On my 2003 Grand Prix GT when I start it, the idle jumps up and down and it acts like it wants to die but after a few minutes its fine. Theres a loud suction noise during that process then it goes away. Also sometimes it will not change gears till about 3,000rpm. Other times it runs fine. I'm assuming its a sensor. Any suggestions on what it might

Kimberly Moran

• 4 Answers
• Posted on Oct 22, 2008

SOURCE: Crank shaft Sensor

After replacement of crankshaft position sensor, the computer needs to have the crankshaft position system variation learn procdeure performed. That requires a factory scan tool. Crankshaft Position Sensor Replacement Removal Procedure

1. Disconnect the negative battery cable.Raise and support the vehicle. .
2. Remove the crankshaft harmonic balancer. Disconnect the crankshaft position (CKP) sensor electrical connector.
3. Remove the CKP sensor shield (1). DO NOT use a pry bar.
   
   
   
4. Remove the CKP sensor studs.
5. Remove the CKP sensor.

1. Install the CKP sensor. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
   
2. Install the CKP sensor studs. Tighten
   Tighten the studs to 30 N·m (22 lb ft).
   
   
   

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

SOURCE: I have a 2004 grand prix gt and sometimes on start it stalls

Take your car to a dealer and tell them to "clean the throttle body" Known problem for this year. It will solve your issue.

Harvey N Tawatao

• 3854 Answers
• Posted on Mar 09, 2010

SOURCE: Pontiac Grand Prix GT grinding and whining noise when turning...

If you have a warranty from your dealer, you paid for it, or whether it came with it, it doesn't matter, you MAKE them honor it. Take it back there, and MAKE THEM FIX IT! This shouldn't be your problem if you have a warranty. If they aren't honoring it, threaten them with the BBB or court. They will shape up.
I would say power steering pump.First check to make sure there is fluid in the reserve tank and at the proper level if not top it off and whine should stop.If level is correct then maybe try flushing with fresh fluid.
3.8L engine the power steering fluid was never toped/checked.. because it is a pain in the *** to get at (behind the hot as hell alternator), so it probably ran dry, top it up is probably all you have to do.. if the whining presists then you will have to try and bleed the air out by jacking it up, engine off, turn the wheel one side to the other about 25 times.. if that dont quiet it up then you will have to replace the power steering pump.


Power steering pump / fluid level is not hard to check - it is located below the alternator on the passenger side of the engine bay. You need a light to see it. You can get your hand down from the top of the engine to loosen and remove the cap/dipstick.
Here is a link that should help you.http://www.paulstravelpictures.com/GM-Pontiac-Grand-Prix-GTP-Power-Steering-Whine/index.html
Good luck and thank you for using Fixya

SOURCE: 2003 Pontiac Gran Prix GT 3.8L Thermostat replacement

Yes. Remove the housing (not the hose) and you'll find the thermostat.