Hey All - was hoping to get some input on my Expedition. Drove it yesterday, and stopped on way home to pick up some items to fix a plumbing leak at my house, and when I came out it would crank but wouldn't start/fire. So I came home, got some tools and went back to do some testing. Here's the testing I did and results. Not sure if it matters, but it has 217k miles on it and it was running fine when I shut it off.
1. Went to back cargo area and hit the reset button on the inertia switch to ensure that wasn't causing the issue. Tried starting after that and no change - would crank fine (cranks as fast as it normally does when it starts) and no firing.
2. Tried to open the fuel tank door and remove cap to listen for fuel pump running - did this several times and couldn't hear it turn on.
3. Popped open passenger kickpanel and located the dark green/yellow wire (one I found was in a plug up near top of the fuse box). I backprobed that wire with my multimeter - when key was turned to "ON" position, I'd see the multimeter jump up to 11.25-11.5 volts, and it would only stay there for maybe a second and drop down (I think it dropped to zero but not recalling).
4. Opened the hood, located the schrader valve on the fuel rail, and tried to bleed it off. I didn't have a fuel pressure gauge, but I would hit the valve inside and wouldn't hear anything bleeding off. I was expecting it to be like a tire where you push the middle "valve" and you would hear the pressure being released. Also tried holding the valve open while turning car to on and still heard nothing coming out.
So any ideas on what to check or conclusions as to what the issue might be? I'm probably towing it to my mechanic today as its near impossible to diagnose effectively in the middle of a parking lot, and based upon the fuel pump relay test and no pressure at schrader valve I'm 99.9% confident this is fuel related, and I'm leaning towards it being a fuel pump, but really need to get it somewhere that it can be diagnosed correctly.
Also, not sure it matters but earlier this week (Monday I think) when I got gas, I started it up and the first time it would try to run and be idling near 400-500 RPMs, then it stalled out. I turned it off and restarted the car and it ran perfectly fine until Thursday morning when the no start condition struck.
Appreciate any insight or input you might have into the matter.
Thanks.
1. Went to back cargo area and hit the reset button on the inertia switch to ensure that wasn't causing the issue. Tried starting after that and no change - would crank fine (cranks as fast as it normally does when it starts) and no firing.
2. Tried to open the fuel tank door and remove cap to listen for fuel pump running - did this several times and couldn't hear it turn on.
3. Popped open passenger kickpanel and located the dark green/yellow wire (one I found was in a plug up near top of the fuse box). I backprobed that wire with my multimeter - when key was turned to "ON" position, I'd see the multimeter jump up to 11.25-11.5 volts, and it would only stay there for maybe a second and drop down (I think it dropped to zero but not recalling).
4. Opened the hood, located the schrader valve on the fuel rail, and tried to bleed it off. I didn't have a fuel pressure gauge, but I would hit the valve inside and wouldn't hear anything bleeding off. I was expecting it to be like a tire where you push the middle "valve" and you would hear the pressure being released. Also tried holding the valve open while turning car to on and still heard nothing coming out.
So any ideas on what to check or conclusions as to what the issue might be? I'm probably towing it to my mechanic today as its near impossible to diagnose effectively in the middle of a parking lot, and based upon the fuel pump relay test and no pressure at schrader valve I'm 99.9% confident this is fuel related, and I'm leaning towards it being a fuel pump, but really need to get it somewhere that it can be diagnosed correctly.
Also, not sure it matters but earlier this week (Monday I think) when I got gas, I started it up and the first time it would try to run and be idling near 400-500 RPMs, then it stalled out. I turned it off and restarted the car and it ran perfectly fine until Thursday morning when the no start condition struck.
Appreciate any insight or input you might have into the matter.
Thanks.