Question about 1989 Ford F 350

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1989 F 350 crew cab, 2 tanks, gasoline, 351 windsor motor, auto tranny. 52k original miles..... truck will start and run PERFECT for 10 mins or so. soon as it is warm it starts cutting out. no power and cant press the gas or it will try to die. occasionally ( 1/5 starts) this will happen right at the start even when cold.premium gas.. no additives... if the gas pedal is pressed there will be a popping noise in the intake.. almost sounds like a backfire. feathering the pedal will get the rpms up a little but still not driveable. new exhaust 10k miles ago.. welded except at catalytic converter.. converter not clogged.. checked that today. all vacuum hoses present and attached and complete pollution system still there also. new parts since this started include ignitiojn control module( which did test bad) ignition switch, ignition lock cylinder, distributor cap, rotor, wires and plugs, ignition coil, O2 sensor, air intake charge temp sensor and all filters are new and fluids are fine. new oil, air and fuel filters. checked the intake and EGR valves and both are clean and working. all fuses checked multiple times. tank selector switch is working to the best of my knowledge. it reads different for the 2 tanks but im assuming that means its actually pullng gas from the tank it says. only odd thing is when it cuts off i can check the fuel rail and if i depress the pressure valve there i get almost as much air as i do gas out of it. dont know if that means anything. any help would be appreciated since im stumped. truck ran FINE when i bought it and this did not start until after the first tune up. the sooner the better since i need this truck on the road working. it needs to make its money back.

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Maybe it's the timing chain,turn the crank with a socket untill #1 cylinder is at top dead center,pull off the distributer cap and check which plug wire is the rotor is at.if it's not #1 cylinder's plug wire,the timing chain has jumped.

Posted on Mar 17, 2011


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