1999 Pontiac Bonneville Starts, runs, stalls

Tiny
HARRYSTERKEL
  • MEMBER
  • 1999 PONTIAC BONNEVILLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 152,000 MILES
Hi, I have a 99 bonneville that we just replaced the fuel pump on because poor pressure. I don't think that created this problem tho. The car starts when cold and runs fine for a couple of minutes, then begins rough idle and stalls. When you try to restart it starts and dies. It will not run untill completely cold again. What could be the problem?
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Wednesday, July 9th, 2008 AT 3:40 PM

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Tiny
RASMATAZ
  • MEMBER
Confirm that the fuel pressure is within specs if okay Inspect and test the idle air control valve/coolant temperature/throttle position/MAF and MAP sensors

It will not run untill completely cold again. When it does this do below immediately and see what happens this will determine if its fuel or spark problem.

Do you have a check engine light On or flashing prior to this problem?

If the engine's condition is in tip top shape-do below to determine if its fuel or spark problem that's if its cranking over and refuses to start

Get a carb cleaner and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel problem, check the fuel pressure to rule out the fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil, distributor pick-up coil, ignition control module, cam and crank sensors-

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems with compression and valves opening and closing at the wrong time
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Wednesday, July 9th, 2008 AT 5:50 PM

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