Question about 2005 Pontiac Grand Prix
If the car has a remote start installed, that may be the problem. My wife's car, a Ford, equiped with remote start shuts off automatically after 4 minutes if key is not inserted into ignition switch. I've been advised that the 4 minute shut-off can be adjusted to increase or decrease the run time. If your car has remote start try disabling it.
If no remote, I'd suspect the OBC is mistakenly sending a shut-down code after a few seconds then resetting itself and not sending the signal when you restart. You probably have the repair manual for the car and that should detail the shutdown sequence and how to reset. Wouldn't be great if we still had engines like 283s, 287s, 327s and my all time favorites 396s and 440s
Posted on Nov 10, 2010
OK, you'll need to purchase an OBD-II Scanner which handles 1996 and above vehicles up to 2005 or so. Actron makes a good unit and you can purchase an OBD-II Scanner for under $100 at Sears and Walmart if you want to do it yourself.
Otherwise, you could try Autozone or Advance Auto Parts which will scan your car's computer for free in many cases.
Many scanners have English explanations as to what might be causing the problem, along with the alphanumeric code.
The fuel filters in later model cars such as yours generally don't plug up that quickly due to later anti-corrosion treatments for gas tanks.
The fuel pressure you read seems to be ok.
Do you see a 'service engine soon' light on the dashboard, at all?
Good luck on this repair.
Posted on Nov 08, 2010
Have you ran a diagnostics? What codes did it have, if any. If you are not getting any codes, then it is going to fuel related. If the car is getting codes let me know what they are, and we will see if we can't figure out what the problem is. If there are no codes. I would start by checking fuel pressure. If the fuel pressure is good, have you considered having bad gas?
Posted on Nov 09, 2010
If it will start and run for hours, this is the relearn that the computer does. I'll bet if you begin to use the vehicle daily, the problem will seise to exist. As the battery voltage drops on the newer vehicles, it can mess with the ECM/PCM. Charge the battery in full, and go for a drive. Let me know how it does. Sorry to hear about the illness of your wife. Wishes for a speedy recovery.
Posted on Nov 08, 2010
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Posted on Jan 02, 2017
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