1986 f150 302 problems
I have a 86 302 f.i. that is giving me trouble. It never has quite run right since we bought it, but now has become worse since it sat. Tank was nearly empty, but had maybe a gallon of fuel in it. We put five gallons of gas in it, and attempted starting. It would not fire while cranking, so I squirted fuel in the intake and it took off. Spitting, sputtering, idle is rough, and has no power. Eec tested fine and is working, bright blue spark, timing is at 12*. Fuel pressure sits at 32-35 idle, 40 when I rev it up. I can not get it to rev out. Fuel pressure does not change when the truck begins to stall. I'm thinking it has a bad bank of injectors, or a bad air speed sensor. Any insight?
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Sounds like dirty Injectors.
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Originally Posted by Mitchapalooza85
(Post 18579174)
Sounds like dirty Injectors.
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I honestly can't remember, my truck originally had that FI 302 until it died then I swapped to a new 302 carb setup. Sounds like it's starving for gas based on you having to add some to get it to crank up. Maybe prime the system by turning over the key (let the fuel pump prime the fuel system) then press onto the gas twice & repeat 2-3 times & see if it turns over. Does sound like an injector issue.
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Originally Posted by Mitchapalooza85
(Post 18579231)
I honestly can't remember, my truck originally had that FI 302 until it died then I swapped to a new 302 carb setup. Sounds like it's starving for gas based on you having to add some to get it to crank up. Maybe prime the system by turning over the key (let the fuel pump prime the fuel system) then press onto the gas twice & repeat 2-3 times & see if it turns over. Does sound like an injector issue.
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Originally Posted by Fordfarmer79
(Post 18579251)
Has fuel pressure instantly, and will hold pressure after key is shut off. I agree it's fuel, but why will it fire after a little gas in the intake?
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Originally Posted by Mitchapalooza85
(Post 18579324)
I think you answered your own question there. Fuel pressure is obviously making it to the rail but not into the combustion chamber which leads back to the Injectors.
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Originally Posted by Fordfarmer79
(Post 18579157)
I have a 86 302 f.i. that is giving me trouble. It never has quite run right since we bought it, but now has become worse since it sat.
Some places do injector services, price them to see which one is the better deal. |
Do you have power to your injectors?
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Originally Posted by vjsimone
(Post 18579515)
Do you have power to your injectors?
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Originally Posted by Fordfarmer79
(Post 18579524)
Have not verified that yet. Looking to get a noide light soon.
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Originally Posted by vjsimone
(Post 18579559)
With the key ON, you will have 12v dc to the Injectors.
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Originally Posted by Fordfarmer79
(Post 18579563)
Got ya, then I assume the computer grounds them?
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1 Attachment(s)
Originally Posted by vjsimone
(Post 18579585)
Correct, 4 at a time....
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Originally Posted by vjsimone
(Post 18579598)
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