2001 Expedition stopped running
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2001 Expedition stopped running
While driving, my Expedition suddenly quit running. I noticed a slight misfire in the days leading up to the failure. Suspecting a fuel pump (was just replaced 3 months ago), we changed the pump a second time. Vehicle still would not start. We then checked the fuel pump relay and 20 amp fuse. Both were OK. We checked the fuel inertia cutoff switch, also OK. And even jumpered a wire suspecting a bad wire, which supplied power directly to the pump. Still wouldn't start. Then we took off the air cleaner and dumped some fuel directly into the throttle body...whalla, the vehicle fired up for about 5 seconds. Now we know that no fuel is getting into the cylinders. Checked the fuel rail (even installed a new fuel regulator) at the schrader valve, depressed the pin and fuel came out. So, it appears the injectors are not opening up and allowing the fuel into the intake. Can anyone point to the next thing for me to check out? The EFI power supply relay? Is there one? Or, (worst case scenerio) the ECM? Thanks, any help would be appreciated.
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Yes I have...and the fuel regulator, etc. We checked the fuel and it is clean in the tank, but we put on a new strainer as well. Everything is pointing to the ECM and that is expensive. Unless there is something else?
Fleet Owner
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You should get yourself what's called a noid light and connect it to each of the injectors. This will tell you if the injectors are getting the pulses they need or not.
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From: Ocala FL
I've heard of the filter being partially obstructed and reducing the volume of fuel enough not to run even though the psi checks out good.
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Hotshot
Joined: Jan 2004
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From: St Louis
Add a fuel pressure tester to the list of equipment needed.
Look, you can guess all you want to and swap stuff out. You might get lucky. You will be called a "parts swapper". Or, you can invest in some hardware and actually diagnose it right the first time!
This circuit is not rocket science. Power is applied to the pump motor. The pump does its thing and pushes fuel up to the rail, creating pressure. The injectors are fired by the PCM to squirt a metered amount of fuel into each cylinder at the right time. The piston compresses that fuel/air mixture, the spark plug fires it off, and the explosion produces a moving piston that rotates on the crank.
If there's no fuel pressure at the rail, you need to learn why so you can accurately diagnose it. You can't know how much pressure is there without measuring it, therefore, a gauge is handy to have.
You can't accurately determine if the pump is being sent its power to be turned on unless you actually check for it. That's where the meter comes in.
Look, you can guess all you want to and swap stuff out. You might get lucky. You will be called a "parts swapper". Or, you can invest in some hardware and actually diagnose it right the first time!
This circuit is not rocket science. Power is applied to the pump motor. The pump does its thing and pushes fuel up to the rail, creating pressure. The injectors are fired by the PCM to squirt a metered amount of fuel into each cylinder at the right time. The piston compresses that fuel/air mixture, the spark plug fires it off, and the explosion produces a moving piston that rotates on the crank.
If there's no fuel pressure at the rail, you need to learn why so you can accurately diagnose it. You can't know how much pressure is there without measuring it, therefore, a gauge is handy to have.
You can't accurately determine if the pump is being sent its power to be turned on unless you actually check for it. That's where the meter comes in.
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Fleet Owner
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That's true, but in this case when the engine wouldn't start, pouring fuel directly into the intake caused it to fire up. This means no fuel is getting into the cylinders via the injectors, which in turn rules out a restriction that would allow a small amount of fuel to pass, such as a clogged filter.
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OK, just checked out the fuses, all ok. We have power at the harness leading to the tank. We have a brand new airtec pump installed. Didn't need the noid lights as we put the meter to it. NO pressure. So we had just residual fuel in the rail, but no pressure. We are going to drop the tank, again, and pull out the pump assembly. Put power directly to it and check. I have a suspicion now that the connectors on the assembly itself (where we put in just the new pump motor) are not making contact....or the tank harness is bad. Once out we'll put the meter to it and check for continuity. That should tell the story.