So what would your guys' diagnosis be? I have tried figuring out a pattern, such as it will happen when its hot or cold, or been running for a while, or not, and such, but haven't seen any kind of a pattern at all. I talked with the guy at the auto parts store, and he says that would be the best route to go as well. However, I tried starting it today, and it starts up and runs just fine, so he says try replacing the fuel pump relay. I do that and no fuel comes out, so he says fuel pump. 2003 Ford Expedition 5.4LFuel Pump Relay R303 bypassThere is an ongoing issue with interior fuse block failure on these Expeditions. So my uncle tells me to pull the fuel line going into the filter, flip the key over and see if fuel comes out. Went to go to work the other day, and it just died.
So I replaced the entire ignition system, including spark plugs, wires, coil, coil wire, and distributor cap. So i think ignition problem, because we tested the coil wire, and it was getting no spark. I had previously had the problem of driving down the road, and all of a sudden there is no throttle response, the car revs down and dies.
Well, okay, maybe you can diagnose the problem.
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