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Engine starts and then stalls in 5 seconds

Tiny
HARVEYNIEDRICH
  • MEMBER
  • 1999 BUICK REGAL
  • 3.8L
  • 6 CYL
  • TURBO
  • FWD
  • AUTOMATIC
  • 170,000 MILES
We replaced the fuel filter & the fuel pump & the fuel regulator, about a month ago part of the insturment panel quit lighting up, part of which is the security light, and now the remote start will not work just causes the lights to flash on and off, fuel pressure is good it comes up to 45lbs when it starts while its runs the pressure drops to 10 lbs and stalls then the pressure comes right back too 45lbs, the fuel relays were checked and seem to be good. One guy looked at it and he seemed to think it may be in the security system
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Saturday, January 9th, 2016 AT 11:51 AM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try a new key then have it scanned for codes for security system also check battery in key fob. If it's a 3.1L fuel pressure should be 41-47 psi if a 3.8L 48-55 psi check with a gauge auto parts rent it.
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Saturday, January 9th, 2016 AT 1:13 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
It's probably not the security system since that car uses the Passkey II system and that system also disables the starter when active.

Try this, disconnect the oil pressure switch and try to start it. Let me know what happens.
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Saturday, January 9th, 2016 AT 1:17 PM
Tiny
HARVEYNIEDRICH
  • MEMBER
  • 6 POSTS
I don't know where the oil pressure switch is located
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Saturday, January 9th, 2016 AT 3:02 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
It should be on the lower back side of the engine on the passenger side.
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Saturday, January 9th, 2016 AT 3:17 PM
Tiny
HARVEYNIEDRICH
  • MEMBER
  • 6 POSTS
Disconnected the oil pressure switch and tried to start, same as before starts and stalls in 5 seconds no different
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Sunday, January 10th, 2016 AT 10:32 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
OK, you will need to track down what is causing the fuel pressure to drop off like that.
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Sunday, January 10th, 2016 AT 11:05 AM

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