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

Tiny
JIM.THOMPSON
  • MEMBER
  • 2006 LINCOLN LS
  • 3.9L
  • V8
  • RWD
  • AUTOMATIC
  • 120,000 MILES
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.
Saturday, September 24th, 2016 AT 5:14 AM

10 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Saturday, September 24th, 2016 AT 7:22 AM
Tiny
JIM.THOMPSON
  • MEMBER
  • 6 POSTS
Fuel pressure is 45psi.
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Friday, September 30th, 2016 AT 12:01 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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.
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Friday, September 30th, 2016 AT 12:18 PM
Tiny
JIM.THOMPSON
  • MEMBER
  • 6 POSTS
Fuel pressure drops from 45 to 30 psi in five minutes. Where is crankshaft positioning sensor located?
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Saturday, October 1st, 2016 AT 7:42 AM
Tiny
JIM.THOMPSON
  • MEMBER
  • 6 POSTS
I also scaned for code and there wasn't any.
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Saturday, October 1st, 2016 AT 7:46 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
See pic for crank sensor these can go bad and not send a code.
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Saturday, October 1st, 2016 AT 8:45 AM
Tiny
JIM.THOMPSON
  • MEMBER
  • 6 POSTS
I replaced the crankshaft sensor. But I still have the same problem.
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Monday, October 3rd, 2016 AT 5:14 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Fuel pressure shouldn't drop 15 ppsi in five minutes should be 10 or less check your regulator
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Monday, October 3rd, 2016 AT 6:27 AM
Tiny
JIM.THOMPSON
  • MEMBER
  • 6 POSTS
Is that with the engine running
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Monday, October 3rd, 2016 AT 8:25 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
No at shutdown if you rev engine fuel pressure going up will be normal but not by a lot.
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Monday, October 3rd, 2016 AT 9:18 AM

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