Mechanics

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

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.
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Richard Neumann
December 1, 2011.




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

Tiny
Rasmataz
Dec 1, 2011.
It starts right back up without a problem.

Tiny
Richard Neumann
Dec 1, 2011.
Check the fuel pressure fuel pump could be failing when it heats up it breaks-then it repeats when cool for a bit-

Tiny
Rasmataz
Dec 1, 2011.
Will try will let you know if it works thanks
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Tiny
Richard Neumann
Dec 1, 2011.
Any word on this yet Richard? If not, try checking fuel pressure and spark when the problem occurs.

Rivermikerat
Dec 5, 2011.
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?

Tiny
Richard Neumann
Dec 5, 2011.
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.

Rivermikerat
Dec 5, 2011.

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