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1989 ford f150 loss of power

F 150 with 4.9 L straight 6 cylinder with 220k. Hard to start in morning having to give it lots of gas. Once warm runs good at idle. When shifting the rpm's must be above normal to keep it running. I slowly gets to speed, but loss of power.
Have changed fuel filter, wires, plugs, rotor, cap, oxygen sensor, fuel pumps ( as an external and internal) Had dual tanks and removed rear and runs exactly the same as before. Have put many heat and fuel injector cleaners through tank.
Help

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  • ROB May 11, 2010

    is the choke working ? could be worn accelerator pump diaghram or a leaking gasket sucking air & leaning out the mixture so tight everything & spray a liitle soapy water to see if iitt bubbles indicating air leak [not sealing!] whats the compression like?? is it getting hot [timing out] is it blowing smoke as that could be brocken or worn piston rings or burnt valves

  • Mike Butler
    Mike Butler May 11, 2010

    Have you ever had it scanned for fault codes? If yes, what were they?

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  • 64 Answers

1989 is fuel injected, on the intake there is idle air control valve, make sure this is not dirty, also you may want to check the coolant temperature sensor, if the engine thinks it is warmer then waht it is the fuel air ratio will be off and your truck will run bad.

Posted on Jul 22, 2009

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