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1986 F150 issue...eek

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Old 07-25-2008, 10:30 PM   #1
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Default 1986 F150 issue...eek

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Last edited by jljde; 03-01-2011 at 12:19 AM.
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Old 07-26-2008, 02:39 AM   #2
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Welcome to the forum! I think of 3 possibilities - vacuum leak, fuel pump issue, or something wrong with carb. If it's driving fine, fuel pump will be excluded from the list.
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Old 09-20-2008, 12:28 AM   #3
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was the leaf in the carb or in the breather?
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Old 09-21-2008, 10:36 PM   #4
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The choke is not functioning correctly. With this kind of problem it is usually the coke unloader, or the electric heater in the automatic coke control. with the engine cold remove the air cleaner. Depress the foot feed once to set the choke. start the truck, have a friend watch how the choke operates, make sure he stands away form the engine compartment in case there is a back fire. When you depress the foot feet when the engine is cold the choke will close. make sure the step up cam is working this increases the idle speed. When the engine starts the unloader will modulate the coke plate so the engine is not starved for air, as the electric heater for the coke coil operates the choke will slowly open. If you don't see the plate modulating it is the unloader, if you don't see the choke opening slowly as the engine heats up the choke coil needs to be replaced
The one thing I don't know about 1986 carburetor is if it uses a heat tube from he exhaust manifold to bring in hot exhaust from the engine into into the coke coil. If you have one make sure the tube is attached and it is it is not coked shut..

The first thing I would do is get yourself a can or two of spray carburetor cleaner and hose the carb' down and make sure everything is clean, and all of the linkage is working smoothly. this might just do the job.

The single barrel carburetor the 4.9L 6 has is a simple unit to rebuild but If you don't feel comfortable working with carburetors, I would take it to a tune up shop that has the experience and have them do the job.
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Old 09-23-2008, 03:01 PM   #5
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Do you take it off-roading?
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Old 10-25-2010, 06:28 PM   #6
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Question O2 sensor connection

Hello Guys,
i dont know if im on the right page, so here it goes. I have a 1984 f150 with the feedback carb. I have an O2 sensor that is not connected. can anyone tell me where this goes connected? unfortunately this system is hacked up and im having to put it back together. all help is greatly appreciated.
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