Question about 1990 Ford F250

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I have a 1990 ford f250 4x4 with a 5.8l i have replaced the fuel pump, i have replaced the computer, i have set the ignition timing i have cleaned the spark plugs and replaced the spark plug wires i have put a new timing chain in and still this piece of **** dont run right???

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I guess because it isn't playing nice. I would do a compression test first. Check that the cylinders are within limits. Would you explain what the drive-ability issue is? How does it idle? How does it run cold or hot?

Posted on May 05, 2010


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Both fuel pumps are not responding when trying to start truck

I'm not a qualified Ford tech but if I remember right, those vehicles won't power the fuel pumps until after the computer sees signal from the distributor.
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What would cause my 1990 f250 to lose spark, power to fuel pumps and also power to fuel tank selector switch

One thing that would affect spark and fuel pump power is the EEC relay.
I would start with checking that.
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We are having similar problems. My husband replaced the fuel pump, fuel regulator and now it cranks but dies when you give it a lot of gas. He thinks the fuel injectors are stopped up. I read where one guy replaced the computer and fixed it and another one replaced the EEC. Check the relay contact and clean and check all grounding wires.

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