Will not start will crank good

2004 FORD EXPEDITION
269,627 MILES • 5.4L • V8 • 2WD • AUTOMATIC
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WENDELL TARRANT
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  • 3 POSTS
The low oil pressure light came on, stayed on, then it started not getting fuel off and on. Then after I drove it to town it would not start any more, The on board computer sit has low oil pressure,I then checked the oil pressure with a manual gauge, read no oil pressure. I did check oil and for leaks no problems. I have replaced the oil pump, timing chain set, now it has 52 lbs of oil pressure, it still won't start, cranks, no start. The low oil pressure light is still on, I have tried clearing codes and computer,still won't start. What else can I do?
Mar 3, 2020 at 2:38 AM
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STEVE W.
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With the oil light on the PCM will not activate the fuel pump as it sees the lack of oil pressure through the instrument cluster and shuts it off to hopefully save the engine. This system piggybacks on the same system as the anti-theft unit uses to shut down the engine. I would change out the oil pressure switch and check that the wiring to it is good. With it working the light should go off as soon as oil pressure trips the switch.
Mar 3, 2020 at 4:30 AM
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WENDELL TARRANT
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  • 3 POSTS
I have put in a new oil sending unit and oil pump now I have 52 lbs of oil pressure, but it is not getting fuel to start.
Mar 4, 2020 at 2:47 AM
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STRAILER
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Does the engine sound normal when cranking over? Can you please shoot a quick video with your phone so we can hear the noise? that would be great. You can upload it here with your response. That way we can see if the engine is okay before we continue.
Mar 4, 2020 at 2:48 AM
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STEVE W.
  • ✓Experienced Mechanic
  • 15,411 POSTS
Is the low oil light going off? If not there is likely a wiring problem. If it is but you are not getting fuel try spraying a bit of starting fluid into the intake to see if you have spark.
Mar 4, 2020 at 4:00 AM
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