CAR WILL STAY RUNNING FOR ABOUT 10 MINUTES AND THEN DIE.

  • Tiny
  • Richard Neumann
  • 1999 Pontiac Bonneville
  • 13,200 miles

Car will stay running for about 10 minutes then die, we have replaced the fuel sock, fuel pump, fuel filter, fuel pressure regulator, fuel pump relay, idle air value, crank shaft sensor, egr value, throttle positioning sensor, and map air flow sensor. Car was running fine until this happen. Check engine light is not on. Only code that comes up is random miss fire. Vehicle is a late 1999 model. Sometimes will come up as a 2000. Any help or suggestions would be wonderful.

Thursday, December 1st, 2011 AT 8:21 PM

7 Answers

  • Tiny
  • rasmataz
  • Member

Does it start back up without a problem or is it refusing at times-

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Thursday, December 1st, 2011 AT 8:34 PM
  • Tiny
  • Richard Neumann
  • Member

It starts right back up without a problem.

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Thursday, December 1st, 2011 AT 8:46 PM
  • Tiny
  • rasmataz
  • Member

Check the fuel pressure fuel pump could be failing when it heats up it breaks-then it repeats when cool for a bit-

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Thursday, December 1st, 2011 AT 9:06 PM
  • Tiny
  • Richard Neumann
  • Member

Will try will let you know if it works thanks

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Thursday, December 1st, 2011 AT 9:30 PM
  • Tiny
  • rivermikerat
  • Expert
  • 6,118 posts

Any word on this yet Richard? If not, try checking fuel pressure and spark when the problem occurs.

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Monday, December 5th, 2011 AT 1:16 AM
  • Tiny
  • Richard Neumann
  • Member

With fuel pressure gauge tester, pressure was about 42, but when I tap on mass air flow sensor car died right away. Think car has about two problems. Maybe fuel injectors?

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Monday, December 5th, 2011 AT 4:40 AM
  • Tiny
  • rivermikerat
  • Expert
  • 6,118 posts

It sounds like either the mass airflow sensor is either faulty or improperly plugged in(loose wires or connectors).

42 PSI sounds like it's in the ballpark.

Check the wiring from the coil(s) to the ECU and grounds.

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Monday, December 5th, 2011 AT 5:16 AM

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