1999 Pontiac grand prix gtp rough idle dies when given excessive gas

Ronny Bennett Sr.

• 6988 Answers
• Posted on Jul 13, 2010

SOURCE: 1999 pontiac grand prix gtp dual airconditioning

Two things can be the problem,first,try adding ,a little freon,if it is low,it will only cool one side,then if this does not help,there is a door actuator motor that controls this,it could be not working,the dash has to come out to replace this actuator motor,if this was at all helpful,please rate,thank you.

SOURCE: 97 grand prix gtp starts then immediatly dies

If you have a GTP these engines use a hi output fuel pump. they use a fuel pump resistor located under the battery tray (look up from under the car) This resistor lowers the voltage to the fuel fump when not in boost mode. because of its locatoin it is prone to corrosion. if you bypass the wires and the engine starts and stays running replace the resistor

Greg Bernett

• 2993 Answers
• Posted on Jun 30, 2009

SOURCE: Where is the egr valve on a 1999 pontiac grand

Front of the motor....


Looks like this:

Shannon L Washam

• 169 Answers
• Posted on Sep 25, 2009

SOURCE: my car starts but after a while dies waht can be

Hello! You're symptoms sound very much like a common problem associated with the fuel pump resistor. The GTP engine has a two speed fuel pump. There are two relays that control the fuel pump via the PCM module. The fuel pump relay and fuel pump hi-speed relay. Tied into the hi-speed relay is a fuel pump resistor that may go bad.

Symptoms vary but primarily the engine will start but die in a matter of seconds due to insufficient fuel pressure.

Here is a picture of the relay - which is located in the fuse box in the engine compartment:


What you can do to both diagnose this and either narrow it down to this or disqualify it as the culprit is remove relay #15, and bend out the tab labeled "85", and then reinstall the relay. If this does solve your problem, then you need to replace the Fuel Pump Resistor. Doing this will bypass the resistor, and place the fuel pump in "high" speed mode at all times. Once you have replaced the resistor, you need to bend the tab back to its normal position and replace the relay.
NOTE: while this may be a helpful diagnosis tool, and provide a temporary fix - doing this procedure for a prolonged period of time can lead to fuel pump failure. Use this at your own risk.


Hope this helps and good luck!

SOURCE: I need to specifically know

Not sure what year your car is but on 2004's the low side is low behind the engine on the pax side. Near the alternator.