after it gets warmed up, it will crank over several times before starting

2006 LINCOLN LS
120,000 MILES • 3.9L • V8 • RWD • AUTOMATIC
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JIM.THOMPSON
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Car starts right up in in mornings. But if it sets for a couple of hours after it gets warmed up, it will crank over several times before starting.
Sep 24, 2016 at 5:14 AM
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HMAC300
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check fuel pressure with a gauge auto parts rent it.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Sep 24, 2016 at 7:22 AM
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JIM.THOMPSON
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Fuel pressure is 45psi.
Sep 30, 2016 at 12:01 PM
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HMAC300
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pressure is ok test to see if it holds preossure for at least 5 minutes if not it may be a bad regulator otherwise scan for codes and check crank sensor.
Sep 30, 2016 at 12:18 PM
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JIM.THOMPSON
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Fuel pressure drops from 45 to 30 psi in five minutes. Where is crankshaft positioning sensor located?
Oct 1, 2016 at 7:42 AM
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JIM.THOMPSON
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I also scaned for code and there wasn't any.
Oct 1, 2016 at 7:46 AM
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HMAC300
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see pic for crank sensor these can go bad and not send a code.
Image (Click to enlarge)
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Oct 1, 2016 at 8:45 AM
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JIM.THOMPSON
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I replaced the crankshaft sensor. But I still have the same problem.
Oct 3, 2016 at 5:14 AM
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HMAC300
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fuel pressure shouldn't drop 15 ppsi in five minutes should be 10 or less check your regulator
Oct 3, 2016 at 6:27 AM
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JIM.THOMPSON
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Is that with the engine running
Oct 3, 2016 at 8:25 AM
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HMAC300
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no at shutdown if you rev engine fuel pressure going up will be normal but not by a lot.
Oct 3, 2016 at 9:18 AM