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Possible things to be considered: Float level too high, needle has a bad seat and won't shut off, vacuum leak (either internal or base gasket), choke not properly adjusted.
My money would go on a carb. rebuild kit (but only if you feel comfortable attempting it) it's not all that difficult, but you MUST be (1) an absolute nut about cleaning it all very well, and (2) the various gaps, clearances, adjustments, must be made with excruciating precision.
This will be a lot cheaper than a rebuilt carb., and you'll get the satisfaction of doing it yourself.
While you're at it do a general tune up.....plugs, points condenser, wires , air filter, PCV, etc.
In general, yes. This is a carb tuning issue. Another possibility is a vacuum leak somewhere, but most likely, it's a carb issue. You'll typically see your rpm drop a bit when you put it in gear, but that it sometimes stalls out points to a carb issue.
your truck is a 4.9L, make sure you have power to the front tank fuel pump. is the power to the pump is ok and you can hear the pump run for a second or two when you key the vehicle on... replace the fuel tank selector valve
sounds almost like the newer vehicles equiped with cam sensors instead of the distributer system i had a similar problem with an 87 ford bronco 2 it would stall out right around 2800 rpm i replaced the control module usually mounted on the distributer at least mine was and it fixed it right up but as for ur truck im not sure they are only like 30 bucks at autozone or something worth a try right??