1986 F150 5.0 bucking
Hello all. I have a 1986 F150 5.0 multiport FI that I saved from a junk yard. It doesn't have O2 sensors on it. There is custom duel exhaust with no converters on it. Does anyone know if this truck is supposed to have them and how many? I can't find any wiring anywhere that would suggest that it even had any on it to begin with. Also it has a funky thing it does. When started it will not take the throttle. If I push too hard it will buck and jump. If I push lightly it will slowly accelerate until it reaches a certain rpm at which point it will buck and jump again. If I shut it off and restart it runs perfect for about 2 minutes then starts that jumping again. Sometimes it doesn't do it at all and runs great. I have replaced a bunch of stuff trying to fix it to no avail. I have replaced distributor, ignition module, map sensor, air charge temp sensor, computer, timing chain and gears, TPS. Deleted egr. Help please!!
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Fuel pump and or filter, inline fuel filter is a cheap shot
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I forgot to say fuel pump was replaced. Fuel filter has been replaced as well. The tank was clean when pulled to replace fuel pump. Has good fuel pressure.
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I'm curious how it's fuel injected without O2 sensors. That part makes me wonder if somebody sent it to the wrecking yard before finishing the header install. Can you see any dangling wires that an O2 sensor could plug into? Have you crawled under it to see if the O2 senors are underneath in a place not easy to spot?
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Yes I have look all over for them. It has stock manifolds on it. It did have some exhaust on it when I got it but no O2 sensors or wires anywhere. I'm wondering if the bucking and jumping is wh they sent it to the yard. How hard would it be to convert to carberated?
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Originally Posted by Turbo4man
(Post 6047271)
Yes I have look all over for them. It has stock manifolds on it. It did have some exhaust on it when I got it but no O2 sensors or wires anywhere. I'm wondering if the bucking and jumping is wh they sent it to the yard. How hard would it be to convert to carberated?
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The wire for the O2 comes from the computer harness on the drivers side, across the back of the engine to the passenger side near the back of the exhaust manifold.
Careful, some vacuum lines from the passenger fender run parrallel behind the engine to the drivers side vacuum tree, etc.. |
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