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Old 12-13-2009, 14:46   #1 (permalink)
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1989 4x4 5.0 with miss

the truck has been missing for awile now. new plugs wires ca rotor fuel filter. don't know if its a fuel injector or something else. missing when cranked up and gets worse as soon as you start giving the gas. truck is also a 4spd.
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Old 12-13-2009, 17:24   #2 (permalink)
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Re: 1989 4x4 5.0 with miss

Being that it is a 89 you can buy the obd 1 ford code reader at auto zone or somewhere like that for around 30 bucks or so it not reads codes but will do a few different test one of which is a balance test where it goes through cutting each injector off for a few secounds and it monitors the rmp drop. after the test has completed it will tell you which cylinder is not pulling its load. that will put you to the exact cylinder that has a fault. once you know that you can start trouble shooting from there. I had a burnt valvle once in a 351 modified it would skip at idle but smoothed out as rpms went up. so I would almost rule that out you could run a compression check on it though but you could listen to that injector with motor running and compare the sound of it to the other injectors. a automotive stethoscope is the best way but a long screw driver handle pressed against your ear and touching the injectors with the metal tip may let you hear it. they make a loud clicking noise that gets faster with rpm when they're working up and down but it could be doing this and still just be clogged anyway theres a start hope this helps
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Old 12-17-2009, 10:13   #3 (permalink)
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Re: 1989 4x4 5.0 with miss

noticed yesterday that the exhaust has a strong fuel smell to it. maybe there is an injector putting to much fuel in. checked fuel pressure and regulator and thats ok. i had a 95 that had a broke valve spring that kinda did same thing. but its progressively getting worse.
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Old 12-18-2009, 21:53   #4 (permalink)
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Re: 1989 4x4 5.0 with miss

Digital numeric display/$20/ship same day.Equus Innova 3145 OBD-I Ford Scan Tool In order for it to do a cylinder balance test, your engine has to be MAF/SFI. Alas, your engine is MAP/EFI. The transition year was 94'. But you need to run the Error Code scans anyway. Probably the best $20. you ever spent (except that time in Mexico!) You could have poorly atomizing injectors (Lucas injector cleaner). 302's are notorious also to miss when wires are not ran correctly. See this link for proper routing: Ford Fuel Injection » TroubleShooting EFI Problems A can of Seafoam 2/3 through the power brake booster Vac hose, at normal op.temp. & idleing, shut off for 15 minutes, then blow out by revving till the smoke clears. The other 1/3 in the tank (Always helps idle). I also suspect maybe poor EGR flow, you need to run Error code scans to help I.D. for sure because that doesn't mean the valve itself is the problem. Buy the Code reader before you start buying a bunch of parts you don't need!
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