2000 Pontiac Grand Prix 3.8L V6.
GM Computer codes = Manifold Absolute Pressure ( AKA MAP ). Crank & Cam Position Sensors, Ignition Module, Plugs replaced, checked fuses.
question = I have a 2000 Pontiac Grand Prix. About a week ago my car started shutting off when I was driving. Just like as if I turned the key off.
Now the only way I can get it to start and run is to hold the gas pedal to the floor. But as soon as I take my foot off the gas, it dies. What could be causing this? HELP!!
Answer: The MAP sensor or wiring to it could be the cause of it not staying running unless foot on the gas, but that would not explain the reason it stalled as if you shut of the key. Also, a missing PCV valve or O' ring if there was any work just prior to this problem done on the intake manifold.
The car just shutting off could be any loose connection under the hood, or a possible ignition switch. the ignition switch feeds power to many of the cars systems.
The 2 problems could also be related to a bad computer. Pull on the under hood engine wiring harness to see if you can get something to act up, then diagnose the MAP code next.
Starts And Stalls A Lot
2001 Pontiac Grand Prix 3800.
This car starts on the second try a lot. Stalls a lot when turning corners and braking down at lights Can it be fuel pump? going on for over a year.
This problem could be low fuel pressure caused by a failing pump, or a plugged filter. You also may have a problem with the Idle Air Control (IAC) motor. The motor could be bad, or full of carbon- as well as carbon in the throttle body bore and plate. Would suggest cleaning these items. See this how to video for cleaning carbon from the throttle. Then remove the IAC and clean it.
You could also have a leaking fuel pressure regulator (FPR). When they fail, fuel leaks into its vacuum line and causes a rich condition, also know as the engine being flooded. This will cause hard starting and stalling. Just remove the vacuum line after the engine has been running for a few minutes, then has been off for a few minutes. If it is bad, there will be fuel in the line.